{"title":"Exhaust Manifolds \u0026 Gaskets","description":null,"products":[{"product_id":"sierra-18-0102-water-passage-cover-gasket-replaces-omc-322858-for-johnson-evinrude-outboard-motors","title":"Sierra Inner Exhaust Cover Gasket 18-0102, Replaces OMC 326264, for Johnson\/Evinrude Outboard Motors","description":"\u003cp\u003eThe Sierra 18-0102 is an inner exhaust cover gasket built for Johnson and Evinrude outboard motors. It seals the inner exhaust cover against the powerhead, preventing exhaust leaks and maintaining proper cooling water and exhaust routing through the outboard's exhaust housing. This gasket is a direct replacement for OMC part number 326264, letting you restore a factory-tight seal without sourcing the original OMC part.\u003c\/p\u003e\u003cp\u003eThe gasket is finished in white and is sold individually (package quantity of 1), so you can order exactly the quantity your job requires. It is manufactured in the United States and carries Sierra's limited warranty. As with any exhaust or cover gasket, this is a wear item that should be replaced any time the inner exhaust cover is removed, since reusing an old gasket risks an incomplete seal and exhaust or water leakage.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0102\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Inner Exhaust Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 326264\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999750853\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e United States\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Outboard Brands:\u003c\/strong\u003e Johnson, Evinrude\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Johnson and Evinrude outboard motors.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003e326264\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0102 gasket fit?\u003c\/strong\u003e The Sierra 18-0102 inner exhaust cover gasket is designed to fit Johnson and Evinrude outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-0102 replace?\u003c\/strong\u003e Sierra 18-0102 replaces OMC part number 326264, so it can be used as a direct substitute for that original equipment gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e Each package of the Sierra 18-0102 contains a single gasket (package quantity of 1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0102 gasket weigh?\u003c\/strong\u003e It weighs 0.1 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-0102 gasket?\u003c\/strong\u003e This gasket is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-0102 gasket made?\u003c\/strong\u003e It is manufactured in the United States.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0102 an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra aftermarket gasket manufactured to replace OMC part number 326264, not an original OMC-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere on the outboard is this gasket installed?\u003c\/strong\u003e The 18-0102 is an inner exhaust cover gasket, used to seal the inner exhaust cover on Johnson and Evinrude outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I reuse my old exhaust cover gasket when servicing the outboard?\u003c\/strong\u003e No. Once the inner exhaust cover is removed, the old gasket should be replaced with a new Sierra 18-0102 to maintain a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0102 come with a warranty?\u003c\/strong\u003e Yes, it is covered by Sierra's limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988012806363,"sku":"SIE-18-0102","price":10.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0102_lg__45622.1558119955.500.750.jpg?v=1785188774"},{"product_id":"sierra-18-2849-exhaust-elbow-gasket-for-mercruiser-center-rise-manifolds-available-single-or-pack-of-2","title":"Sierra Exhaust Elbow Gasket 18-2849 for Mercruiser Exhaust Manifolds - Available Single or Pack of 2","description":"\u003cp\u003eThe Sierra 18-2849 Exhaust Elbow Gasket is an open-style gasket that seals the connection between the exhaust manifold and the exhaust manifold elbow on applicable Mercruiser stern drive installations. It is designed to fit the 18-1957-2 exhaust manifold (used on GM Big Block V8 454 cu. In. Applications, Models 330, 340 \u0026amp; 7.4L) and mates with the 18-1970-2 (3 inch hose), 18-1976-2 (4 inch hose, 7 degree down angle), and 18-1974-1 (3 inch hose, 15 degree down angle) manifold elbows. The gasket is constructed from a stainless steel infused graphite material engineered for superior compressibility, giving it a reliable seal against exhaust gas and cooling water leakage at the manifold-to-elbow joint. Its round, open-flow design matches the factory port profile so exhaust and water flow are not restricted.\u003c\/p\u003e\u003cp\u003eThis gasket is a routine maintenance and repair item, typically replaced any time the exhaust elbow is removed for service, inspection, or corrosion, or as part of a preventive maintenance schedule to avoid gasket failure and coolant intrusion. It is available as a single gasket or in a package of 2, so owners replacing elbows on both sides of the engine, or keeping a spare on hand, can order the quantity that matches the job.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2849\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Elbow Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Open\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-818832\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Manifold:\u003c\/strong\u003e 18-1957-2 (GM Big Block V8 454 cu. In., Models 330, 340 \u0026amp; 7.4L)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Elbows:\u003c\/strong\u003e 18-1970-2 (3 inch hose), 18-1976-2 (4 inch hose, 7 degree down angle), 18-1974-1 (3 inch hose, 15 degree down angle)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless steel infused graphite\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging Options:\u003c\/strong\u003e Single or pack of 2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSizes \u0026amp; Options\u003c\/h3\u003e\u003cp\u003eThis gasket is sold two ways: as a single gasket, or as a package of 2. Choose the single option if you are replacing one elbow gasket, or the pack of 2 if you are servicing elbows on both sides of the engine or want a spare on hand. Both options are the identical open-style gasket fitting the 18-1957-2 manifold and its matching 18-1970-2, 18-1976-2, and 18-1974-1 elbows; only the quantity in the package differs.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2849 exhaust elbow gasket fit?\u003c\/strong\u003e The 18-2849 gasket fits the 18-1957-2 exhaust manifold and seals it to the 18-1970-2, 18-1976-2, or 18-1974-1 manifold elbows.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket sold as a single piece or in a pack?\u003c\/strong\u003e The Sierra 18-2849 gasket is available either as a single gasket or as a package of 2, so you can order the exact quantity needed for a one-side or two-side elbow replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the OEM cross reference number for this gasket?\u003c\/strong\u003e The 18-2849 gasket cross references to Mercruiser\/Mercury number 27-818832.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the exhaust elbow gasket made from?\u003c\/strong\u003e It is made from a stainless steel infused graphite material, chosen for its compressibility and ability to hold a reliable seal at the exhaust elbow joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an open or blocked style gasket?\u003c\/strong\u003e This is the open-style elbow gasket (18-2849), which matches manifolds using the open exhaust port configuration, as opposed to a blocked-style gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich manifold elbows use this gasket?\u003c\/strong\u003e The 18-2849 gasket is used with the 18-1970-2 elbow (3 inch hose), the 18-1976-2 elbow (4 inch hose, 7 degree down angle), and the 18-1974-1 elbow (3 inch hose, 15 degree down angle).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the single gasket or the pack of 2?\u003c\/strong\u003e If you are only replacing one exhaust elbow, order the single 18-2849 gasket; if you are servicing elbows on both sides of the engine or want a spare in reserve, order the pack of 2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the gasket and what shape is it?\u003c\/strong\u003e The Sierra exhaust elbow gasket is black and round in shape, matching the factory open exhaust port profile.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket work with the 18-1957-2 manifold?\u003c\/strong\u003e Yes, the 18-2849 gasket is designed to fit the 18-1957-2 exhaust manifold, which is used on GM Big Block V8 454 cu. In. Applications, Models 330, 340 and 7.4L.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any other gaskets or hardware with this part?\u003c\/strong\u003e The 18-2849 elbow gasket seals the manifold-to-elbow joint only; the corresponding manifold gasket and mounting hardware for the 18-1957-2 manifold are separate parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2849 gasket genuine Sierra or aftermarket?\u003c\/strong\u003e It is a Sierra-branded exhaust elbow gasket, sold under Sierra part number 18-2849, and is backed by Sierra.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Single","offer_id":48988029059291,"sku":"SIE-18-2849-1","price":10.8,"currency_code":"USD","in_stock":false},{"title":"Pack of 2","offer_id":48988029092059,"sku":"SIE-18-2849-9-1","price":21.57,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2849-1__33114.1722491711.500.750.jpg?v=1785188455"},{"product_id":"sierra-18-0183-1-exhaust-manifold-gasket-for-crusader-marine-engines-riser-18-1938-manifold-oem-98243","title":"Sierra Manifold Gasket 18-0183-1, Replaces 27-73866, for Exhaust Manifolds 18-1958-1 \u0026 18-1962-1","description":"\u003cp\u003eThe Sierra 18-0183-1 is a manifold gasket engineered to seal the connection between the exhaust manifold and the engine block on applicable inboard and sterndrive setups. It is designed for use with Sierra exhaust manifolds 18-1958-1 and 18-1962-1, and it is also included as a component in the Sierra 18-8509 mounting kit for buyers who need the full mounting hardware set rather than the gasket alone. A proper manifold gasket is a critical wear item: it maintains the seal against combustion gases, exhaust backpressure, and cooling water routed through the manifold passages, and a worn or failed gasket is a common cause of exhaust leaks, water intrusion, or gasket-related corrosion around the manifold mounting surface. Replacing this gasket whenever the manifold is removed, serviced, or reinstalled helps ensure a proper seal and prevents having to redo the job due to a compromised old gasket. This part cross-references directly to OEM number 27-73866, so it is a straightforward drop-in replacement for that OEM gasket. At 0.2 pounds, it ships and installs easily alongside routine manifold maintenance or a full manifold replacement.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0183-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e Manifolds 18-1958-1, 18-1962-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso Included In:\u003c\/strong\u003e 18-8509 mounting kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 27-73866\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUse with exhaust manifold 18-1958-1\u003c\/li\u003e\n\u003cli\u003eUse with exhaust manifold 18-1962-1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-73866\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0183-1 gasket fit?\u003c\/strong\u003e The 18-0183-1 manifold gasket is designed for use with exhaust manifolds 18-1958-1 and 18-1962-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0183-1 the same as OEM part 27-73866?\u003c\/strong\u003e Yes, the Sierra 18-0183-1 gasket cross-references directly to OEM number 27-73866, making it a direct replacement for that part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The 18-0183-1 manifold gasket weighs 0.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket come with the mounting kit?\u003c\/strong\u003e It is included as a component of the 18-8509 mounting kit, and it is also sold separately as the standalone 18-0183-1 gasket for buyers who only need the gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill I need more than one gasket for a manifold job?\u003c\/strong\u003e That depends on your manifold configuration; check whether your installation uses one or two manifolds, since each 18-1958-1 or 18-1962-1 manifold requires its own 18-0183-1 gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse my old manifold gasket instead of replacing it?\u003c\/strong\u003e Manifold gaskets like the 18-0183-1 are designed as one-time-use sealing components, and reusing a compressed or damaged gasket increases the risk of exhaust or water leaks at the manifold joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-8509 mounting kit?\u003c\/strong\u003e The 18-8509 mounting kit includes the 18-0183-1 manifold gasket along with mounting bolts for installing the manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0183-1 gasket for the manifold-to-block connection?\u003c\/strong\u003e Yes, this gasket seals the exhaust manifold at its mounting point for manifolds 18-1958-1 and 18-1962-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM number should I search for if I only have the old part in hand?\u003c\/strong\u003e Look for OEM number 27-73866; the Sierra 18-0183-1 gasket is the direct replacement for that number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need special tools to install this gasket?\u003c\/strong\u003e Installation follows standard manifold gasket procedure: remove the old gasket, clean the mating surfaces, and torque the manifold bolts to the engine manufacturer's specification with the new 18-0183-1 gasket in place.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988031320283,"sku":"SIE-18-0183-1","price":13.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0183_lg__27751.1558118728.500.750.jpg?v=1785329169"},{"product_id":"sierra-18-0418-exhaust-manifold-mounting-gasket-replaces-mercruiser-27-46820-gm-3852472-fits-454-cu-in-gm-big-block-v8","title":"Sierra 18-0418 Exhaust Manifold Mounting Gasket, Replaces Crusader 96653, for Manifold 18-1898","description":"\u003cp\u003eThe Sierra 18-0418 is an exhaust manifold mounting gasket engineered to seal the connection between the exhaust manifold and engine block on applicable inboard\/sterndrive setups. It is built to meet or exceed the quality of the original equipment part it replaces, giving installers a reliable seal that resists the heat and combustion byproducts present at the manifold mounting joint. This gasket is designed for use with Manifold 18-1898, so it is a direct fit when servicing or replacing that manifold assembly.\u003c\/p\u003e\u003cp\u003eAs a mounting gasket, its job is straightforward but critical: maintain a tight, leak-free seal at a high-heat, high-vibration joint so exhaust gases and cooling water stay contained within the manifold system. Sierra manufactures this part to original-equipment specifications, making it a straightforward drop-in replacement for the OEM gasket it supersedes. At 0.23 pounds, it ships as a single-count gasket ready to install during routine manifold service, gasket replacement, or a full exhaust system rebuild.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0418\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Exhaust Manifold Mounting Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.23 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e white\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282257361\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse With Manifold:\u003c\/strong\u003e 18-1898\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eUse with Manifold: 18-1898\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eCrusader 96653\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0418 used for?\u003c\/strong\u003e The Sierra 18-0418 is an exhaust manifold mounting gasket that seals the joint where the exhaust manifold mounts, and it is designed for use with Manifold 18-1898.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0418 gasket fit manifold 18-1898?\u003c\/strong\u003e Yes, the Sierra 18-0418 mounting gasket is specified for use with Manifold 18-1898.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-0418 replace?\u003c\/strong\u003e It replaces Crusader part number 96653.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0418 gasket weigh?\u003c\/strong\u003e 0.23 pounds, per unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0418 gasket?\u003c\/strong\u003e White is the color of this gasket as supplied by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one Sierra 18-0418 package?\u003c\/strong\u003e One gasket is included per unit count of the Sierra 18-0418 package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0418 an OEM or aftermarket gasket?\u003c\/strong\u003e It is an aftermarket gasket manufactured by Sierra to meet or exceed the quality of the original equipment part it replaces, specifically Crusader 96653.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0418?\u003c\/strong\u003e The UPC is 808282257361.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-0418 be used as a direct replacement without modification?\u003c\/strong\u003e Yes, since it is manufactured to meet or exceed original equipment specifications for the Crusader 96653 gasket it replaces, it installs as a direct replacement with Manifold 18-1898.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0418 gasket sold individually?\u003c\/strong\u003e Yes, it is sold as a single gasket, with a unit count of one.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988074148059,"sku":"SIE-18-0418","price":16.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0418_lg__74798.1558118370.500.750.jpg?v=1785188088"},{"product_id":"exhaust-manifold-gasket-set-for-ford-302-351-cid-marine-engines-replaces-glm-39920-sierra-18-0603","title":"Sierra 18-0603 Exhaust Manifold Gasket Set, Ford 302-351 CID Engines, Replaces GLM 39920","description":"\u003cp\u003eThe Sierra 18-0603 Exhaust Manifold Gasket Set supplies the gaskets needed to properly seal the exhaust manifold on Ford 302-351 CID marine engines when installing or servicing a Sierra 18-1998-1 exhaust manifold. The set includes two exhaust manifold gaskets (18-0183-1) plus exhaust elbow gaskets, giving you a complete matched pair for a two-side installation rather than having to source individual gaskets separately. Each gasket is built to seal reliably against the heat and vibration of marine exhaust manifold service, helping prevent exhaust leaks and coolant seepage at the manifold joint on a closed cooling system setup. Sierra states that this gasket set is manufactured to meet or exceed the specifications of the original equipment part it replaces, making it a straightforward equivalent when the OEM gasket is worn, hardened, or no longer sealing correctly. The set is packaged as a single kit under Sierra part number 18-0603, so installers get all the gaskets required for the job in one purchase instead of ordering each gasket individually. It is intended for use specifically with the Sierra 18-1998-1 exhaust manifold on Ford 302-351 CID engines, and is a direct cross-reference for the GLM 39920 gasket set.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0603\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Exhaust Manifold Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Ford 302-351 CID Engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse With Manifold:\u003c\/strong\u003e 18-1998-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Exhaust manifold gaskets (18-0183-1) and exhaust elbow gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.33 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 set\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFord 302-351 CID Engines\u003c\/li\u003e\n\u003cli\u003eUse with Sierra 18-1998-1 exhaust manifold\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGLM 39920\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0603 gasket set fit?\u003c\/strong\u003e The Sierra 18-0603 Exhaust Manifold Gasket Set is designed for Ford 302-351 CID marine engines and is intended for use with the Sierra 18-1998-1 exhaust manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0603 the same as GLM 39920?\u003c\/strong\u003e Yes, Sierra 18-0603 is interchangeable with GLM 39920, so it can be used as a direct replacement wherever that gasket set is called for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-0603 gasket set?\u003c\/strong\u003e The set contains exhaust manifold gaskets (18-0183-1) along with exhaust elbow gaskets, giving you the matched gaskets needed for a full manifold installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the 18-0603 set?\u003c\/strong\u003e The Sierra 18-0603 kit is packaged as a single unit count set containing exhaust manifold gaskets and exhaust elbow gaskets for one complete installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0603 gasket set?\u003c\/strong\u003e The gaskets in the Sierra 18-0603 set are white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0603 gasket set weigh?\u003c\/strong\u003e The Sierra 18-0603 Exhaust Manifold Gasket Set weighs 0.33 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0603 gasket set work with any exhaust manifold?\u003c\/strong\u003e No, the 18-0603 set is specifically intended for use with the Sierra 18-1998-1 exhaust manifold on Ford 302-351 CID engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0603 gasket set genuine OEM or aftermarket?\u003c\/strong\u003e The 18-0603 is a Sierra-manufactured replacement gasket set built to meet or exceed the specifications of the original equipment part it replaces, rather than a factory OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0603 gasket set be used on a closed cooling system?\u003c\/strong\u003e The Sierra 18-0603 Exhaust Manifold Gasket Set is suited for exhaust manifold installations on Ford 302-351 CID engines using the 18-1998-1 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat part number should I order to replace worn exhaust manifold gaskets on a Ford 302-351 CID marine engine?\u003c\/strong\u003e Sierra part number 18-0603 is the correct gasket set for replacing the exhaust manifold gaskets on a Ford 302-351 CID engine equipped with the 18-1998-1 manifold.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084011227,"sku":"SIE-18-0603","price":34.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0603_lg__66405.1558118802.500.750.jpg?v=1785188246"},{"product_id":"exhaust-seal-18-0617-for-yamaha-f75-f80-f90-f100-f115-outboards-replaces-67f-41138-00-00","title":"Sierra Exhaust Seal 18-0617 for Yamaha F75\/F80\/F90\/F100\/F115 Outboards, Replaces 67F-45127-00-00","description":"\u003cp\u003eThe Sierra Exhaust Seal, part number 18-0617, is a replacement seal engineered for the exhaust system of specific Yamaha four-stroke outboard engines. It is designed as a direct equivalent to the OEM Yamaha seal, restoring a proper exhaust seal at the point it is installed and helping prevent exhaust leaks, water intrusion, or loss of exhaust pressure that can occur once the original seal wears out or hardens with age and heat cycling.\u003c\/p\u003e\u003cp\u003eThis seal is intended for outboards in the Yamaha F75, F80, F90, F100, and F115 model range, and is a routine maintenance and repair item for owners servicing the exhaust system on these engines. Replacing a worn exhaust seal with the correct part helps maintain proper engine operation and prevents secondary issues that can result from an exhaust leak going unaddressed. At 0.7 pounds, it ships as a compact, easy-to-handle component suited for do-it-yourself installation or use by a marine service technician during a routine exhaust system service.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0617\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Exhaust Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Engine Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.7 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282291549\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 67F-45127-00-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYamaha F75, 2003-Current\u003c\/li\u003e\n\u003cli\u003eYamaha F80, 1999-2003\u003c\/li\u003e\n\u003cli\u003eYamaha F90, 2003-Current\u003c\/li\u003e\n\u003cli\u003eYamaha F100, 1999-2003\u003c\/li\u003e\n\u003cli\u003eYamaha F115, 2000-Current\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e67F-45127-00-00\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0617 exhaust seal fit?\u003c\/strong\u003e The Sierra 18-0617 exhaust seal fits Yamaha F75 (2003-Current), F80 (1999-2003), F90 (2003-Current), F100 (1999-2003), and F115 (2000-Current) outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-0617 replace?\u003c\/strong\u003e Sierra part 18-0617 replaces Yamaha OEM part number 67F-45127-00-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this exhaust seal weigh?\u003c\/strong\u003e The Sierra 18-0617 exhaust seal weighs 0.7 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0617 a genuine Yamaha part or an aftermarket replacement?\u003c\/strong\u003e 18-0617 is a Sierra-branded replacement part manufactured to match the fit and function of Yamaha OEM part 67F-45127-00-00, not a genuine Yamaha-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this seal fit a Yamaha F100 from any model year?\u003c\/strong\u003e The Sierra 18-0617 exhaust seal is listed for the Yamaha F100 for the 1999-2003 model years specifically.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this seal fit the Yamaha F115?\u003c\/strong\u003e Yes, the Sierra 18-0617 exhaust seal fits the Yamaha F115 for 2000-Current model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate this exhaust seal needs replacement?\u003c\/strong\u003e A worn or failed exhaust seal like the Sierra 18-0617 can allow an exhaust leak or water intrusion at the seal location, which is a common reason to replace it during outboard servicing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the UPC to confirm I am ordering the correct part?\u003c\/strong\u003e Yes, the Sierra 18-0617 exhaust seal carries UPC 808282291549, which can be used to verify you are ordering the correct item.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Yamaha F80 use the same seal as the F90?\u003c\/strong\u003e Yes, the Sierra 18-0617 exhaust seal covers both the Yamaha F80 (1999-2003) and F90 (2003-Current) among its listed fitments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a common maintenance item to replace?\u003c\/strong\u003e Exhaust seals such as the Sierra 18-0617 are a routine wear item replaced during exhaust system service on the covered Yamaha outboard models.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084043995,"sku":"SIE-18-0617","price":2.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0617__13580.1558184457.500.750.jpg?v=1785329159"},{"product_id":"sierra-18-0604-exhaust-manifold-gasket-set-for-gm-283-305-307-350-cid-volvo-penta-307-350-cid-marine-engines-1968-1980","title":"Sierra 18-0604 Exhaust Manifold Gasket Set - GM 305-350 CID Engines","description":"\u003cp\u003eThe Sierra 18-0604 Exhaust Manifold Gasket Set is a replacement gasket kit for GM 305-350 CID marine engines, designed for use with exhaust manifold 18-1997-1. The set contains two exhaust elbow gaskets and two 18-2949 exhaust manifold gaskets, giving you the seals needed to reseat the manifold and elbow assembly during a rebuild or gasket replacement. The gaskets are white in color and are built to meet or exceed the specifications of the original equipment parts they replace, making them a reliable choice when servicing a GM small block V8 marine exhaust system. Because exhaust manifold gaskets are subject to constant heat cycling and exposure to exhaust gases and cooling water, replacing them with a properly sized, purpose-built set like the 18-0604 helps prevent water intrusion, exhaust leaks, and manifold corrosion. This gasket set is interchangeable with GLM 39910, so it can be used as a direct swap wherever that number is called for. Whether you are pulling a manifold for inspection, replacing a leaking gasket, or performing routine maintenance on a GM 305-350 CID marine engine, the 18-0604 set provides the correct gaskets for the job in one package.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0604\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e GM 305-350 CID Engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse With Manifold:\u003c\/strong\u003e 18-1997-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e (2) Exhaust Elbow Gaskets, (2) 18-2949 Exhaust Manifold Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchangeable With:\u003c\/strong\u003e GLM 39910\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282242787\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.37 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM 305-350 CID Engines\u003c\/li\u003e\n\u003cli\u003eUse with Manifold: 18-1997-1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGLM 39910\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0604 exhaust manifold gasket set fit?\u003c\/strong\u003e The 18-0604 gasket set is designed for GM 305-350 CID marine engines and is used with exhaust manifold 18-1997-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0604 interchangeable with any other part numbers?\u003c\/strong\u003e Yes, the Sierra 18-0604 exhaust manifold gasket set is interchangeable with GLM 39910.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-0604 gasket set?\u003c\/strong\u003e Two exhaust elbow gaskets and two 18-2949 exhaust manifold gaskets are included in the Sierra 18-0604 set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich manifold does the 18-0604 gasket set pair with?\u003c\/strong\u003e This gasket set is used with exhaust manifold 18-1997-1 on GM 305-350 CID engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color are the gaskets in the Sierra 18-0604 set?\u003c\/strong\u003e The gaskets in the 18-0604 set are white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0604 gasket set weigh?\u003c\/strong\u003e The Sierra 18-0604 exhaust manifold gasket set weighs 0.37 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0604 meet OEM specifications?\u003c\/strong\u003e Sierra states that the 18-0604 gasket set meets or exceeds the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many exhaust elbow gaskets come in the 18-0604 set?\u003c\/strong\u003e The set includes two exhaust elbow gaskets along with two 18-2949 exhaust manifold gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a separate mounting kit to install the 18-0604 gasket set?\u003c\/strong\u003e The 18-0604 gasket set itself does not include a mounting kit; the manifold it pairs with, 18-1997-1, uses mounting kit 18-8536 with its own manifold gasket and bolts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0604 gasket set?\u003c\/strong\u003e The UPC for the Sierra 18-0604 exhaust manifold gasket set is 808282242787.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084306139,"sku":"SIE-18-0604","price":32.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0604_lg__09486.1558118853.500.750.jpg?v=1785188963"},{"product_id":"sierra-18-0720-closed-dry-joint-exhaust-gasket-replaces-mercruiser-27-864549a02-fits-4-3l-5-0l-5-7l-6-2l","title":"Sierra 18-0720 Closed Dry-Joint Gasket, Replaces Mercruiser 27-864549A02, Fits 4.3L Alpha\/Bravo (2002 and Newer)","description":"\u003cp\u003eThe Sierra 18-0720 is a Closed Dry-Joint Gasket engineered for MerCruiser 4.3L Alpha and Bravo drive applications built 2002 and newer without engine catalyst. It seals the joint between the dry-joint exhaust manifold and riser, a design used on modern MerCruiser sterndrive engines to keep raw cooling water separated from the exhaust path at the manifold-to-riser connection. The gasket is round in shape and finished in white, and is sized to mate directly with the Sierra 18-1843 manifold and Sierra 18-1845 riser, making it a straightforward drop-in replacement when servicing or resealing this joint.\u003c\/p\u003e\u003cp\u003eThis is the \"Closed\" style gasket in Sierra's dry-joint gasket lineup; the same part family is also offered in Open (18-0721) and Restricted (18-0722) configurations, so it is important to confirm the closed-style gasket is the correct one for your manifold-to-riser setup before ordering. The gasket directly replaces Mercruiser 27-864549A02 and 27-864549A01, letting owners source a Sierra-branded equivalent without hunting down the original Mercruiser part number. As with all Sierra engine and drive parts, it is built to meet or exceed the specifications of the original equipment part it replaces and is designed to hold up to the heat and corrosion exposure of the marine exhaust environment.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0720\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Closed Dry-Joint Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.25 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282359447\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e MerCruiser 4.3L Alpha\/Bravo, 2002 and newer, without engine catalyst\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse With:\u003c\/strong\u003e Manifold Sierra Part Number 18-1843 and Riser Sierra Part Number 18-1845\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelated Variants:\u003c\/strong\u003e Open Dry-Joint Gasket 18-0721, Restricted Dry-Joint Gasket 18-0722\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMerCruiser 4.3L Alpha\/Bravo, 2002 and newer, without engine catalyst\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 27-864549A02\u003c\/li\u003e\n\u003cli\u003eMercruiser 27-864549A01\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0720 gasket fit?\u003c\/strong\u003e The Sierra 18-0720 Closed Dry-Joint Gasket fits MerCruiser 4.3L Alpha and Bravo drive applications built 2002 and newer without engine catalyst.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercruiser part numbers does 18-0720 replace?\u003c\/strong\u003e It replaces Mercruiser 27-864549A02 and 27-864549A01.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0720 an Open, Closed, or Restricted style gasket?\u003c\/strong\u003e It is the Closed style dry-joint gasket. Sierra also offers this same gasket in an Open style (18-0721) and a Restricted style (18-0722), so confirm which style your manifold-to-riser joint requires before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat manifold and riser does this gasket pair with?\u003c\/strong\u003e The 18-0720 gasket is used with the Sierra 18-1843 manifold and Sierra 18-1845 riser at the dry-joint connection between them.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and shape is the 18-0720 gasket?\u003c\/strong\u003e It is a round gasket finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0720 gasket weigh?\u003c\/strong\u003e The Sierra 18-0720 Closed Dry-Joint Gasket weighs 0.25 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0720 gasket genuine Sierra or an aftermarket copy?\u003c\/strong\u003e It is a genuine Sierra-branded part, engineered to meet or exceed the specifications of the original Mercruiser equipment it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between 18-0720, 18-0721, and 18-0722?\u003c\/strong\u003e 18-0720 is the Closed style dry-joint gasket, 18-0721 is the Open style, and 18-0722 is the Restricted style; all three are part of the same dry-joint gasket family but are not interchangeable, so the correct style must be matched to the manifold-and-riser setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0720 gasket work on engines with a catalyst?\u003c\/strong\u003e No, the 18-0720 is fitted to MerCruiser 4.3L Alpha\/Bravo applications 2002 and newer without engine catalyst.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0720?\u003c\/strong\u003e You receive one Sierra 18-0720 Closed Dry-Joint Gasket, sized for the joint between the 18-1843 manifold and 18-1845 riser.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085584091,"sku":"SIE-18-0720","price":54.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0720__87403.1558184516.500.750.jpg?v=1785187985"},{"product_id":"sierra-18-0721-open-dry-joint-riser-gasket-replaces-mercruiser-27-864547a02-fits-4-3l-5-0l-5-7l-6-2l-dry-joint-manifold-and-riser","title":"Sierra 18-0721 Open Dry-Joint Exhaust Gasket, Replaces Mercruiser 27-864547A02\/27-864547A01, Fits 4.3L Alpha\/Bravo 2002 and Newer","description":"\u003cp\u003eThe Sierra 18-0721 is an Open-style dry-joint exhaust gasket engineered as a direct replacement for the original equipment gasket on MerCruiser 4.3L Alpha\/Bravo sterndrive applications built 2002 and newer without engine catalyst. Dry-joint gaskets seal the mating surface between the exhaust manifold and riser, and choosing the correct style matters: this is the Open variant, part of a three-style family (Open, Closed, and Restricted) that all share a common mounting footprint but differ in how they route exhaust flow. Installing the wrong style can affect engine cooling and exhaust backpressure, so confirming 18-0721 against your existing gasket or manufacturer reference before ordering is important.\u003c\/p\u003e\u003cp\u003eThis gasket is round in shape and finished in white, and is sold as a single unit for one exhaust joint. It directly replaces the Mercruiser OEM gasket numbers 27-864547A02 and 27-864547A01, so it can be used as a drop-in service part during manifold or riser replacement, tune-up, or routine maintenance where the old dry-joint seal has failed or is showing signs of leakage or corrosion. Sierra manufactures the 18-0721 to meet or exceed the specifications of the original equipment part it replaces, making it a reliable choice for engine and drive maintenance in the demanding marine environment.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0721\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Dry Joint Gasket (Open)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.25 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282359454\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 4.3L Alpha\/Bravo (2002 and newer without engine catalyst)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelated Gasket Styles:\u003c\/strong\u003e 18-0720 (Closed), 18-0722 (Restricted)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 27-864547A02, 27-864547A01\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser 4.3L Alpha\/Bravo sterndrive, 2002 and newer, without engine catalyst\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-864547A02\u003c\/li\u003e\n\u003cli\u003e27-864547A01\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0721 gasket fit?\u003c\/strong\u003e The 18-0721 is designed for MerCruiser 4.3L Alpha\/Bravo sterndrive applications built 2002 and newer without engine catalyst.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-0721 replace?\u003c\/strong\u003e It replaces Mercruiser 27-864547A02 and 27-864547A01, making it a direct swap for either of those original equipment gasket numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0721 the Open, Closed, or Restricted dry-joint gasket?\u003c\/strong\u003e 18-0721 is the Open-style dry-joint gasket. Sierra also offers 18-0720 as the Closed style and 18-0722 as the Restricted style for the same joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0721 gasket weigh?\u003c\/strong\u003e The gasket weighs 0.25 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and shape is the 18-0721 gasket?\u003c\/strong\u003e It is round in shape and white in color.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0721 come with mounting hardware?\u003c\/strong\u003e The 18-0721 is sold as a single gasket unit; it does not include the manifold, riser, or fastening hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the Open, Closed, or Restricted version?\u003c\/strong\u003e Match the style to the gasket currently installed or to your manifold and riser specification, since 18-0720, 18-0721, and 18-0722 share a mounting footprint but route exhaust flow differently.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0721 genuine OEM or aftermarket?\u003c\/strong\u003e The 18-0721 is a Sierra-manufactured replacement part, built to meet or exceed the specifications of the Mercruiser 27-864547A02\/27-864547A01 gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-0721 fit a 4.3L engine with a catalyst-equipped exhaust?\u003c\/strong\u003e No, this gasket is specified for 4.3L Alpha\/Bravo applications 2002 and newer without engine catalyst.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0721?\u003c\/strong\u003e The UPC for Sierra 18-0721 is 808282359454.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085616859,"sku":"SIE-18-0721","price":65.35,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0721__80767.1713451370.500.750.jpg?v=1785188213"},{"product_id":"sierra-18-0722-restricted-dry-joint-riser-gasket-replaces-mercruiser-27-864850a02-fits-4-3l-5-0l-5-7l-6-2l-dry-joint-manifold-riser","title":"Sierra 18-0722 Restricted Dry-Joint Exhaust Gasket, Replaces Mercruiser 27-864850A02\/27-864850A01, Fits 4.3L Alpha\/Bravo 2002 and Newer","description":"\u003cp\u003eThe Sierra 18-0722 is a Restricted Dry-Joint Gasket engineered for the dry-joint exhaust manifold and riser assembly on 4.3L Alpha\/Bravo sterndrive engines built 2002 and newer without an engine catalyst. It seals the joint between the exhaust manifold and riser, and its restricted design controls exhaust and cooling water flow through that joint to the manufacturer's original specification. This gasket is one of three dry-joint gasket styles Sierra offers for this application - open, closed, and restricted - so it is important to confirm that a restricted style is the correct replacement for your engine before ordering.\u003c\/p\u003e\u003cp\u003eThe 18-0722 is intended for use with Sierra's dry-joint manifold (Sierra Part Number 18-1843) and riser (Sierra Part Number 18-1845), and it is also listed alongside Sierra's dry-joint elbow gaskets 18-0720 and 18-0721 as part of the same gasket family. It directly replaces Mercruiser part numbers 27-864850A02 and 27-864850A01, making it a straightforward like-for-like swap when servicing the exhaust manifold-to-riser joint. The gasket is round in shape and finished in white.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0722\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket Style:\u003c\/strong\u003e Restricted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.25 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282359461\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e Sierra Manifold 18-1843 and Sierra Riser 18-1845\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelated Dry-Joint Elbow Gaskets:\u003c\/strong\u003e 18-0720 (Closed), 18-0721 (Open)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 4.3L Alpha\/Bravo (2002 and Newer without Engine Catalyst)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits 4.3L Alpha\/Bravo applications, 2002 and newer, without engine catalyst. Used with the dry-joint manifold and riser on 4.3L, 5.0L, 5.7L, and 6.2L engines.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eReplaces Mercruiser 27-864850A02 and 27-864850A01.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0722 gasket fit?\u003c\/strong\u003e The Sierra 18-0722 fits 4.3L Alpha\/Bravo sterndrive applications built 2002 and newer without an engine catalyst, and is used with the dry-joint manifold and riser on 4.3L, 5.0L, 5.7L, and 6.2L engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-0722 replace?\u003c\/strong\u003e It replaces Mercruiser part numbers 27-864850A02 and 27-864850A01.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0722 the open, closed, or restricted style gasket?\u003c\/strong\u003e Sierra 18-0722 is the restricted style dry-joint gasket; Sierra also offers 18-0720 as the closed style and 18-0721 as the open style for the same application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat manifold and riser does this gasket work with?\u003c\/strong\u003e The 18-0722 restricted gasket is designed for use with Sierra's dry-joint manifold, Sierra Part Number 18-1843, and Sierra's dry-joint riser, Sierra Part Number 18-1845.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the restricted, open, or closed gasket style?\u003c\/strong\u003e The three Sierra dry-joint gaskets - 18-0720 (closed), 18-0721 (open), and 18-0722 (restricted) - control exhaust and cooling water flow differently through the manifold-to-riser joint, so match the style to what your original gasket was to ensure correct flow through the joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape and color is the 18-0722 gasket?\u003c\/strong\u003e The Sierra 18-0722 is a round gasket finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0722 gasket weigh?\u003c\/strong\u003e The Sierra 18-0722 restricted dry-joint gasket weighs 0.25 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0722 a genuine Sierra part or aftermarket equivalent?\u003c\/strong\u003e The 18-0722 is a genuine Sierra part manufactured to meet or exceed the original Mercruiser part it replaces, 27-864850A02\/27-864850A01.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0722 fit engines with an engine catalyst?\u003c\/strong\u003e No, the fitment for the 18-0722 is specified as 4.3L Alpha\/Bravo, 2002 and newer, without engine catalyst.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0722 gasket?\u003c\/strong\u003e The Sierra 18-0722 restricted dry-joint gasket carries UPC 808282359461.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0722 be used with the 18-0720 or 18-0721 gaskets on the same joint?\u003c\/strong\u003e No, only one gasket style is used per joint; 18-0720, 18-0721, and 18-0722 are alternative styles for the same dry-joint manifold-to-riser application, not parts used together.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085715163,"sku":"SIE-18-0722","price":54.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0722__53775.1558184523.500.750.jpg?v=1785188055"},{"product_id":"sierra-18-0823-exhaust-manifold-gasket-for-yamaha-outboard-replaces-oem-6e5-13645-a1-00","title":"Sierra Exhaust Manifold Gasket 18-0823 for Yamaha Outboard, Replaces 6E5-41112-A1-00","description":"\u003cp\u003eThe Sierra 18-0823 is an exhaust manifold gasket engineered for Yamaha outboard engines. It seals the joint between the exhaust manifold and the powerhead, containing exhaust gases and cooling water so the manifold runs leak-free and the cooling circuit stays sealed under engine heat and vibration. This gasket is a direct cross to Yamaha OEM part 6E5-41112-A1-00, giving you a genuine-fit replacement without having to source through the engine manufacturer. Two gaskets are used per engine application, so plan to order accordingly when doing a manifold service or full gasket set replacement. As with any exhaust manifold gasket, install it dry (unless the engine manual specifies otherwise), torque the manifold fasteners to the engine manufacturer's spec in the proper sequence, and replace the gasket any time the manifold is removed rather than reusing the old one. The round gasket ships as a single component, ready to install, and is sized and shaped to match the mounting pattern of the Yamaha manifold it services.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0823\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Yamaha Outboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required Per Engine:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282257446\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 6E5-41112-A1-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eYamaha outboard engines using OEM exhaust manifold gasket 6E5-41112-A1-00\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e6E5-41112-A1-00\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0823 gasket fit?\u003c\/strong\u003e The Sierra 18-0823 is an exhaust manifold gasket built for Yamaha outboard engines, cross-referencing to Yamaha OEM part 6E5-41112-A1-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0823 the same as Yamaha part 6E5-41112-A1-00?\u003c\/strong\u003e Yes, Sierra 18-0823 is the direct cross-reference replacement for Yamaha OEM exhaust manifold gasket 6E5-41112-A1-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets do I need for one engine?\u003c\/strong\u003e Two of the Sierra 18-0823 exhaust manifold gaskets are required per engine application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is this gasket?\u003c\/strong\u003e The 18-0823 exhaust manifold gasket is round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0823 gasket weigh?\u003c\/strong\u003e Sierra part 18-0823 weighs 0.08 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e Ordering Sierra 18-0823 gets you one exhaust manifold gasket; since two are required per engine, order two units for a complete job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-0823 is a Sierra-branded exhaust manifold gasket manufactured as a cross-reference replacement for the Yamaha OEM gasket, not an OEM Yamaha part itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I reuse the old exhaust manifold gasket instead of buying 18-0823?\u003c\/strong\u003e No, exhaust manifold gaskets like the Sierra 18-0823 should be replaced any time the manifold is removed rather than reused, to ensure a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0823 gasket need sealant during installation?\u003c\/strong\u003e Sierra 18-0823 is a standard exhaust manifold gasket; follow your engine manufacturer's torque sequence and sealant guidance when installing it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with Sierra 18-0823?\u003c\/strong\u003e The UPC for the Sierra 18-0823 exhaust manifold gasket is 808282257446.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-0823 on a non-Yamaha outboard?\u003c\/strong\u003e Sierra 18-0823 is designed for Yamaha outboard applications matching OEM part 6E5-41112-A1-00; fitment outside that application is not confirmed.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085747931,"sku":"SIE-18-0823","price":7.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0823_lg__34400.1558120846.500.750.jpg?v=1785188556"},{"product_id":"sierra-18-0680-exhaust-manifold-gasket-for-mercruiser-3-0l-3-0lx-replaces-27-815528-omc-3853256","title":"Sierra 18-0680 Exhaust Manifold Gasket, Replaces 912164, Pack of 2","description":"\u003cp\u003eThe Sierra 18-0680 Exhaust Manifold Gasket is a replacement gasket engineered to seal the exhaust manifold joint on inboard and sterndrive engines, sealing against exhaust gas and coolant leakage at the manifold mating surface. It is built to meet or exceed the quality of the original equipment part it replaces, giving installers a dependable seal without the premium of a dealer-sourced OEM part. The gasket is round in shape and finished in white, and it ships as a pack of 2, which covers a typical single-manifold replacement or gives a spare on hand for a future service. Because exhaust manifold gaskets are compression-sealed and exposed to repeated heat cycling, they are a wear item that should be replaced any time the manifold is removed for service, rather than reused. This gasket carries the Sierra part number 18-0680 and directly replaces OEM number 912164, making it straightforward to identify against the number stamped on or referenced for the original gasket being removed. At 0.03 pounds, it is a lightweight, low-cost component that is inexpensive insurance against exhaust leaks compared to the labor cost of re-pulling a manifold to fix a failed seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0680\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282105938\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e912164\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0680 gasket fit?\u003c\/strong\u003e The 18-0680 is an exhaust manifold gasket that seals the manifold mating joint and directly replaces OEM number 912164.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs OEM part number 912164 the same as the Sierra 18-0680?\u003c\/strong\u003e Yes, Sierra 18-0680 is the direct replacement for OEM number 912164, so it can be ordered in place of that original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package of 18-0680?\u003c\/strong\u003e Each package of the 18-0680 contains 2 exhaust manifold gaskets, enough for a manifold replacement plus a spare.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-0680 exhaust manifold gasket?\u003c\/strong\u003e The 18-0680 gasket is white in color and round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0680 gasket weigh?\u003c\/strong\u003e The 18-0680 exhaust manifold gasket weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse an old exhaust manifold gasket instead of buying the 18-0680?\u003c\/strong\u003e No, exhaust manifold gaskets like the 18-0680 are compression seals meant for one-time use; reusing a removed gasket often leads to leaks since it has already been crushed to seal the original joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0680 genuine OEM or aftermarket?\u003c\/strong\u003e The 18-0680 is a Sierra-brand replacement gasket built to meet or exceed the original equipment part it replaces, rather than being sourced from the original engine manufacturer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0680?\u003c\/strong\u003e An order of the Sierra 18-0680 includes a package of 2 exhaust manifold gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does an exhaust manifold gasket need replacing?\u003c\/strong\u003e Exhaust manifold gaskets like the 18-0680 are subjected to repeated heat cycling and compression, which over time causes them to lose their seal and allow exhaust or coolant leakage at the manifold joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0680 gasket handle exhaust manifold heat cycling?\u003c\/strong\u003e Yes, the 18-0680 is designed as an exhaust manifold gasket, meaning it is built to seal against the repeated heat exposure at the manifold joint.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085846235,"sku":"SIE-18-0680","price":16.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0680_lg__46689.1558121722.500.750.jpg?v=1785188494"},{"product_id":"sierra-18-0956-1-exhaust-manifold-gasket-for-chrysler-460-cid-inboard-replaces-118-614","title":"Sierra Exhaust Manifold Gasket 18-0956-1 for 3.7L 224 CID Chrysler Inboard Engines","description":"\u003cp\u003eThe Sierra Exhaust Manifold Gasket, part number 18-0956-1, is a round replacement gasket engineered for 3.7L 224 CID 4-cylinder Chrysler inboard marine engines. This gasket seals the connection at the exhaust manifold, maintaining a tight seal against exhaust gases and coolant while the engine runs, which helps prevent leaks that can lead to overheating or exhaust intrusion into the bilge.\u003c\/p\u003e\u003cp\u003eThis gasket is used as part of the manifold gasket application for 170 HP and 180 HP 3.7L 224 CID engines built in 1985-1986 and 1987, and it is specified for engines fitted with either aluminum or cast iron exhaust manifolds, depending on the accompanying gasket set. It ships as a single gasket unit and is finished in white. Marine exhaust manifold gaskets like this one are a wear item that should be replaced any time the exhaust manifold is removed for service, since reusing an old gasket risks an improper seal and a repeat leak.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0956-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282365813\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eChrysler 3.7L 224 CID 4-cylinder inboard engines, 170 HP, 1985-1986, engines with aluminum exhaust manifolds, serial numbers 6916779 to B434940\u003c\/li\u003e\n\u003cli\u003eChrysler 3.7L 224 CID 4-cylinder inboard engines, 170 HP, 1985-1986, engines with cast iron exhaust manifolds, serial numbers 6916779 to B434940\u003c\/li\u003e\n\u003cli\u003eChrysler 3.7L 224 CID 4-cylinder inboard engines, 180 HP, 1987, engines with aluminum exhaust manifolds, serial numbers B436391 to B775248\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eNo OEM cross-reference numbers are listed for this gasket.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0956-1 exhaust manifold gasket fit?\u003c\/strong\u003e This gasket fits Chrysler 3.7L 224 CID 4-cylinder inboard engines rated at 170 HP (1985-1986) and 180 HP (1987).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-0956-1 work with both aluminum and cast iron exhaust manifolds?\u003c\/strong\u003e Yes, depending on the specific engine build. On the 170 HP 1985-1986 engines, 18-0956-1 is used with either the aluminum manifold gasket set or the cast iron manifold gasket set, and it is also used on the 180 HP 1987 aluminum manifold application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my engine's serial number is covered?\u003c\/strong\u003e For the 170 HP 1985-1986 application, 18-0956-1 covers serial numbers 6916779 through B434940. For the 180 HP 1987 application, it covers serial numbers B436391 through B775248.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-0956-1 gasket?\u003c\/strong\u003e The Sierra 18-0956-1 exhaust manifold gasket is white and round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of 18-0956-1?\u003c\/strong\u003e Each package of the 18-0956-1 gasket contains one gasket unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0956-1 exhaust manifold gasket weigh?\u003c\/strong\u003e The 18-0956-1 gasket weighs 0.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0956-1 used alongside other gaskets in the same repair?\u003c\/strong\u003e Yes. For the 170 HP 1985-1986 aluminum manifold application, 18-0956-1 is used together with 18-1937 and 18-0881-1. For the cast iron manifold application on the same engine, it is used together with 18-0113-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-0956-1 exhaust manifold gasket is a genuine Sierra part, identified by Sierra part number 18-0956-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the exhaust manifold gasket?\u003c\/strong\u003e The 18-0956-1 gasket should be replaced any time the exhaust manifold is removed from a 3.7L 224 CID Chrysler inboard engine, since reinstalling a used gasket increases the risk of leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-0956-1 have a UPC I can use to verify the part?\u003c\/strong\u003e Yes, the Sierra 18-0956-1 exhaust manifold gasket carries UPC 808282365813.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086468827,"sku":"SIE-18-0956-1","price":26.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0956_lg__01824.1558119064.500.750.jpg?v=1785188012"},{"product_id":"mercruiser-manifold-end-cap-gasket-27-73814-2-pack-fits-mcm-mie-120-140-165-470-898-228-260","title":"Sierra Manifold End Cap Gasket 18-0928-1-9, Replaces 27-73814, Fits MerCruiser MCM\/MIE 120-260 (Pack of 2)","description":"\u003cp\u003eThe Sierra Manifold End Cap Gasket, part number 18-0928-1-9, seals the end cap on MerCruiser exhaust manifolds to prevent exhaust and coolant leaks at the manifold-to-end-cap joint. It is made of graphite-infused stainless steel for superior compressibility, letting it conform to mating surfaces and hold a reliable seal under the heat and vibration of engine operation. Each gasket is sold in a pack of two so both end caps on an engine can be replaced together during a manifold service or gasket refresh. This gasket is a direct replacement for OEM part 27-73814, giving MerCruiser owners a straightforward way to source the correct seal without hunting down the original part. It fits MerCruiser MCM\/MIE 120 (2.5L), 140 (3.0L), and 165 inline 6-cylinder engines, as well as MCM\/MIE 470, 898, 228, and 260 engines. Backed by Sierra's industry-leading warranty, it is a precision-made component intended for straightforward removal-and-replace installation during routine exhaust manifold maintenance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0928-1-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Graphite-infused stainless steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 7.01 x 6.97 x 0.31 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282369187\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercruiser exhaust manifolds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser MCM\/MIE 120 (2.5L)\u003c\/li\u003e\n\u003cli\u003eMerCruiser MCM\/MIE 140 (3.0L)\u003c\/li\u003e\n\u003cli\u003eMerCruiser MCM\/MIE 165 (inline 6-cylinder)\u003c\/li\u003e\n\u003cli\u003eMerCruiser MCM\/MIE 470\u003c\/li\u003e\n\u003cli\u003eMerCruiser MCM\/MIE 898\u003c\/li\u003e\n\u003cli\u003eMerCruiser MCM\/MIE 228\u003c\/li\u003e\n\u003cli\u003eMerCruiser MCM\/MIE 260\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-73814\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0928-1-9 gasket fit?\u003c\/strong\u003e This gasket fits MerCruiser MCM\/MIE 120 (2.5L), 140 (3.0L), and 165 inline 6-cylinder engines, along with MCM\/MIE 470, 898, 228, and 260 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-0928-1-9 replace?\u003c\/strong\u003e It is a direct replacement for OEM part 27-73814, the manifold end cap gasket used on the fitted MerCruiser engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e Sierra 18-0928-1-9 is sold in a pack of two gaskets, enough to service both end caps on a single engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra manifold end cap gasket made from?\u003c\/strong\u003e The gasket is made of graphite-infused stainless steel, chosen for its compressibility and ability to hold a seal under engine heat and vibration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The Sierra 18-0928-1-9 manifold end cap gasket weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the gasket?\u003c\/strong\u003e Each individual gasket measures 0.39 x 0.39 x 0.39 inches, and the retail package measures 7.01 x 6.97 x 0.31 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e 18-0928-1-9 is a genuine Sierra part, backed by Sierra's industry-leading warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is this gasket used on the engine?\u003c\/strong\u003e It seals the joint between the exhaust manifold and the manifold end cap on the fitted MerCruiser engines, preventing exhaust and coolant leaks at that connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install this gasket myself?\u003c\/strong\u003e Yes, the Sierra 18-0928-1-9 manifold end cap gasket is designed as a direct removal-and-replace part for routine exhaust manifold service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e Ordering 18-0928-1-9 gets you two manifold end cap gaskets, matching the OEM 27-73814 specification.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086501595,"sku":"SIE-18-0928-1-9","price":17.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0928_lg_1__91574.1670333906.500.750.jpg?v=1785188871"},{"product_id":"sierra-18-1842-v6-dry-joint-exhaust-manifold-replaces-mercury-864612t01-fits-4-3l-262cid-alpha-bravo-2002-and-newer","title":"Sierra 18-1842 V6 Dry Joint Exhaust Manifold - Replaces 27-864850A02, 27-864547A1","description":"\u003cp\u003eThe Sierra 18-1842 is a V6 dry joint exhaust manifold built for marine engines that use the dry joint manifold-and-riser exhaust configuration. Unlike a wet-joint design, the dry joint manifold moves water from the manifold to the riser externally rather than through an internal water jacket seal, which essentially eliminates the possibility of water entering the cylinders if a gasket fails. This makes it a common choice when reliability against gasket failure is a priority.\u003c\/p\u003e\u003cp\u003eThe 18-1842 is used together with the 18-1843 manifold and 18-1845 riser as a matched dry joint set, and it can also be used with the OE riser. It fits 4.3L, 5.0L, 5.7L, and 6.2L engines that utilize the dry joint manifold and riser system. The manifold has a white finish and weighs 33 pounds.\u003c\/p\u003e\u003cp\u003eIt directly replaces OEM manifold numbers 27-864850A02 and 27-864547A1, allowing it to be ordered as a drop-in replacement for engines originally fitted with those parts.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1842\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e V6 Dry Joint Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 4.3L, 5.0L, 5.7L, 6.2L engines utilizing the Dry Joint Manifold and Riser system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e 18-1843 Manifold, 18-1845 Riser\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\/Finish:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 33 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 27-864850A02, 27-864547A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits 4.3L, 5.0L, 5.7L, and 6.2L engines that utilize the dry joint manifold and riser exhaust system. Used with the 18-1843 manifold and 18-1845 riser.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-864850A02\u003c\/li\u003e\n\u003cli\u003e27-864547A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1842 exhaust manifold fit?\u003c\/strong\u003e The Sierra 18-1842 fits 4.3L, 5.0L, 5.7L, and 6.2L engines that use the dry joint manifold and riser exhaust configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-1842 replace?\u003c\/strong\u003e It replaces OEM manifold numbers 27-864850A02 and 27-864547A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1842 the same as OEM part 27-864850A02?\u003c\/strong\u003e Yes, the Sierra 18-1842 is a direct replacement for OEM number 27-864850A02 as well as 27-864547A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a dry joint exhaust manifold?\u003c\/strong\u003e A dry joint exhaust manifold, like the Sierra 18-1842, transfers water from the manifold to the riser externally instead of through an internal water jacket seal, which essentially eliminates the possibility of water entering the cylinders if a gasket fails.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1842 manifold weigh?\u003c\/strong\u003e The Sierra 18-1842 exhaust manifold weighs 33 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-1842 manifold?\u003c\/strong\u003e It has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-1842 be used with the OE riser?\u003c\/strong\u003e Yes, the 18-1842 manifold can be used with the OE riser in addition to the Sierra 18-1845 riser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other parts are needed with the 18-1842?\u003c\/strong\u003e The 18-1842 is designed for use as part of a matched dry joint set alongside the 18-1843 manifold and 18-1845 riser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1842 require a specific gasket?\u003c\/strong\u003e The 18-1842 dry joint manifold is designed to work with the dry joint manifold and riser gasket system used in this exhaust configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy choose a dry joint manifold over a wet joint design?\u003c\/strong\u003e The dry joint design used in the 18-1842 essentially eliminates the possibility of water entering the cylinders if there is a gasket failure, since water is transferred externally from the manifold to the riser rather than through an internal seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089024731,"sku":"SIE-18-1842","price":409.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Sierra-18-1842-V6-Dry-Joint-Exhaust-Manifold__95934.1727703225.500.750.jpg?v=1785189034"},{"product_id":"sierra-18-1848-exhaust-manifold-replaces-omc-3852338-fits-4-3l-v-6-omc-sterndrive-cobra","title":"Sierra 18-1848 Exhaust Manifold for GM and Ford Center Rise Engines","description":"\u003cp\u003eThe Sierra 18-1848 is an exhaust manifold built to fit many GM and Ford engines that use a center rise manifold configuration. It is a direct-fit replacement designed to route exhaust gases away from the engine and into the riser and exhaust hose system, maintaining proper cooling water flow and exhaust flow through the powerhead.\u003c\/p\u003e\u003cp\u003eThis manifold is designed to work as part of a complete exhaust system. It pairs with riser gasket 18-0943-2 to seal the connection between the manifold and riser, and with mounting kit 18-8507 for a proper installation. It also cross-references to alternate manifold part number 18-1986-1, so buyers researching either number can confirm they are looking at compatible hardware for the same engine family.\u003c\/p\u003e\u003cp\u003eBecause it fits many GM and Ford applications using the center rise manifold layout, the 18-1848 is a common replacement choice when an original manifold has cracked, corroded, or otherwise failed. At 32 pounds, it is built to the same general weight and duty class as the OEM hardware it replaces.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1848\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Fits many GM and Ford center rise manifolds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion Riser Gasket:\u003c\/strong\u003e 18-0943-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion Mounting Kit:\u003c\/strong\u003e 18-8507\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternate Manifold Reference:\u003c\/strong\u003e 18-1986-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 32 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282266431\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits many GM and Ford engines with a center rise manifold configuration\u003c\/li\u003e\n\u003cli\u003eUse with riser gasket 18-0943-2 and mounting kit 18-8507 for a complete installation\u003c\/li\u003e\n\u003cli\u003eAlternate manifold reference: 18-1986-1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1848 exhaust manifold fit?\u003c\/strong\u003e The Sierra 18-1848 fits many GM and Ford engines that use a center rise manifold configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1848 come with a riser gasket?\u003c\/strong\u003e No, the manifold itself does not include the riser gasket. It is designed to be used with riser gasket 18-0943-2, which should be ordered separately for a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a mounting kit needed to install the 18-1848 manifold?\u003c\/strong\u003e Yes, mounting kit 18-8507 is the companion mounting kit designed for use with the Sierra 18-1848 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1848 manifold weigh?\u003c\/strong\u003e It weighs 32 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-1986-1 the same as the 18-1848?\u003c\/strong\u003e 18-1986-1 is listed as an alternate manifold reference alongside the 18-1848, so the two are associated part numbers for compatible manifold hardware rather than identical part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a direct OEM replacement manifold?\u003c\/strong\u003e The Sierra 18-1848 is designed to fit many GM and Ford engines that use a center rise manifold layout, making it a direct-fit replacement manifold for those applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1848?\u003c\/strong\u003e The UPC for this manifold is 808282266431.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-1848 exhaust manifold made from?\u003c\/strong\u003e Material is not specified for the Sierra 18-1848 in current product data.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-1848 with any riser?\u003c\/strong\u003e The 18-1848 manifold is designed to be used with riser gasket 18-0943-2; using a mismatched gasket can affect the seal between the manifold and riser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-1848 fit both GM and Ford engines?\u003c\/strong\u003e Yes, the 18-1848 is designed to fit many GM and Ford engines that share the center rise manifold configuration.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089057499,"sku":"SIE-18-1848","price":353.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1848_lg__21231.1771260090.500.750.jpg?v=1785329144"},{"product_id":"sierra-18-1843-dry-joint-exhaust-manifold-for-mercruiser-5-0l-5-7l-6-2l-2002-newer-replaces-865735a02","title":"Sierra 18-1843 Dry Joint Exhaust Manifold, Replaces 27-864850A02, Fits 4.3L 5.0L 5.7L 6.2L","description":"\u003cp\u003eThe Sierra 18-1843 is a dry joint style exhaust manifold built for 4.3L, 5.0L, and 5.7L \/ 6.2L marine engines that use the dry joint manifold and riser exhaust system. Unlike wet joint manifolds, the dry joint design keeps the exhaust manifold and riser joint isolated from raw cooling water, which helps reduce the corrosion and joint failure common to older wet joint setups. This manifold is engineered to meet or exceed the performance of the original equipment part it replaces, and it is built to hold up to the heat cycling, vibration, and saltwater or freshwater exposure typical of inboard and sterndrive engine compartments.\u003c\/p\u003e\u003cp\u003eThe 18-1843 is designed to be used together with the 18-1842 manifold and the 18-1845 riser as part of a complete dry joint exhaust manifold and riser system, so buyers replacing one component of this system can order the matching parts with confidence that they are built to work together. This manifold is a direct fit replacement for the OEM part numbers listed below, making it a straightforward swap for engines that originally used those manifolds.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1843\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Dry Joint Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Dry Joint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e 4.3L, 5.0L, 5.7L, 6.2L (dry joint manifold and riser system)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e 18-1843 and 18-1842 manifolds, 18-1845 riser\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-864850A02, 27-864547A1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 49 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282359423\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e4.3L, 5.0L, 5.7L, 6.2L engines using the dry joint exhaust manifold and riser system\u003c\/li\u003e\n\u003cli\u003eUsed with 18-1843 and 18-1842 manifolds and 18-1845 riser\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-864850A02\u003c\/li\u003e\n\u003cli\u003e27-864547A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1843 exhaust manifold fit?\u003c\/strong\u003e The Sierra 18-1843 fits 4.3L, 5.0L, 5.7L, and 6.2L marine engines that use the dry joint exhaust manifold and riser system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1843 a direct OEM replacement?\u003c\/strong\u003e Yes, the 18-1843 is a direct replacement for OEM manifolds 27-864850A02 and 27-864547A1, so it installs in place of the original part without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a dry joint exhaust manifold, and why does it matter?\u003c\/strong\u003e A dry joint exhaust manifold, like the Sierra 18-1843, keeps the manifold-to-riser joint separated from raw cooling water, which reduces the corrosion and joint failure that affect older wet joint exhaust designs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1843 need to be ordered with any other parts?\u003c\/strong\u003e The 18-1843 manifold is designed to be used together with the 18-1842 manifold and the 18-1845 riser as part of one dry joint exhaust system, so matching those parts is recommended for a complete rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1843 weigh?\u003c\/strong\u003e The Sierra 18-1843 exhaust manifold weighs 49 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-1843 cross reference to?\u003c\/strong\u003e The 18-1843 crosses over to OEM numbers 27-864850A02 and 27-864547A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1843 covered by a warranty?\u003c\/strong\u003e Sierra parts, including the 18-1843 manifold, are backed by Sierra's customer satisfaction warranty covering defects in workmanship and materials.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-1843 be used on both 5.0L and 5.7L engines?\u003c\/strong\u003e Yes, the 18-1843 is built to fit 4.3L, 5.0L, 5.7L, and 6.2L engines using the dry joint manifold and riser configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1843 replace a wet joint manifold?\u003c\/strong\u003e No, the 18-1843 is specifically a dry joint style manifold and is intended for engines already set up with a dry joint manifold and riser exhaust system, not a wet joint system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes with the Sierra 18-1843?\u003c\/strong\u003e The Sierra 18-1843 is supplied as a single dry joint exhaust manifold; the matching 18-1842 manifold and 18-1845 riser are separate parts sold individually.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089090267,"sku":"SIE-18-1843","price":545.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1843__54393.1753461487.500.750.jpg?v=1785188130"},{"product_id":"sierra-18-1909-1-exhaust-manifold-riser-elbow-with-hardware-replaces-omc-913784","title":"Sierra 18-1909-1 Manifold Elbow, Replaces OMC 913784, Use with 18-1986-1 Exhaust Manifold","description":"\u003cp\u003eThe Sierra 18-1909-1 Manifold Elbow is a direct-replacement exhaust manifold elbow built to connect to the 18-1986-1 exhaust manifold as part of a marine engine's exhaust system. The manifold elbow routes exhaust gases and cooling water away from the manifold, and this part is designed to work with the corresponding 18-8507 mounting kit for a complete, correctly sealed installation.\u003c\/p\u003e\u003cp\u003eAs an OEM cross-reference replacement, the 18-1909-1 is built to match the fit and function of the original OMC 913784 elbow, giving boat owners and marine technicians a straightforward way to source a replacement without hunting down a discontinued original part. Because exhaust manifold elbows are exposed to constant heat cycling and saltwater or freshwater cooling flow, replacing a corroded or cracked elbow with a properly matched part like the 18-1909-1 helps maintain a tight, leak-free exhaust and cooling path.\u003c\/p\u003e\u003cp\u003eThis part is sold as the manifold elbow itself; the separate 18-8507 mounting kit (which includes the gasket used with this elbow) should be ordered alongside it to complete the installation. Always confirm that your engine's exhaust manifold is the 18-1986-1 before ordering, since manifold elbows are matched to a specific manifold design.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1909-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Manifold Elbow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 26.5 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With Manifold:\u003c\/strong\u003e 18-1986-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Mounting Kit:\u003c\/strong\u003e 18-8507\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 913784, 3855270, 3850459\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282202859\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUse with Manifold 18-1986-1\u003c\/li\u003e\n\u003cli\u003ePair with Mounting Kit 18-8507 for complete installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e913784\u003c\/li\u003e\n\u003cli\u003e3855270\u003c\/li\u003e\n\u003cli\u003e3850459\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat manifold does the Sierra 18-1909-1 fit?\u003c\/strong\u003e The Sierra 18-1909-1 manifold elbow is designed for use with the 18-1986-1 exhaust manifold, so confirm your engine uses that manifold before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1909-1 a direct replacement for OMC 913784?\u003c\/strong\u003e Yes, the 18-1909-1 manifold elbow is built to replace OMC 913784, along with the additional cross-reference numbers 3855270 and 3850459.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1909-1 manifold elbow weigh?\u003c\/strong\u003e The Sierra 18-1909-1 manifold elbow weighs 26.5 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to buy anything else to install the 18-1909-1?\u003c\/strong\u003e Yes, the 18-1909-1 should be paired with the 18-8507 mounting kit, which supplies the gasket and hardware needed for a complete installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1909-1 include a gasket?\u003c\/strong\u003e No, the gasket used with the 18-1909-1 elbow is included in the separate 18-8507 mounting kit rather than with the elbow itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers cross-reference to the Sierra 18-1909-1?\u003c\/strong\u003e The 18-1909-1 cross-references to OEM numbers 913784, 3855270, and 3850459.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace a manifold elbow like the 18-1909-1?\u003c\/strong\u003e Manifold elbows are exposed to constant heat and cooling water flow, so a cracked, corroded, or leaking elbow is typically replaced with a matched part such as the 18-1909-1 to restore a sealed exhaust and cooling path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-1909-1 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-1909-1 is a Sierra-branded aftermarket manifold elbow engineered as a replacement for the OEM 913784 elbow and its cross-referenced numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-1909-1 with a different exhaust manifold?\u003c\/strong\u003e The 18-1909-1 is specified for use with the 18-1986-1 exhaust manifold; fit with other manifold models is not confirmed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the Sierra 18-1909-1?\u003c\/strong\u003e The 18-1909-1 listing covers the manifold elbow itself; the mounting kit (18-8507) with its gasket is a separate item needed to complete the installation.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089188571,"sku":"SIE-18-1909-1","price":325.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__43981.1771440787.500.750.jpg?v=1785188575"},{"product_id":"sierra-18-1931-1-exhaust-manifold-replaces-volvo-penta-835804-856883-omc-volvo-gm-small-block-v8-305-350-1979-89","title":"Sierra 18-1931-1 Manifold, Replaces Volvo Penta 835804-6 and 856883-4","description":"\u003cp\u003eThe Sierra 18-1931-1 is an exhaust manifold built for Volvo Penta stern drive and inboard applications, engineered to meet or exceed the quality of the original equipment part it replaces. The manifold carries a machined exterior finish and is manufactured to the fit and function of the OEM component it is designed to replace, making it a direct swap for boat owners dealing with a cracked, corroded, or leaking factory manifold.\u003c\/p\u003e\u003cp\u003eExhaust manifolds route hot exhaust gases away from the engine while the surrounding water jacket cools the exhaust before it exits the boat, so the integrity of this component is critical to both engine cooling and safe exhaust handling. The Sierra 18-1931-1 is designed as a like-for-like replacement, and Sierra also offers matching mounting hardware kits engineered specifically for use with this manifold, simplifying installation for anyone replacing a worn unit.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1931-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Volvo Penta Exhaust Manifolds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 47 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 25.9 x 10.4 x 9.6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282237431\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Mounting Kits:\u003c\/strong\u003e Sierra 18-8511, Sierra 18-8502\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDesigned for Volvo Penta exhaust manifold applications.\u003c\/li\u003e\n\u003cli\u003eCompatible with Sierra 18-8511 and Sierra 18-8502 mounting kits, both of which are designed for use with the 18-1931-1 manifold.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 51630\u003c\/li\u003e\n\u003cli\u003eMallory 9-40901\u003c\/li\u003e\n\u003cli\u003eOsco 5805\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 835804\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 856883\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 835804-6\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 856883-4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1931-1 replace?\u003c\/strong\u003e The Sierra 18-1931-1 manifold is interchangeable with GLM 51630, Mallory 9-40901, Osco 5805, Volvo Penta 835804, Volvo Penta 856883, Volvo Penta 835804-6, and Volvo Penta 856883-4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this manifold a genuine Sierra part or a generic aftermarket copy?\u003c\/strong\u003e It is a genuine Sierra-branded manifold, part number 18-1931-1, built to meet or exceed the quality of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-1931-1 manifold?\u003c\/strong\u003e The Sierra 18-1931-1 measures 25.9 x 10.4 x 9.6 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1931-1 manifold weigh?\u003c\/strong\u003e This manifold weighs 47 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the manifold have?\u003c\/strong\u003e The Sierra 18-1931-1 has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat application is the 18-1931-1 manifold designed for?\u003c\/strong\u003e It falls under Sierra's Volvo Penta exhaust manifold lineup, designed to replace factory Volvo Penta manifolds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need separate mounting hardware for the 18-1931-1?\u003c\/strong\u003e Yes, Sierra offers the 18-8511 and 18-8502 mounting kits, both specifically designed for use with the 18-1931-1 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-8502 kit include hardware?\u003c\/strong\u003e Yes, the Sierra 18-8502 mounting kit, made for use with the 18-1931-1 manifold, includes mounting studs and hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I cross-reference this part using a Volvo Penta OEM number?\u003c\/strong\u003e Yes, the 18-1931-1 replaces Volvo Penta 835804, 835804-6, 856883, and 856883-4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the UPC available for the 18-1931-1 manifold?\u003c\/strong\u003e The UPC for the Sierra 18-1931-1 manifold is 808282237431.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this manifold include installation hardware in the box?\u003c\/strong\u003e The manifold itself does not include mounting hardware; the matching 18-8511 or 18-8502 kits are sold separately and provide the studs and hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this manifold fit other brands besides Volvo Penta?\u003c\/strong\u003e The 18-1931-1 is categorized as a Volvo Penta exhaust manifold and cross-references to Volvo Penta, GLM, Mallory, and Osco part numbers.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089254107,"sku":"SIE-18-1931-1","price":410.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1931-1__34901.1729835971.500.750.jpg?v=1785188194"},{"product_id":"sierra-18-1932-marine-exhaust-manifold-for-volvo-penta-stern-drive-gm-v-6-replaces-856894-1-cast-iron-port-starboard","title":"Sierra Exhaust Manifold 18-1932 for Volvo Penta GM V6 AQ 175, 205, 430 A\/B, 432, 434 - Replaces 856894-1","description":"\u003cp\u003eThe Sierra 18-1932 is a cast iron exhaust manifold engineered as a direct replacement for the OEM manifold on GM V6-powered Volvo Penta stern drive engines, model years 1993 and before, in the AQ 175, 205, 430 A\/B, 432, and 434 applications. The manifold routes exhaust gases away from the engine while cooling water jackets around the casting help manage engine heat, protecting the engine block from thermal stress during operation. Built from cast iron with a machined exterior finish, it is designed to meet or exceed the fit, form, and function of the original equipment part it replaces, giving boat owners a durable, drop-in solution for manifold replacement or rebuild projects. This manifold fits port and starboard applications. When installing, pair the 18-1932 with the 18-2909 manifold gasket for a proper seal at the mounting surface; the matching 18-2971-1 elbow gasket is used where an 18-1936 elbow is installed alongside this manifold. Because exhaust manifolds are wear items subject to salt water corrosion and thermal cycling, replacing a cracked or leaking manifold with a properly specified part like the 18-1932 helps restore reliable engine cooling and exhaust flow. Always confirm the OE number cast into your existing manifold or stamped on your engine documentation against the cross-reference below before ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1932\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 32 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 856894-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e GM V6 (1993 \u0026amp; Before), Volvo Penta Model AQ 175, 205, 430 A\/B, 432, 434\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion Part:\u003c\/strong\u003e Use with 18-2909 Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282257613\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM (V6) (1993 \u0026amp; Before)\u003c\/li\u003e\n\u003cli\u003eVolvo Penta Model AQ 175\u003c\/li\u003e\n\u003cli\u003eVolvo Penta Model AQ 205\u003c\/li\u003e\n\u003cli\u003eVolvo Penta Model AQ 430 A\/B\u003c\/li\u003e\n\u003cli\u003eVolvo Penta Model AQ 432\u003c\/li\u003e\n\u003cli\u003eVolvo Penta Model AQ 434\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e856894-1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1932 manifold fit?\u003c\/strong\u003e The 18-1932 fits GM V6-powered Volvo Penta stern drive engines built in 1993 and before, specifically model AQ 175, 205, 430 A\/B, 432, and 434.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-1932 replace?\u003c\/strong\u003e This manifold is a direct cross-reference for OEM number 856894-1 on the applicable Volvo Penta GM V6 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1932 manifold for port or starboard?\u003c\/strong\u003e The Sierra 18-1932 exhaust manifold fits both port and starboard applications on the applicable GM V6 Volvo Penta engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-1932 manifold made from?\u003c\/strong\u003e It is constructed from cast iron with a machined exterior finish for durability in the marine exhaust environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1932 manifold weigh?\u003c\/strong\u003e The Sierra 18-1932 exhaust manifold weighs 32 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gasket should I use with the 18-1932 manifold?\u003c\/strong\u003e Use the 18-2909 manifold gasket with the 18-1932 to ensure a proper seal at installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1932 manifold work with the 18-1936 elbow?\u003c\/strong\u003e Yes, when the 18-1936 elbow is used with the 18-1932 manifold, the 18-2971-1 elbow gasket is the matching gasket for that connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1932 a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-1932 is a Sierra-manufactured replacement manifold, built to meet or exceed the specification of the original 856894-1 manifold it replaces rather than being a factory OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-1932 manifold fit any Volvo Penta engine?\u003c\/strong\u003e No, fitment is limited to GM V6 engines from 1993 and before in the AQ 175, 205, 430 A\/B, 432, and 434 models; it is not a universal fit across all Volvo Penta engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-1932 and the 18-1936?\u003c\/strong\u003e The 18-1932 is the exhaust manifold itself, while the 18-1936 is a separate elbow component used alongside it, each requiring its own matching gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089319643,"sku":"SIE-18-1932","price":353.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1932_lg__11009.1722351929.500.750.jpg?v=1785188982"},{"product_id":"exhaust-manifold-with-hardware-for-mercruiser-3-0l-181-cid-replaces-99798a18-fits-140-3-0-1983-95","title":"Sierra Mercruiser Exhaust Manifold w\/Hardware 18-1956-3","description":"\u003cp\u003eThe Sierra 18-1956-3 is an exhaust manifold with hardware, built for Mercruiser exhaust systems. It is designed to work as part of a complete exhaust manifold assembly, pairing with the correct elbow, riser, gaskets, and mounting hardware to route exhaust gases away from the engine safely and reliably. This manifold is engineered to fit directly with Sierra's 18-1978 manifold elbow and 18-1975-1 manifold riser, both of which are listed by the manufacturer as compatible with this manifold. When installed with the 18-1978 elbow, the assembly uses the 18-2833 elbow gasket and 18-4362 mounting kit; when installed with the 18-1975-1 riser, the assembly uses the 18-2819-1 elbow gasket, 18-8551 mounting hardware, and 18-2748 exhaust boot. This gives installers a clear, documented path to building out a matched exhaust manifold system rather than guessing at compatible parts. At 47 pounds, this is a heavy-duty, full-size manifold intended for direct replacement in Mercruiser exhaust manifold applications. Sourcing a manifold with the correct manufacturer-specified mating parts helps ensure a proper seal and secure mounting, reducing the risk of exhaust leaks or improper fitment that can occur when parts are mixed from unverified sources.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1956-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Exhaust Manifolds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 47 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282371463\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifold Elbow:\u003c\/strong\u003e 18-1978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifold Riser:\u003c\/strong\u003e 18-1975-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElbow Gasket (with 18-1978):\u003c\/strong\u003e 18-2833\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Kit (with 18-1978 elbow):\u003c\/strong\u003e 18-4362\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElbow Gasket (with 18-1975-1 riser):\u003c\/strong\u003e 18-2819-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Hardware (with 18-1975-1 riser):\u003c\/strong\u003e 18-8551\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Boot (with 18-1975-1 riser):\u003c\/strong\u003e 18-2748\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is Sierra part 18-1956-3?\u003c\/strong\u003e It is a Sierra exhaust manifold with hardware, listed under Mercruiser exhaust manifolds, part number 18-1956-3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1956-3 manifold come with mounting hardware?\u003c\/strong\u003e Yes, the 18-1956-3 is sold as an exhaust manifold with hardware included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1956-3 exhaust manifold weigh?\u003c\/strong\u003e The Sierra 18-1956-3 exhaust manifold weighs 47 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich elbow fits the 18-1956-3 manifold?\u003c\/strong\u003e Sierra's 18-1978 manifold elbow is listed as compatible for use with the 18-1956-3 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich riser fits the 18-1956-3 manifold?\u003c\/strong\u003e Sierra's 18-1975-1 manifold riser is listed as compatible for use with the 18-1956-3 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gasket do I need if I install the 18-1978 elbow with this manifold?\u003c\/strong\u003e Use the 18-2833 elbow gasket when pairing the 18-1978 elbow with the 18-1956-3 manifold; it is included in the 18-4362 mounting kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gasket do I need if I install the 18-1975-1 riser with this manifold?\u003c\/strong\u003e Use the 18-2819-1 elbow gasket when pairing the 18-1975-1 riser with the 18-1956-3 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mounting hardware is used with the 18-1975-1 riser on this manifold?\u003c\/strong\u003e The 18-8551 hardware kit provides the mounting hardware for the 18-1975-1 riser used with the 18-1956-3 manifold, and the 18-2748 exhaust boot is used with that same riser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-4362 mounting kit?\u003c\/strong\u003e The 18-4362 mounting kit, used with the 18-1978 elbow on the 18-1956-3 manifold assembly, includes the 18-2833 elbow gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the UPC for the 18-1956-3 exhaust manifold available?\u003c\/strong\u003e Yes, the Sierra 18-1956-3 exhaust manifold carries UPC 808282371463.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category does the 18-1956-3 fall under?\u003c\/strong\u003e The 18-1956-3 is categorized as a Mercruiser exhaust manifold by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to buy the elbow and riser separately from the 18-1956-3 manifold?\u003c\/strong\u003e Yes, the 18-1956-3 is the manifold itself; the 18-1978 elbow or 18-1975-1 riser, along with their respective gaskets and mounting hardware, are separate parts documented as compatible with this manifold.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089385179,"sku":"SIE-18-1956-3","price":575.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1956-3__20950.1737824252.500.750.jpg?v=1785329169"},{"product_id":"sierra-18-1952-1-marine-exhaust-manifold-replaces-mercruiser-99746a8-fits-gm-v-6-229-262-cid-1985-2002","title":"Sierra Exhaust Manifold 18-1952-1, Replaces Mercruiser 99746A8, Fits MCM GM V-6 229 and 262 cid Engines 1985-2002","description":"\u003cp\u003eThe Sierra 18-1952-1 is a direct-replacement exhaust manifold built for MCM GM V-6 229 and 262 cid engines (1985-2002). It is designed to fit either the port or starboard side of the engine, so a single part number covers both mounting positions. The manifold carries a machined exterior finish for a precise, reliable fit against the cylinder head and riser\/elbow assembly, and it is supplied with a mounting package to simplify installation.\u003c\/p\u003e\u003cp\u003eThis manifold cross-references directly to Mercruiser 99746A8, 99746A17, and 99746A3, along with equivalent aftermarket numbers, making it a straightforward swap when replacing a worn, cracked, or corroded factory manifold. Sierra manufactures this part to meet or exceed the specifications of the original equipment it replaces, giving boat owners a dependable option for keeping their exhaust system sealed and functioning correctly. At 34 pounds, it matches the weight profile of the OEM cast manifold it is designed to replace.\u003c\/p\u003e\u003cp\u003eBecause the manifold connects directly to the exhaust riser and elbow, it is commonly serviced alongside related components such as manifold gaskets, riser elbows, and mounting kits. Always confirm your engine's exact model and cid rating before ordering to ensure correct fitment.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1952-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 34 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Position:\u003c\/strong\u003e Port and starboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e MCM GM V-6 229 and 262 cid engines (1985-2002)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Hardware:\u003c\/strong\u003e Supplied with mounting package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282237448\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Exhaust Manifolds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMCM GM V-6 229 and 262 cid engines (1985-2002)\u003c\/li\u003e\n\u003cli\u003eFits port and starboard mounting positions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 99746A8\u003c\/li\u003e\n\u003cli\u003eMercruiser 99746A17\u003c\/li\u003e\n\u003cli\u003eMercruiser 99746A3\u003c\/li\u003e\n\u003cli\u003eBarr MC-1-99746\u003c\/li\u003e\n\u003cli\u003eGLM 51220\u003c\/li\u003e\n\u003cli\u003eMallory 9-40505\u003c\/li\u003e\n\u003cli\u003eOsco 9745\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1952-1 exhaust manifold fit?\u003c\/strong\u003e The 18-1952-1 fits MCM GM V-6 229 and 262 cid engines built between 1985 and 2002.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1952-1 fit both the port and starboard side?\u003c\/strong\u003e Yes, this manifold is designed to fit either the port or starboard mounting position, so one part number covers both sides.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM Mercruiser part numbers does this manifold replace?\u003c\/strong\u003e The Sierra 18-1952-1 replaces Mercruiser 99746A8, 99746A17, and 99746A3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre there other aftermarket cross-reference numbers for this part?\u003c\/strong\u003e Yes, the 18-1952-1 also cross-references to Barr MC-1-99746, GLM 51220, Mallory 9-40505, and Osco 9745.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1952-1 exhaust manifold weigh?\u003c\/strong\u003e It weighs 34 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-1952-1 manifold have?\u003c\/strong\u003e It has a machined exterior finish for a precise fit against the cylinder head and riser assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1952-1 come with mounting hardware?\u003c\/strong\u003e Yes, the Sierra 18-1952-1 is supplied with a mounting package for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1952-1 a genuine Mercruiser part or an aftermarket equivalent?\u003c\/strong\u003e The 18-1952-1 is a Sierra-manufactured aftermarket manifold built to meet or exceed the specifications of the OEM Mercruiser 99746A8 and 99746A17 manifolds it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-1952-1 work with my riser and elbow assembly?\u003c\/strong\u003e The 18-1952-1 manifold is compatible with standard riser elbow and gasket components used on MCM GM V-6 229 and 262 cid engine setups; confirm your specific riser and elbow part numbers before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-1952-1 and a used OEM manifold?\u003c\/strong\u003e The 18-1952-1 is a new manifold manufactured to meet or exceed OEM specifications, offering consistent fit and finish compared to a used factory manifold that may show wear or corrosion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to order a separate manifold for each side of the engine?\u003c\/strong\u003e No, because the 18-1952-1 fits either the port or starboard side, the same part number can be used on both sides of a V-6 engine that requires this manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1952-1 include the manifold gasket?\u003c\/strong\u003e The listing for 18-1952-1 confirms it ships with a mounting package; gaskets specific to your riser and elbow combination should be selected separately based on that hardware.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089417947,"sku":"SIE-18-1952-1","price":354.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__46118.1753840674.500.750.jpg?v=1785188893"},{"product_id":"sierra-18-1953-2-marine-exhaust-manifold-replaces-mercruiser-87114a19-for-gm-v8-305-350-cu-in-models-200-228-230-260-898","title":"Sierra Exhaust Manifold 18-1953-2 for GM V-8 305\/350\/377 cid MCM\/MIE Marine Engines","description":"\u003cp\u003eThis Sierra exhaust manifold, part number 18-1953-2, is built for GM V-8 305, 350, and 377 cid MCM\/MIE marine engines (1983-2002). It routes hot exhaust gases away from the engine block and mixes them with cooling water before they exit through the riser and elbow assembly, protecting the engine from heat damage while running. The manifold is a universal fit that installs on either the port or starboard side of the engine, so one part number covers both mounting locations.\u003c\/p\u003e\u003cp\u003eThe manifold pairs with a specific set of Sierra components to complete the exhaust path. It accepts either the 18-1974-1 elbow (3 inch hose, 0 degree down angle) or the 18-1976-2 elbow (4 inch hose, 7 degree down angle), sealed with elbow gasket 18-2849-1, 18-0897, or 18-0672. For installations that need additional height, the manifold works with the 18-1908 three-inch spacer or the 18-1985 six-inch spacer, each requiring its own mounting kit. Sierra engineers this manifold to meet or exceed the performance of the original equipment part it replaces, and it is backed by a limited warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1953-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282195151\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 49.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e GM V-8 305, 350, and 377 cid MCM\/MIE marine engines (1983-2002)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSide:\u003c\/strong\u003e Port and starboard (universal fit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Elbow (3 inch hose):\u003c\/strong\u003e 18-1974-1, 0 degree down angle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Elbow (4 inch hose):\u003c\/strong\u003e 18-1976-2, 7 degree down angle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Spacer (3 inch):\u003c\/strong\u003e 18-1908\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Spacer (6 inch):\u003c\/strong\u003e 18-1985\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Elbow Gasket:\u003c\/strong\u003e 18-2849-1, 18-0897, or 18-0672\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM V-8 305, 350, and 377 cid MCM\/MIE marine engines (1983-2002)\u003c\/li\u003e\n\u003cli\u003eFits both port and starboard mounting positions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1953-2 exhaust manifold fit?\u003c\/strong\u003e The 18-1953-2 manifold is built for GM V-8 305, 350, and 377 cid MCM\/MIE marine engines (1983-2002).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-1953-2 fit both port and starboard sides?\u003c\/strong\u003e Yes, the Sierra 18-1953-2 manifold is a universal fit that installs on either the port or starboard side of the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this exhaust manifold weigh?\u003c\/strong\u003e The Sierra 18-1953-2 exhaust manifold weighs 49.1 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich elbow works with the 18-1953-2 manifold?\u003c\/strong\u003e Two elbow options fit this manifold: the 18-1974-1 (3 inch hose, 0 degree down angle) and the 18-1976-2 (4 inch hose, 7 degree down angle).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gasket do I need to seal the elbow to the 18-1953-2 manifold?\u003c\/strong\u003e Elbow gasket 18-2849-1, 18-0897, or 18-0672 is used to seal the elbow to this manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I raise the riser height on this manifold?\u003c\/strong\u003e Yes, the 18-1953-2 manifold accepts a 3 inch spacer (18-1908) or a 6 inch spacer (18-1985) for additional riser height, each requiring its own mounting kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a mounting kit included with the manifold?\u003c\/strong\u003e The manifold itself is the exhaust manifold casting; mounting kits for the elbow and spacer combinations are separate components matched to the elbow chosen.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-1953-2 is a genuine Sierra part, engineered to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer part number for this manifold?\u003c\/strong\u003e The manufacturer part number is 18-1953-2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this manifold come with a warranty?\u003c\/strong\u003e The Sierra 18-1953-2 exhaust manifold is backed by a limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089450715,"sku":"SIE-18-1953-2","price":315.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1953-2__05081.1737866868.500.750.jpg?v=1785189050"},{"product_id":"sierra-18-1966-1-exhaust-manifold-for-mercruiser-3-0l-lx-1990-newer-replaces-oem-806867a2","title":"Sierra 18-1966-1 Manifold, Replaces 806867A2, Fits Mercruiser 3.0L\/LX 1990 \u0026 Newer","description":"\u003cp\u003eThe Sierra 18-1966-1 is a manifold engineered as a direct OE replacement for Mercruiser 3.0L\/LX inboard\/outboard engines built 1990 and newer, as well as the Marine Power Engine Model E181S. It is designed to be fully interchangeable with the original equipment manifolds it replaces, so it bolts in using the same mounting points and connections as the factory part it is standing in for. The manifold arrives primed and painted, giving it a layer of corrosion protection for the marine engine compartment environment, and it is ready to install straight out of the box without additional prep work. This makes it a straightforward swap for boat owners and marine technicians replacing a cracked, corroded, or failed manifold on a 3.0L\/LX Mercruiser I\/O powerplant. At 49 pounds, it matches the weight profile of the OEM manifold it is built to replace, and it is finished in black to match typical engine hardware. Because it carries the same Sierra part number system used across the marine aftermarket, it cross-references directly to the OEM numbers used to identify the original Mercruiser manifold, helping buyers confirm compatibility before ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1966-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercruiser 3.0L\/LX (1990 \u0026amp; Newer); Marine Power Engine Model E181S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 49 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 manifold per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282371456\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 3.0L\/LX (1990 \u0026amp; Newer)\u003c\/li\u003e\n\u003cli\u003eMarine Power Engine Model E181S\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e806867A2\u003c\/li\u003e\n\u003cli\u003e806867A3\u003c\/li\u003e\n\u003cli\u003e806867A8\u003c\/li\u003e\n\u003cli\u003e806867A9\u003c\/li\u003e\n\u003cli\u003e806867A12\u003c\/li\u003e\n\u003cli\u003e816329A3\u003c\/li\u003e\n\u003cli\u003e860235A03\u003c\/li\u003e\n\u003cli\u003e99798A18\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1966-1 manifold fit?\u003c\/strong\u003e The 18-1966-1 fits Mercruiser 3.0L\/LX engines built 1990 and newer, as well as the Marine Power Engine Model E181S.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1966-1 a direct OEM replacement?\u003c\/strong\u003e Yes, this manifold is manufactured as a direct OE replacement and is fully interchangeable with the original equipment manifolds it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-1966-1 cross-reference to?\u003c\/strong\u003e The 18-1966-1 manifold cross-references OEM numbers 806867A2, 806867A3, 806867A8, 806867A9, 806867A12, 816329A3, 860235A03, and 99798A18.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this manifold weigh?\u003c\/strong\u003e The Sierra 18-1966-1 manifold weighs 49 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the manifold need to be painted before installation?\u003c\/strong\u003e No, the 18-1966-1 arrives primed and painted, so it is ready to install out of the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-1966-1 manifold?\u003c\/strong\u003e It is finished in black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the 18-1966-1 manifold manufactured?\u003c\/strong\u003e The country of origin listed for this manifold is Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many manifolds come in the package?\u003c\/strong\u003e One 18-1966-1 manifold is included per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1966-1 the same as Sierra's 18-1843 exhaust manifold?\u003c\/strong\u003e No, the 18-1966-1 is a distinct part number from the 18-1843 dry-joint exhaust manifold; they carry different OEM cross-references and fit different engine applications, so buyers should confirm they are ordering the part number that matches their specific engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this manifold fit an engine older than 1990?\u003c\/strong\u003e The 18-1966-1 is designated for Mercruiser 3.0L\/LX engines built 1990 and newer, plus the Marine Power Engine Model E181S; fitment outside that range is not specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Mercruiser part or an aftermarket part?\u003c\/strong\u003e The Sierra 18-1966-1 is an aftermarket manifold engineered to be fully interchangeable with the original Mercruiser equipment it replaces.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089483483,"sku":"SIE-18-1966-1","price":584.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1966-1__73035.1737869638.500.750.jpg?v=1785188598"},{"product_id":"sierra-18-1957-2-exhaust-manifold-replaces-mercruiser-807078a6-89011a8-gm-big-block-v8-454-cu-in-7-4l-models-330-340","title":"Sierra 18-1957-2 Exhaust Manifold for Mercruiser Stern Drive Engines (Replaces 89011A8)","description":"\u003cp\u003eThe Sierra 18-1957-2 is an exhaust manifold built for Mercruiser stern drive engines, designed to move spent exhaust gases away from the engine and into the exhaust elbow and riser system while keeping the engine bay running cool and dry. It is manufactured to meet or exceed original equipment quality, giving boat owners a direct, no-compromise replacement for a worn, cracked, or corroded factory manifold. The 18-1957-2 is finished in white and will fit either the port or starboard side of the engine, so it works whichever side needs replacing.\u003c\/p\u003e\u003cp\u003eThis manifold pairs with Sierra's related riser and spacer components, including the 18-1908K manifold spacer kit, which is specifically listed as compatible with the 18-1957-2 and includes spacers, a restrictor, gaskets, and mounting hardware for a complete riser installation. Buyers replacing a manifold on a Mercruiser stern drive engine can order the 18-1957-2 directly using its own part number or any of its Mercruiser OEM cross-reference numbers.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1957-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282371357\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 47.55 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 20.25 x 9.75 x 7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Side:\u003c\/strong\u003e Fits either port or starboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Accessory:\u003c\/strong\u003e 18-1908K Manifold Spacer Kit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser stern drive engines\u003c\/li\u003e\n\u003cli\u003eFits either port or starboard side\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 89011A8\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078A6\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078T10\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078T09\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078A4\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1957-2 manifold fit?\u003c\/strong\u003e The 18-1957-2 is built for Mercruiser stern drive engines and can be installed on either the port or starboard side.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this manifold for port or starboard?\u003c\/strong\u003e The Sierra 18-1957-2 fits either port or starboard, so the same part number works on both sides of the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercruiser OEM numbers does the 18-1957-2 replace?\u003c\/strong\u003e It replaces Mercruiser 89011A8, 807078A6, 807078T10, 807078T09, 807078A4, and 807078A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1957-2 exhaust manifold weigh?\u003c\/strong\u003e It weighs 47.55 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-1957-2 manifold?\u003c\/strong\u003e The packaged dimensions of the Sierra 18-1957-2 manifold are 20.25 x 9.75 x 7 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-1957-2 manifold?\u003c\/strong\u003e The Sierra 18-1957-2 exhaust manifold is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1957-2 an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket manifold made to meet or exceed original equipment quality, sold under Sierra's own part number 18-1957-2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1957-2 come with mounting hardware or gaskets?\u003c\/strong\u003e The manifold itself includes only the manifold; mounting hardware and gaskets for the riser connection are supplied separately in the 18-1908K manifold spacer kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the box with this manifold?\u003c\/strong\u003e The Sierra 18-1957-2 ships as a single manifold unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-1908K spacer kit be used with the 18-1957-2 manifold?\u003c\/strong\u003e Yes, the 18-1908K manifold spacer kit is specifically listed as compatible with the 18-1957-2 and includes spacers, a restrictor, gaskets, and mounting hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the Sierra 18-1957-2 different from a used or reconditioned manifold?\u003c\/strong\u003e The 18-1957-2 is a new manifold manufactured to meet or exceed original equipment quality, rather than a rebuilt or salvaged unit.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089549019,"sku":"SIE-18-1957-2","price":345.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__56703.1753840675.500.750.jpg?v=1785188469"},{"product_id":"sierra-18-1986-1-exhaust-manifold-replaces-oem-3857723-fits-gm-small-block-v8-305-350-cu-in","title":"Sierra Exhaust Manifold 18-1986-2, Replaces OE 3857723, Fits GM Small Block V8 305-350 cid","description":"\u003cp\u003eThe Sierra Exhaust Manifold 18-1986-2 is a cast iron marine exhaust manifold engineered for GM Small Block V8 engines in the 305 to 350 cubic inch range, a common power plant configuration in stern-drive and inboard boat applications. Exhaust manifolds route hot exhaust gases away from the engine block while providing the water-jacketed cooling passages marine engines require to keep exhaust components safe to operate near fuel, bilge, and crew areas. This manifold is built to meet or exceed the performance of the original equipment part it replaces, using cast iron construction for the strength and heat tolerance the marine exhaust environment demands.\u003c\/p\u003e\u003cp\u003eThis manifold pairs with the corresponding manifold gasket and mounting kit for a complete installation, so buyers replacing an aging or cracked manifold can source the matching hardware at the same time. It is designed as a direct fit for GM Small Block V8 305-350 cid engines, making it a straightforward swap for boat owners maintaining stern-drive and inboard exhaust systems.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1986-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Application:\u003c\/strong\u003e GM Small Block V8 305-350 cu in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 3857723\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifold Gasket:\u003c\/strong\u003e 18-2949\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Mounting Kit:\u003c\/strong\u003e 18-8502\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 40.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282391232\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM Small Block V8, 305-350 cubic inch engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3857723\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1986-2 exhaust manifold fit?\u003c\/strong\u003e The 18-1986-2 manifold is built for GM Small Block V8 engines in the 305 to 350 cubic inch range, a common configuration in stern-drive and inboard marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this manifold cross-reference?\u003c\/strong\u003e It cross-references OEM number 3857723, so if your original manifold carries that number, the 18-1986-2 is a direct equivalent.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1986-2 manifold weigh?\u003c\/strong\u003e This exhaust manifold weighs 40.1 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the manifold made of?\u003c\/strong\u003e The 18-1986-2 is made of cast iron, chosen for its strength and heat resistance in the marine exhaust environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a separate gasket to install this manifold?\u003c\/strong\u003e Yes, the 18-1986-2 manifold is installed with manifold gasket 18-2949, which is sold separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a mounting kit required for installation?\u003c\/strong\u003e Installation uses mounting kit 18-8502 alongside the 18-1986-2 manifold and its gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-1986-2 is a genuine Sierra manifold engineered to meet or exceed the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the box with this manifold?\u003c\/strong\u003e The package includes the 18-1986-2 cast iron exhaust manifold; the manifold gasket (18-2949) and mounting kit (18-8502) are separate items.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this manifold work with other engine sizes besides 305-350 cid?\u003c\/strong\u003e The 18-1986-2 is specified for GM Small Block V8 engines in the 305 to 350 cubic inch range; it is not listed for other displacements.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace my exhaust manifold?\u003c\/strong\u003e Marine exhaust manifolds like the 18-1986-2 are commonly replaced when the original develops cracks, corrosion, or coolant leaks from age and constant heat cycling.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089614555,"sku":"SIE-18-1986-2","price":399.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1986_lg__16636.1733495359.500.750.jpg?v=1785188062"},{"product_id":"sierra-18-1976-2-manifold-exhaust-elbow-4in-hose-7-degree-down-angle-replaces-mercury-44354a3-fits-manifold-18-1957-2-mercruiser","title":"Sierra Manifold Elbow 18-1976-2, Replaces Mercury Marine 44354A3, 807914A1, Fits 18-1953-2 Manifold, 4 Inch Hose, 7 Degree Down Angle","description":"\u003cp\u003eThe Sierra 18-1976-2 Manifold Elbow is a 4 inch hose, 7 degree down angle exhaust manifold elbow built to fit the 18-1953-2 exhaust manifold. It directs exhaust flow from the manifold to the connected exhaust hose at the correct angle for proper drainage and reliable engine cooling water discharge, replacing worn or corroded factory elbows that can leak exhaust or coolant.\u003c\/p\u003e\u003cp\u003eThis elbow is a direct cross-reference for Mercury Marine 44354A3 and 807914A1, so it installs as a like-for-like replacement without modification. It is finished in black and is designed to pair with the correct elbow gasket for a sealed connection at the manifold. Sierra recommends using elbow gasket 18-2849-1 or 18-0897 with this elbow, and the matching 18-8505 mounting kit (sold separately) includes an 18-0897 elbow gasket specifically for use with this riser.\u003c\/p\u003e\u003cp\u003eEach unit ships as a single elbow (1 pack), intended for engine and drive system repair and maintenance work where the original manifold elbow has failed or is due for preventive replacement.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1976-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Manifold Elbow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Connection Size:\u003c\/strong\u003e 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAngle:\u003c\/strong\u003e 7 degree down angle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Manifold:\u003c\/strong\u003e 18-1953-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Elbow Gaskets:\u003c\/strong\u003e 18-2849-1, 18-0897\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 25 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282325664\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Exhaust Manifolds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eFits Manifold: 18-1953-2\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 44354A3\u003c\/li\u003e\n\u003cli\u003eMercury Marine 807914A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1976-2 manifold elbow fit?\u003c\/strong\u003e The 18-1976-2 manifold elbow is designed to fit the 18-1953-2 exhaust manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-1976-2 a direct replacement for Mercury Marine 44354A3?\u003c\/strong\u003e Yes, 18-1976-2 directly cross-references to Mercury Marine part numbers 44354A3 and 807914A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat hose size does this elbow use?\u003c\/strong\u003e This manifold elbow is built for a 4 inch hose connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat angle is the 18-1976-2 elbow?\u003c\/strong\u003e It is a 7 degree down angle elbow, distinct from other Sierra manifold elbows offered at different angles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1976-2 manifold elbow weigh?\u003c\/strong\u003e The Sierra 18-1976-2 manifold elbow weighs 25 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gasket should be used with the 18-1976-2 elbow?\u003c\/strong\u003e Elbow gasket 18-2849-1 or 18-0897 is compatible with the 18-1976-2 manifold elbow; the 18-8505 mounting kit for this riser also includes an 18-0897 gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1976-2 elbow come with mounting hardware?\u003c\/strong\u003e No, the 18-1976-2 is the elbow only; mounting hardware and gaskets are supplied separately in mounting kit 18-8505.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-1976-2 manifold elbow?\u003c\/strong\u003e It is finished in black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many elbows come in one order?\u003c\/strong\u003e Each order of the 18-1976-2 manifold elbow contains a single unit (1 pack).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1976-2 elbow genuine OEM or aftermarket?\u003c\/strong\u003e The 18-1976-2 is a Sierra-manufactured aftermarket part engineered to replace Mercury Marine 44354A3 and 807914A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between 18-1976-2 and 18-1974-1?\u003c\/strong\u003e 18-1976-2 is a 4 inch hose, 7 degree down angle elbow for the 18-1953-2 manifold, while 18-1974-1 is a 3 inch hose, 0 degree down angle elbow for the same manifold; they use different mounting kits and are not interchangeable.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089680091,"sku":"SIE-18-1976-2","price":208.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sie-18-1976-2__30245.1727894429.500.750.jpg?v=1785189189"},{"product_id":"sierra-18-1998-1-exhaust-manifold-replaces-barr-fm-1-83-universal-center-riser-for-crusader-302-351-cid-port-starboard","title":"Sierra 18-1998-1 Exhaust Manifold, White, Cross-Reference Barr FM-1-83","description":"\u003cp\u003eThe Sierra 18-1998-1 is a marine exhaust manifold finished in white with a machined exterior, engineered as a direct replacement for worn or corroded factory manifolds. Exhaust manifolds route hot exhaust gases away from the engine block while a surrounding water jacket cools the exhaust and the engine, and a compromised manifold can lead to overheating, exhaust leaks, or water intrusion into the engine. The Sierra 18-1998-1 is built to restore that cooling and exhaust path with OEM-equivalent fit and function.\u003c\/p\u003e\u003cp\u003eThis manifold is designed to work with the Sierra 18-2854-1 elbow gasket for open riser setups or the 18-0476-1 elbow gasket for blocked riser setups, and pairs with the Sierra 18-1949 manifold spacer. It is cross-referenced to Barr FM-1-83, FM183, GLM 56250, Mallory 9-40111, Osco FL994, and Osco FLCR818, making it a suitable replacement wherever those part numbers are specified. The kit includes an exhaust elbow gasket, an 18-0183-1 exhaust manifold gasket, and an 18-4258 pipe plug, giving installers the gaskets and hardware needed to complete the swap without sourcing separate gasket kits.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1998-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 36.11 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282243340\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e PleasureCraft Exhaust Manifolds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Riser Gasket (Open):\u003c\/strong\u003e 18-2854-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Riser Gasket (Blocked):\u003c\/strong\u003e 18-0476-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifold Spacer:\u003c\/strong\u003e 18-1949\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Exhaust elbow gasket, 18-0183-1 exhaust manifold gasket, 18-4258 pipe plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBarr FM-1-83\u003c\/li\u003e\n\u003cli\u003eFM183\u003c\/li\u003e\n\u003cli\u003eGLM 56250\u003c\/li\u003e\n\u003cli\u003eMallory 9-40111\u003c\/li\u003e\n\u003cli\u003eOsco FL994\u003c\/li\u003e\n\u003cli\u003eFLCR818\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1998-1 manifold replace?\u003c\/strong\u003e The Sierra 18-1998-1 exhaust manifold is cross-referenced to Barr FM-1-83, FM183, GLM 56250, Mallory 9-40111, Osco FL994, and FLCR818, so any of those part numbers can be replaced with this manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and finish does this manifold come in?\u003c\/strong\u003e It comes in white with a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1998-1 weigh?\u003c\/strong\u003e The manifold weighs 36.11 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gaskets are needed to install the 18-1998-1 manifold?\u003c\/strong\u003e Use the Sierra 18-2854-1 elbow gasket for an open riser setup or the 18-0476-1 elbow gasket for a blocked riser setup with the 18-1998-1 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the manifold come with any gaskets or hardware included?\u003c\/strong\u003e Yes, the 18-1998-1 kit includes an exhaust elbow gasket, an 18-0183-1 exhaust manifold gasket, and an 18-4258 pipe plug.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a manifold spacer required with this part?\u003c\/strong\u003e The 18-1998-1 manifold is designed to work with the Sierra 18-1949 manifold spacer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1998-1 an OEM or aftermarket part?\u003c\/strong\u003e The 18-1998-1 is a Sierra-manufactured manifold built as a direct cross-reference replacement for Barr FM-1-83 and the other listed OEM equivalents, rather than a part sourced from the original engine builder.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the exhaust elbow gasket used with the 18-1998-1 called?\u003c\/strong\u003e The open-configuration elbow gasket paired with the 18-1998-1 manifold is the 18-2854-1; the blocked-configuration version is the 18-0476-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this manifold be used with a blocked riser configuration?\u003c\/strong\u003e Yes, when running a blocked riser setup, pair the 18-1998-1 manifold with the 18-0476-1 elbow gasket instead of the open-configuration 18-2854-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the listed dimensions of the 18-1998-1 manifold package?\u003c\/strong\u003e The Sierra 18-1998-1 is listed at 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-1998-1 manifold?\u003c\/strong\u003e The UPC for the Sierra 18-1998-1 manifold is 808282243340.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090237147,"sku":"SIE-18-1998-1","price":378.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1998-1__48585.1722518483.500.750.jpg?v=1785189121"},{"product_id":"sierra-18-1997-1-center-riser-marine-exhaust-manifold-replaces-barr-fm-1-83-fits-omc-pleasurecraft-volvo-283-350-cid-gm-v8-1968-1980","title":"Sierra 18-1997-1 Cast Iron Exhaust Manifold - Fits OMC, Pleasurecraft GM \u0026 Volvo 283-350 CID Engines, Replaces GLM 56230","description":"\u003cp\u003eThe Sierra 18-1997-1 is a cast iron exhaust manifold built for marine inboard and sterndrive engines that route exhaust through a center riser configuration. As the manifold carries hot exhaust gases away from the engine block and up to the riser, it has to hold up to constant heat cycling and marine moisture without cracking or corroding at the mounting flange, which is why Sierra builds this manifold from cast iron rather than lighter stamped alternatives. This manifold is designed as a direct fit for OMC 283, 305, 307 and 350 CID engines built between 1968 and 1980, Pleasurecraft GM 283, 305, 307 and 350 CID engines, and Volvo 307 and 350 CID engines, covering a wide range of small-block V8 marine powerplants that share this exhaust manifold bolt pattern and riser interface. It is finished in white and is sold as a standalone manifold, so it pairs with the matching riser, mounting kit, and gasket set for a complete exhaust rebuild rather than including those components itself. Boat owners typically replace an exhaust manifold like the 18-1997-1 when the original has cracked, rusted through, or is leaking exhaust or water due to age and salt\/fresh water exposure. Because it is manufactured to the same form, fit, and function as the original equipment manifold it replaces, it bolts up using the existing mounting hardware and gasket set without modification.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1997-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\/Finish:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal Fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 36.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282243333\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e GLM 56230, Mallory 9-40110, Osco 994\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC 283, 305, 307 \u0026amp; 350 CID engines, 1968-1980\u003c\/li\u003e\n\u003cli\u003ePleasurecraft GM 283, 305, 307 \u0026amp; 350 CID engines\u003c\/li\u003e\n\u003cli\u003eVolvo 307 \u0026amp; 350 CID engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 56230\u003c\/li\u003e\n\u003cli\u003eMallory 9-40110\u003c\/li\u003e\n\u003cli\u003eOsco 994\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1997-1 exhaust manifold fit?\u003c\/strong\u003e The Sierra 18-1997-1 fits OMC 283, 305, 307 and 350 CID engines built from 1968 to 1980, Pleasurecraft GM 283, 305, 307 and 350 CID engines, and Volvo 307 and 350 CID engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1997-1 manifold the same as GLM 56230 or Mallory 9-40110?\u003c\/strong\u003e Yes, the Sierra 18-1997-1 exhaust manifold is interchangeable with GLM 56230, Mallory 9-40110, and Osco 994, so any of those part numbers point to the same fit and function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is this exhaust manifold made from?\u003c\/strong\u003e It is cast iron, chosen for its ability to withstand the heat cycling and corrosion exposure of a marine exhaust system over years of use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1997-1 come with mounting hardware or gaskets?\u003c\/strong\u003e No, the Sierra 18-1997-1 is sold as the manifold only; a matching riser, mounting kit, and gasket set are needed separately to complete an exhaust rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1997-1 manifold weigh?\u003c\/strong\u003e This cast iron exhaust manifold weighs 36.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-1997-1 manifold?\u003c\/strong\u003e The manifold has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace an exhaust manifold like the 18-1997-1?\u003c\/strong\u003e A center riser manifold such as the 18-1997-1 typically gets replaced when the original cast iron manifold has cracked, corroded, or developed an exhaust or water leak from age and water exposure, since these manifolds see constant heat and moisture cycling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1997-1 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-1997-1 is a Sierra manifold manufactured to match the fit, form, and function of the original equipment manifold it replaces on OMC, Pleasurecraft GM, and Volvo small-block engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this manifold be used on both OMC and Volvo powered boats?\u003c\/strong\u003e Yes, the same Sierra 18-1997-1 manifold is designed to fit OMC 283-350 CID engines (1968-1980), Pleasurecraft GM 283-350 CID engines, and Volvo 307 and 350 CID engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the manufacturer part number for this exhaust manifold?\u003c\/strong\u003e The manufacturer part number is 18-1997-1, made by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-1997-1 require a specific gasket set?\u003c\/strong\u003e The manifold works with the exhaust gaskets and mounting kits designed for its riser interface; consult your engine's exhaust system parts to match the correct gasket set for the 18-1997-1.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090335451,"sku":"SIE-18-1997-1","price":367.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1997-1__55776.1727713188.500.750.jpg?v=1785188518"},{"product_id":"sierra-18-2500-9-exhaust-cover-gasket-replaces-mercury-27-85490-2-fits-35-40-hp-outboards-2-pack","title":"Sierra 18-2500-9 Exhaust Cover Gasket, Replaces Mercury 27-85493, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2500-9 Exhaust Cover Gasket is a round, multi-colored gasket engineered to seal the exhaust cover on applicable Mercury outboard engines, sold in a pack of 2 so both sides can be replaced together. It is built to meet or exceed the quality of the original equipment part it replaces, giving installers a dependable seal against exhaust gas and water leakage at the cover joint. Each gasket is manufactured by Sierra International, a long-established supplier of marine replacement parts, and is cross-referenced to GLM 32010 and Mercury part numbers 27-85493, 27-52893, and 27-72505, making it straightforward to match against the OEM part being replaced. Because gaskets compress and lose their sealing ability over time and with repeated heat cycling, replacing the exhaust cover gasket during routine maintenance or whenever the exhaust cover is removed helps prevent leaks and corrosion around the cover mounting surface. At 0.32 pounds for the pack, this is a lightweight, low-cost maintenance item worth keeping on hand for outboard servicing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2500-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.32 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Multi-colored\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282162481\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 32010\u003c\/li\u003e\n\u003cli\u003eMercury 27-85493\u003c\/li\u003e\n\u003cli\u003eMercury 27-52893\u003c\/li\u003e\n\u003cli\u003eMercury 27-72505\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2500-9 Exhaust Cover Gasket fit?\u003c\/strong\u003e The Sierra 18-2500-9 is designed as a replacement exhaust cover gasket for Mercury outboard engines that originally used Mercury gasket numbers 27-85493, 27-52893, or 27-72505.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2500-9 the same as GLM 32010?\u003c\/strong\u003e Yes, GLM 32010 is a cross-referenced equivalent to the Sierra 18-2500-9 Exhaust Cover Gasket, so either number can be used to identify the same part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a pack of the 18-2500-9?\u003c\/strong\u003e Each pack of the Sierra 18-2500-9 Exhaust Cover Gasket contains 2 gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercury part numbers does the 18-2500-9 replace?\u003c\/strong\u003e It replaces Mercury 27-85493, Mercury 27-52893, and Mercury 27-72505.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the exhaust cover gasket pack weigh?\u003c\/strong\u003e The Sierra 18-2500-9 pack of 2 gaskets weighs 0.32 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape and color is the 18-2500-9 gasket?\u003c\/strong\u003e The Sierra 18-2500-9 Exhaust Cover Gasket is round and multi-colored.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2500-9 a genuine Mercury part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-branded aftermarket replacement gasket, manufactured to meet or exceed the quality of the original Mercury equipment it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the exhaust cover gasket on my outboard?\u003c\/strong\u003e The exhaust cover gasket should be replaced whenever the exhaust cover is removed for service, or if you notice leaking at the cover joint, since the Sierra 18-2500-9 gasket loses its seal after removal or extended heat exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2500-9?\u003c\/strong\u003e An order of the Sierra 18-2500-9 includes a pack of 2 Exhaust Cover Gaskets, sized for a complete replacement in a single service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2500-9 come with installation hardware?\u003c\/strong\u003e No, the Sierra 18-2500-9 pack contains only the 2 exhaust cover gaskets; it does not include bolts or other hardware.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988106883291,"sku":"SIE-18-2500-9","price":8.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sierra_lg_1128__45954.1558122009.500.750.jpg?v=1785189094"},{"product_id":"exhaust-cover-gasket-for-mercury-15-25-hp-2-cylinder-outboards-replaces-27-414995-sierra-18-2714","title":"Sierra Exhaust Cover Gasket 18-2714, Replaces 27-414995, for 15-25 HP 2 Cyl Outboards","description":"\u003cp\u003eThe Sierra 18-2714 Exhaust Cover Gasket is a replacement gasket designed to seal the exhaust cover on 15-25 HP, 2 cylinder outboard engines. It creates the seal needed between the exhaust cover and powerhead to prevent exhaust leaks and maintain proper engine sealing during operation. As a direct replacement part, it is sized and shaped to match the original equipment gasket it replaces, allowing for a straightforward swap during routine maintenance or when servicing the exhaust cover assembly. Keeping this gasket in good condition is important for preventing exhaust gas or water leaks at the cover joint, which can affect engine performance and longevity. This gasket is intended for one-time use during installation; once removed, the original gasket should not be reused, and a new Sierra 18-2714 should be installed to ensure a proper seal. It is a lightweight, compact component at 0.02 pounds, making it an inexpensive but essential part of a complete exhaust cover service. Boat owners and marine technicians performing exhaust cover maintenance, gasket replacement during a rebuild, or troubleshooting an exhaust leak on a compatible 15-25 HP, 2 cylinder outboard will find this gasket to be the correct fit for the job.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2714\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Exhaust Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e 15-25 HP, 2 Cyl.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282145293\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e15-25 HP, 2 Cyl. Outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-414995\u003c\/li\u003e\n\u003cli\u003e27-414994\u003c\/li\u003e\n\u003cli\u003e27-414993\u003c\/li\u003e\n\u003cli\u003e27-414992\u003c\/li\u003e\n\u003cli\u003e27-892157\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2714 gasket fit?\u003c\/strong\u003e The Sierra 18-2714 Exhaust Cover Gasket is designed for 15-25 HP, 2 cylinder outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2714 a direct OEM replacement?\u003c\/strong\u003e Yes, the 18-2714 is a direct replacement gasket that fits in place of OEM exhaust cover gaskets 27-414995, 27-414994, 27-414993, 27-414992, and 27-892157.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does 18-2714 cross-reference to?\u003c\/strong\u003e This gasket replaces OEM numbers 27-414995, 27-414994, 27-414993, 27-414992, and 27-892157.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2714 exhaust cover gasket weigh?\u003c\/strong\u003e The Sierra 18-2714 weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the exhaust cover gasket be reused after removal?\u003c\/strong\u003e No, gaskets like the Sierra 18-2714 are designed for one-time use; a new gasket should be installed any time the exhaust cover is removed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the 18-2714 gasket installed on the engine?\u003c\/strong\u003e It seals the joint between the exhaust cover and the powerhead on compatible 15-25 HP, 2 cylinder outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the exhaust cover gasket?\u003c\/strong\u003e A worn or damaged exhaust cover gasket can allow exhaust gas or water to leak at the cover joint, so the Sierra 18-2714 is used to restore a proper seal during maintenance or repair.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-2714 is a Sierra-branded gasket manufactured as a replacement part for the listed OEM numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-2714?\u003c\/strong\u003e Ordering Sierra 18-2714 includes one exhaust cover gasket sized for 15-25 HP, 2 cylinder outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2714 gasket require any special tools to install?\u003c\/strong\u003e Installing the Sierra 18-2714 gasket is a standard gasket replacement during exhaust cover removal, typically requiring only basic hand tools to access the cover fasteners.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988109275355,"sku":"SIE-18-2714","price":6.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2714_lg__93038.1558122446.500.750.jpg?v=1785329157"},{"product_id":"exhaust-manifold-gasket-for-mercury-15-25hp-2-cylinder-outboards-replaces-27-892158-sierra-18-2717-mpn-118-2717","title":"Sierra Exhaust Manifold Gasket 18-2717 for Mercury Outboard","description":"\u003cp\u003eThe Sierra 18-2717 is an exhaust manifold gasket engineered for Mercury outboard engines. It seals the mating surface between the exhaust manifold and the powerhead, maintaining a tight seal against combustion gases and cooling water to prevent leaks that can lead to overheating, corrosion, or loss of engine performance. As a direct-fit replacement part, it is designed to restore the factory seal when servicing or rebuilding the exhaust manifold assembly on compatible Mercury outboard engines.\u003c\/p\u003e\u003cp\u003eInstalling a fresh gasket at this joint is a routine part of exhaust manifold maintenance, especially any time the manifold is removed for inspection, cleaning, or replacement. Using the correct gasket helps ensure proper sealing and reduces the risk of exhaust or water leaks that can damage surrounding engine components over time.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2717\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Exhaust Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282145811\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2717 used for?\u003c\/strong\u003e The Sierra 18-2717 is an exhaust manifold gasket that seals the joint between the exhaust manifold and the powerhead on a Mercury outboard engine, preventing exhaust and water leaks at that connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does the 18-2717 gasket fit?\u003c\/strong\u003e The 18-2717 is designated for Mercury outboard engines; check your engine's manifold part number to confirm compatibility before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2717 exhaust manifold gasket weigh?\u003c\/strong\u003e This gasket weighs 0.05 pounds, consistent with its role as a thin sealing component rather than a structural part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2717 a genuine Sierra part?\u003c\/strong\u003e Yes, part number 18-2717 is a Sierra branded exhaust manifold gasket, sold under the Sierra name for marine engine service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the exhaust manifold gasket on my Mercury outboard?\u003c\/strong\u003e The 18-2717 gasket should be replaced any time the exhaust manifold is removed for service, or if you notice exhaust or water leakage at the manifold joint, since gaskets are single-use seals that should not be reused.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2717?\u003c\/strong\u003e Ordering the Sierra 18-2717 gets you one exhaust manifold gasket sized for the mating surface between the manifold and the powerhead on applicable Mercury outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2717 gasket be reused after removal?\u003c\/strong\u003e No, like most engine gaskets, the 18-2717 is intended for one-time use and should be replaced with a new gasket whenever the exhaust manifold is disassembled.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if I don't replace a worn exhaust manifold gasket?\u003c\/strong\u003e A worn or damaged gasket at the exhaust manifold joint, such as where the 18-2717 seals, can allow exhaust gas or cooling water to leak, potentially leading to overheating or corrosion of nearby engine components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2717 gasket specific to Mercury outboards?\u003c\/strong\u003e Yes, the Sierra 18-2717 is categorized as a Mercury outboard gasket, made for the exhaust manifold sealing point on Mercury outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I identify if I need the 18-2717 gasket?\u003c\/strong\u003e If you are servicing the exhaust manifold on a Mercury outboard and need a replacement seal for that mating surface, the Sierra 18-2717 is the gasket designated for that job.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988109504731,"sku":"SIE-18-2717","price":5.84,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/1__73222.1753840677.500.750.png?v=1785329159"},{"product_id":"sierra-18-2741-exhaust-cover-plate-gasket-replaces-mercury-27-430047-mercury-outboard-gaskets","title":"Sierra Exhaust Cover Plate Gasket 18-2741 for Mercury Outboard Engines","description":"\u003cp\u003eThe Sierra Exhaust Cover Plate Gasket, part number 18-2741, is a replacement gasket designed to seal the exhaust cover plate on Mercury outboard engines. It creates a tight, leak-free seal between the exhaust cover plate and the engine housing, helping to prevent exhaust gas and water leakage at this joint during operation. The gasket is round in shape and finished in a multi-colored appearance typical of composite gasket material construction.\u003c\/p\u003e\u003cp\u003eThis is a single-piece gasket sold individually, intended as a direct maintenance replacement part for the exhaust cover plate assembly on applicable Mercury outboard engines. Because gaskets compress and can lose their sealing ability over time or after a cover plate has been removed for service, replacing the gasket with a new Sierra 18-2741 whenever the exhaust cover plate is taken off helps maintain a proper seal and avoid leaks.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2741\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Cover Plate Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Multi-Colored\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.16 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282145187\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for use on Mercury outboard engines as an exhaust cover plate gasket.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2741 gasket used for?\u003c\/strong\u003e It is an exhaust cover plate gasket that seals the exhaust cover plate on Mercury outboard engines, part number 18-2741.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2741 gasket sold as a single unit or a kit?\u003c\/strong\u003e The Sierra 18-2741 exhaust cover plate gasket ships as a single gasket, with a unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2741 exhaust cover plate gasket made from?\u003c\/strong\u003e This gasket is made from a glass-composite gasket material and has a multi-colored finish typical of that construction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2741 gasket weigh?\u003c\/strong\u003e It weighs 0.16 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the 18-2741 gasket?\u003c\/strong\u003e It is round in shape, matching the exhaust cover plate opening it seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2741 fit inboard or I\/O engines?\u003c\/strong\u003e The 18-2741 gasket is categorized as a Mercury outboard gasket for the exhaust cover plate application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the exhaust cover plate gasket be replaced?\u003c\/strong\u003e The 18-2741 gasket should be replaced any time the exhaust cover plate is removed for service, since a compressed or disturbed gasket can no longer seal reliably.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2741 a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e 18-2741 is the Sierra brand part number for this exhaust cover plate gasket, manufactured and sold under the Sierra brand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2741 gasket?\u003c\/strong\u003e The UPC for this exhaust cover plate gasket is 808282145187.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2741 gasket leak if reused after removal?\u003c\/strong\u003e Gaskets like the 18-2741 are designed for one-time use; reusing a compressed exhaust cover plate gasket increases the risk of exhaust or water leakage, so a new one is recommended at each cover plate removal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988109635803,"sku":"SIE-18-2741","price":13.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sie-18-2741_lg__41839.1558123745.500.750.jpg?v=1785189077"},{"product_id":"exhaust-housing-gasket-for-johnson-evinrude-5-5-5-6-hp-outboards-replaces-omc-306205-pack-of-2","title":"Sierra 18-2901-9 Exhaust Housing Gasket, Replaces 313065 306205, for Johnson\/Evinrude 5, 5.5, 6 HP Outboards, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2901-9 Exhaust Housing Gasket is a replacement gasket engineered to seal the exhaust housing on Johnson and Evinrude (OMC\/BRP) outboard motors in the 5, 5.5, and 6 HP range. It is sold as a pack of 2, giving you a spare on hand or enough to service two engines in one order. The gasket is designed to restore a tight, leak-free seal at the exhaust housing joint, preventing exhaust gas and water leakage that can occur once the original gasket hardens or compresses with age and heat cycling. As a direct-fit replacement, it is built to the original dimensions and mounting pattern so it installs in the same location as the factory gasket without modification. Sierra manufactures this gasket to meet or exceed the specifications of the original equipment part it replaces, making it a straightforward choice when servicing the exhaust housing during a tune-up, gasket set replacement, or troubleshooting an exhaust leak. It cross-references directly to Johnson\/Evinrude OEM part numbers 313065 and 306205, so it is easy to confirm as the correct part before ordering. This gasket is intended specifically for the 5, 5.5, and 6 HP Johnson\/Evinrude outboard family and is not a universal fit for other horsepower ranges.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2901-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Housing Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Johnson\/Evinrude (OMC\/BRP) Outboard, 5, 5.5, 6 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 313065, 306205\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.09 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282164041\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude (OMC\/BRP) Outboard, 5, 5.5, 6 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e313065\u003c\/li\u003e\n\u003cli\u003e306205\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2901-9 exhaust housing gasket fit?\u003c\/strong\u003e The Sierra 18-2901-9 is designed for Johnson and Evinrude (OMC\/BRP) outboard motors rated 5, 5.5, and 6 HP.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one order of 18-2901-9?\u003c\/strong\u003e Each order of the Sierra 18-2901-9 exhaust housing gasket includes a pack of 2 gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this gasket replace?\u003c\/strong\u003e Sierra 18-2901-9 replaces Johnson\/Evinrude OEM part numbers 313065 and 306205.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2901-9 gasket genuine OEM or aftermarket?\u003c\/strong\u003e It is a Sierra aftermarket replacement gasket, manufactured to meet or exceed the specifications of the original Johnson\/Evinrude equipment part it replaces (313065, 306205).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2901-9 exhaust housing gasket weigh?\u003c\/strong\u003e The Sierra 18-2901-9 exhaust housing gasket weighs 0.09 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the exhaust housing gasket located on the outboard?\u003c\/strong\u003e The 18-2901-9 seals the exhaust housing joint on 5, 5.5, and 6 HP Johnson\/Evinrude outboards to prevent exhaust and water leakage at that connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-2901-9 on a larger horsepower Johnson\/Evinrude outboard?\u003c\/strong\u003e No, the Sierra 18-2901-9 exhaust housing gasket is specified for the 5, 5.5, and 6 HP Johnson\/Evinrude engine family and is not listed as a fit for other horsepower ranges.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any special tools to install this gasket?\u003c\/strong\u003e Installation involves removing the exhaust housing to access the old gasket and fitting the new Sierra 18-2901-9 gasket in its place; no specialty tools beyond standard outboard service tools are indicated for this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2901-9 gasket?\u003c\/strong\u003e The UPC for the Sierra 18-2901-9 exhaust housing gasket, pack of 2, is 808282164041.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the exhaust housing gasket?\u003c\/strong\u003e Exhaust housing gaskets like the Sierra 18-2901-9 can harden or compress over time, leading to exhaust or water leaks at the housing joint, which is when replacement with a fresh gasket set is needed.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132835547,"sku":"SIE-18-2901-9","price":17.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2901-9__53623.1722383205.500.750.jpg?v=1785188169"},{"product_id":"exhaust-housing-gasket-for-johnson-evinrude-35-40-hp-outboard-replaces-oem-310137-sierra-18-2894-9-pack-of-2","title":"Sierra 18-2894-9 Exhaust Housing Gasket, Replaces 304314, Johnson\/Evinrude 35\/40 HP, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2894-9 Exhaust Housing Gasket is a marine engine gasket built for Johnson and Evinrude outboard applications, sized for 35\/40 HP powerheads. It seals the exhaust housing to prevent exhaust leakage and water intrusion at the joint, helping maintain proper exhaust flow and cooling performance. Each package contains two gaskets, giving you a spare on hand or enough to service two units in a single order. This gasket is interchangeable with Johnson\/Evinrude Outboard part number 304314, so it installs as a direct equivalent during a housing rebuild or routine maintenance. Sierra manufactures each gasket to meet or exceed the performance of the original equipment part it replaces, making it a reliable choice for outboard owners and marine technicians performing exhaust housing service. Use it whenever the exhaust housing is disassembled for inspection, cleaning, or repair, since gaskets should always be replaced rather than reused once the housing has been separated.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2894-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Exhaust Housing Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282163990\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson and Evinrude outboards, 35\/40 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e304314\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2894-9 gasket fit?\u003c\/strong\u003e The 18-2894-9 exhaust housing gasket fits Johnson and Evinrude outboards in the 35\/40 HP range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same as Johnson\/Evinrude part 304314?\u003c\/strong\u003e Yes, the Sierra 18-2894-9 is interchangeable with Johnson\/Evinrude Outboard part number 304314.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e Each 18-2894-9 package includes two exhaust housing gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The 18-2894-9 exhaust housing gasket weighs 0.1 pounds per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse the old exhaust housing gasket instead of buying a new one?\u003c\/strong\u003e No, once the exhaust housing has been separated the original gasket should be discarded and replaced with a new Sierra 18-2894-9 gasket to ensure a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2894-9 genuine or aftermarket?\u003c\/strong\u003e The 18-2894-9 is a Sierra-manufactured aftermarket gasket engineered to meet or exceed the performance of the original Johnson\/Evinrude equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e An order of the Sierra 18-2894-9 includes two exhaust housing gaskets, sold as a pair per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket work on any outboard horsepower?\u003c\/strong\u003e No, the 18-2894-9 exhaust housing gasket is designed specifically for Johnson and Evinrude 35\/40 HP outboard applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the exhaust housing gasket?\u003c\/strong\u003e The exhaust housing gasket seals the joint between the exhaust housing and powerhead; a worn or damaged gasket like the original 304314 equivalent can allow exhaust or water leakage, which is when the 18-2894-9 should be installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand makes part number 18-2894-9?\u003c\/strong\u003e Sierra manufactures the 18-2894-9 exhaust housing gasket for Johnson and Evinrude outboards.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132868315,"sku":"SIE-18-2894-9","price":12.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2894-9__60806.1675691685.500.750.jpg?v=1785188152"},{"product_id":"sierra-18-2909-9-exhaust-manifold-gasket-for-gm-v-6-replaces-omc-volvo-penta-3853412-mercruiser-27-99757-pack-of-2","title":"Sierra 18-2909-9 Exhaust Manifold Gasket for GM V6 229 \u0026 262 cu.in Manifold 18-1952-1, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2909-9 Exhaust Manifold Gasket is the gasket specified for Sierra exhaust manifold 18-1952-1, used on GM V6 229 and 262 cubic inch engines in Models 185 and 205 (Port and Starboard). This gasket is also included as part of the 18-8533 mounting kit for that manifold. Each package contains 2 gaskets, giving you enough for a full manifold gasket replacement in one purchase.\u003c\/p\u003e\u003cp\u003eThis gasket forms the seal between the exhaust manifold and the engine block, and proper fit and sealing are critical to preventing exhaust leaks and cooling system issues in your MerCruiser stern drive application. Sierra states that each of its products meets or exceeds the original equipment part it replaces, giving boat owners a dependable option when servicing the cooling and exhaust system.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2909-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.22 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Grey\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282164126\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Manifold:\u003c\/strong\u003e 18-1952-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e GM V6 229 \u0026amp; 262 cu.in, Models 185 \u0026amp; 205 (Port \u0026amp; Starboard)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM V6 229 \u0026amp; 262 cu.in engines\u003c\/li\u003e\n\u003cli\u003eModels 185 \u0026amp; 205 (Port \u0026amp; Starboard)\u003c\/li\u003e\n\u003cli\u003eFits Sierra manifold 18-1952-1\u003c\/li\u003e\n\u003cli\u003eIncluded in Sierra mounting kit 18-8533\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBarr MC47-27-99757\u003c\/li\u003e\n\u003cli\u003eCrusader 97498\u003c\/li\u003e\n\u003cli\u003eGLM 32170\u003c\/li\u003e\n\u003cli\u003eMallory 9-61421\u003c\/li\u003e\n\u003cli\u003eMercruiser Stern Drive 27-99757\u003c\/li\u003e\n\u003cli\u003eOMC Stern Drive 3853412\u003c\/li\u003e\n\u003cli\u003eOMC Stern Drive 901157\u003c\/li\u003e\n\u003cli\u003eOMC Stern Drive 915025\u003c\/li\u003e\n\u003cli\u003eOsco CS-GH\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3853412\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 856116\u003c\/li\u003e\n\u003cli\u003eYamaha Stern Drive YSC-12190-00-AC\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat manifold does the Sierra 18-2909-9 gasket fit?\u003c\/strong\u003e The Sierra 18-2909-9 Exhaust Manifold Gasket is the gasket specified for Sierra manifold 18-1952-1, which is used on GM V6 229 and 262 cubic inch engines in Models 185 and 205, Port and Starboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e Each package of the Sierra 18-2909-9 contains 2 exhaust manifold gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket fit both port and starboard manifolds?\u003c\/strong\u003e Yes, the 18-2909-9 is the gasket used for manifold 18-1952-1 on both the Port and Starboard sides.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the OEM equivalent of the Sierra 18-2909-9 gasket?\u003c\/strong\u003e It cross-references to Barr MC47-27-99757, Crusader 97498, GLM 32170, Mallory 9-61421, Mercruiser Stern Drive 27-99757, OMC Stern Drive 3853412, 901157 and 915025, Osco CS-GH, Volvo Penta 3853412 and 856116, and Yamaha Stern Drive YSC-12190-00-AC.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2909-9 gasket?\u003c\/strong\u003e The Sierra 18-2909-9 Exhaust Manifold Gasket is grey.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2909-9 gasket weigh?\u003c\/strong\u003e The Sierra 18-2909-9 Exhaust Manifold Gasket weighs 0.22 pounds per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2909-9 gasket included with a manifold mounting kit?\u003c\/strong\u003e Yes, this gasket is included as part of Sierra mounting kit 18-8533, which is used to mount manifold 18-1952-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is the 18-2909-9 gasket designed for?\u003c\/strong\u003e It is designed for GM V6 229 and 262 cubic inch engines, specifically Models 185 and 205, Port and Starboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2909-9 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-2909-9 is a genuine Sierra International part, and Sierra states each of its products meets or exceeds the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-2909-9 gasket to replace a Mercruiser 27-99757 gasket?\u003c\/strong\u003e Yes, the Sierra 18-2909-9 cross-references directly to Mercruiser Stern Drive part 27-99757.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the box with this gasket?\u003c\/strong\u003e The package includes 2 Sierra 18-2909-9 exhaust manifold gaskets.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132966619,"sku":"SIE-18-2909-9","price":18.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2909-9__46471.1737867595.500.750.jpg?v=1785188545"},{"product_id":"sierra-18-2912-1-exhaust-manifold-gasket-replaces-oem-27-53354-mercruiser-exhaust-manifold-application","title":"Sierra Exhaust Manifold Gasket 18-2912-1, Replaces 27-53354","description":"\u003cp\u003eThe Sierra 18-2912-1 is an exhaust manifold gasket engineered to seal the mating surface between the exhaust manifold and the engine block on marine engines. It is designed as a direct-fit replacement for OEM gasket 27-53354, restoring a tight seal that prevents exhaust leaks, loss of cooling water pressure, and the corrosion that follows a failed gasket. Installing a fresh manifold gasket during routine maintenance or whenever the manifold is removed for inspection, cleaning, or replacement helps protect surrounding components from exhaust gas and water intrusion.\u003c\/p\u003e\u003cp\u003eThis gasket is supplied in a white finish and is sold individually. Sierra manufactures its exhaust manifold gaskets to marine-grade tolerances so the part seats correctly against the manifold flange without leaks under the heat cycling and vibration typical of inboard and sterndrive engine operation. Because exhaust manifold gaskets are wear items that lose their seal over time, replacing the gasket any time the manifold is disturbed is standard practice to avoid a repeat leak shortly after reassembly.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2912-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.29 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282365844\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Sold individually\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications that use OEM exhaust manifold gasket 27-53354. Confirm your engine's original gasket part number against 27-53354 before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-53354\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2912-1 gasket replace?\u003c\/strong\u003e The Sierra 18-2912-1 exhaust manifold gasket is a direct replacement for OEM gasket 27-53354.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2912-1 gasket sold as a single gasket or a set?\u003c\/strong\u003e The 18-2912-1 is sold individually as one exhaust manifold gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2912-1 exhaust manifold gasket weigh?\u003c\/strong\u003e It weighs 0.29 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2912-1 gasket?\u003c\/strong\u003e This gasket has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2912-1 gasket?\u003c\/strong\u003e The UPC is 808282365844.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace this exhaust manifold gasket?\u003c\/strong\u003e Replace the 18-2912-1 gasket any time the exhaust manifold is removed, or if you notice exhaust leaks, unusual exhaust noise, or corrosion around the manifold-to-block joint, since a used gasket rarely reseals reliably once disturbed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2912-1 gasket fit my engine?\u003c\/strong\u003e The 18-2912-1 fits applications that originally used OEM gasket 27-53354; check your engine's existing gasket part number against 27-53354 to confirm fit before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2912-1 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-2912-1 is a Sierra-manufactured replacement gasket, cross-referenced to OEM part 27-53354, rather than a part sourced from the original engine manufacturer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2912-1 exhaust manifold gasket made from?\u003c\/strong\u003e The dossier for the 18-2912-1 does not specify the gasket material.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2912-1 gasket come with installation hardware?\u003c\/strong\u003e No, the 18-2912-1 is the gasket only; no bolts, studs, or additional hardware are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does an exhaust manifold need a gasket at all?\u003c\/strong\u003e The gasket seals the joint between the exhaust manifold and the engine block, preventing exhaust gas and cooling water leaks that can otherwise damage surrounding engine components.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132999387,"sku":"SIE-18-2912-1","price":94.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2912_lg__28911.1558124672.500.750.jpg?v=1785188719"},{"product_id":"exhaust-manifold-gasket-for-mercruiser-mcm-mie-gm-v-8-283-305-350-377-cid-replaces-barr-chv-47-000-27-33395-pack-of-2-sierra-18-2949-9","title":"Sierra 18-2949-9 Exhaust Manifold Gasket, Pack of 2, Replaces 96306, Fits MCM\/MIE GM V-8 283\/305\/350\/377 cid Engines","description":"\u003cp\u003eThe Sierra 18-2949-9 Exhaust Manifold Gasket is a direct-fit replacement gasket sold as a pack of 2, designed for MCM\/MIE GM V-8 engines in 283, 305, 350, and 377 cubic-inch displacement. It is built for use with the 18-1951-1 exhaust manifold, sealing the manifold-to-block joint to prevent exhaust and coolant leaks that can lead to overheating, corrosion, or engine damage if left unaddressed. Each gasket is manufactured to match OEM dimensions and sealing performance, giving a reliable fit without modification during manifold service or replacement.\u003c\/p\u003e\u003cp\u003eBecause exhaust manifold gaskets are wear items exposed to constant heat cycling and saltwater or freshwater cooling passages, replacing them with a properly sized gasket like the 18-2949-9 helps maintain a tight seal and supports long-term reliability of the exhaust system. The pack-of-2 quantity is convenient for servicing both sides of a V-8 manifold setup in a single order.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2949-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.42 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e MCM\/MIE GM V-8 283, 305, 350 and 377 cid engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManifold Fitment:\u003c\/strong\u003e 18-1951-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 96306\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMCM\/MIE GM V-8 (283, 305, 350 and 377 cid) engines\u003c\/li\u003e\n\u003cli\u003eUse with exhaust manifold 18-1951-1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e96306\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2949-9 exhaust manifold gasket fit?\u003c\/strong\u003e The 18-2949-9 fits MCM\/MIE GM V-8 engines in 283, 305, 350, and 377 cubic-inch displacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in this package?\u003c\/strong\u003e The 18-2949-9 is sold as a pack of 2 exhaust manifold gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich exhaust manifold does this gasket work with?\u003c\/strong\u003e This gasket is designed for use with the 18-1951-1 exhaust manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2949-9 replace?\u003c\/strong\u003e It replaces OEM part number 96306.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2949-9 gasket set weigh?\u003c\/strong\u003e The package weighs 0.42 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2949-9 a direct OEM replacement?\u003c\/strong\u003e Yes, the Sierra 18-2949-9 is manufactured to match the original 96306 gasket for a direct-fit replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need one pack or two for a V-8 manifold job?\u003c\/strong\u003e One 18-2949-9 pack contains 2 gaskets, which covers a typical two-gasket manifold installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if I do not replace a worn exhaust manifold gasket?\u003c\/strong\u003e A worn gasket at the manifold-to-block joint on a 283, 305, 350, or 377 cid GM V-8 can leak exhaust or coolant, so installing the 18-2949-9 during manifold service helps maintain a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this gasket be reused after removal?\u003c\/strong\u003e No, exhaust manifold gaskets like the 18-2949-9 are designed for one-time use and should be replaced with a new set anytime the manifold is removed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2949-9 suitable for both MCM and MIE engine configurations?\u003c\/strong\u003e Yes, it is designed to fit both MCM and MIE GM V-8 283, 305, 350, and 377 cid engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135391451,"sku":"SIE-18-2949-9","price":26.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2949-9__90740.1737827611.500.750.jpg?v=1785188004"},{"product_id":"sierra-18-2971-1-exhaust-elbow-gasket-for-volvo-penta-replaces-856039-3","title":"Sierra Exhaust Manifold Gasket 18-2971-1 for Volvo Penta Exhaust Manifolds","description":"\u003cp\u003eThe Sierra 18-2971-1 Exhaust Manifold Gasket is a round, white gasket designed to seal the exhaust manifold connection on applicable Volvo Penta marine engines. It creates a reliable seal at the manifold joint, helping to prevent exhaust leaks and maintain proper engine performance. As a single-count component, this gasket is intended for straightforward replacement during routine maintenance or when servicing the exhaust manifold assembly. Its round shape and white finish are consistent with OEM-style manifold gaskets used in Volvo Penta exhaust manifold systems. At just 0.02 pounds, it is a lightweight, low-cost part that is easy to keep on hand as a spare for scheduled upkeep or unexpected repairs. Sierra manufactures this gasket to fit the exhaust manifold application it is designated for, making it a straightforward choice for boat owners and marine technicians replacing a worn or damaged manifold gasket. Always confirm the part number matches your existing gasket before ordering to ensure correct fitment.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2971-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Volvo Penta Exhaust Manifolds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282360238\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesignated for use in Volvo Penta exhaust manifold applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eNo OEM cross-reference numbers are specified for this part.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2971-1?\u003c\/strong\u003e The Sierra 18-2971-1 is a round, white exhaust manifold gasket used to seal the exhaust manifold connection on applicable Volvo Penta marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape and color is this gasket?\u003c\/strong\u003e This gasket is round in shape and white in color, part number 18-2971-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2971-1 gasket weigh?\u003c\/strong\u003e It weighs 0.02 pounds, making it a lightweight component that is inexpensive to keep as a spare.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e Each package of the Sierra 18-2971-1 contains a single gasket, listed as a unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of engine does this gasket belong to?\u003c\/strong\u003e The 18-2971-1 gasket is categorized under Volvo Penta exhaust manifolds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2971-1 an OEM part or aftermarket?\u003c\/strong\u003e Sierra manufactures the 18-2971-1 as a replacement gasket for Volvo Penta exhaust manifold applications; no separate OEM cross-reference numbers are listed for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this part?\u003c\/strong\u003e The UPC for the Sierra 18-2971-1 exhaust manifold gasket is 808282360238.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this gasket?\u003c\/strong\u003e The 18-2971-1 gasket should be replaced when servicing the exhaust manifold or if signs of an exhaust leak appear at the manifold joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2971-1 gasket include any other hardware?\u003c\/strong\u003e The package includes only the exhaust manifold gasket itself, with no additional hardware included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-2971-1 gasket straightforward?\u003c\/strong\u003e Yes, replacing the exhaust manifold gasket is a standard maintenance task involving removal of the manifold and installation of the new gasket, part number 18-2971-1.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135850203,"sku":"SIE-18-2971-1","price":14.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2971-1__54250.1737862799.500.750.jpg?v=1785188289"},{"product_id":"sierra-18-4008-exhaust-manifold-block-off-plate-replaces-60207-for-gm-small-block-v8-305-350-mercruiser-manifolds","title":"Sierra 18-4008 Block Off Plate, OEM 60207, for 18-1958-1 and 18-1962-1 Exhaust Manifolds","description":"\u003cp\u003eThe Sierra 18-4008 Block Off Plate is a replacement block off plate used to cap an exhaust manifold port when an elbow is not installed at that location. It is built for use with Sierra manifolds 18-1958-1 and 18-1962-1, sealing the manifold opening to maintain proper exhaust flow and prevent leaks. This plate is a direct cross-reference for OEM part number 60207, giving boat owners and marine technicians a straightforward way to source a replacement without going through the original equipment manufacturer.\u003c\/p\u003e\u003cp\u003eInstallation requires two 18-2833 elbow gaskets, which are not included with this plate and must be ordered separately. Proper gasket placement at the manifold-to-plate interface is essential to achieve a leak-free seal against exhaust gases and cooling water pressure. At 0.08 pounds, the block off plate is a small, lightweight component intended for straightforward bolt-on replacement during manifold servicing or reconfiguration.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4008\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Block Off Plate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 60207\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Gaskets:\u003c\/strong\u003e (2) 18-2833 elbow gaskets (sold separately)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563194\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eUse with Manifolds: 18-1958-1, 18-1962-1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e60207\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4008 used for?\u003c\/strong\u003e It is a block off plate that caps an unused port on an exhaust manifold, used with manifolds 18-1958-1 and 18-1962-1 in place of an elbow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-4008 cross-reference to an OEM part number?\u003c\/strong\u003e Yes, the Sierra 18-4008 block off plate is a direct replacement for OEM number 60207.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich manifolds does the 18-4008 block off plate fit?\u003c\/strong\u003e It is designed for use with Sierra manifolds 18-1958-1 and 18-1962-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre gaskets included with the 18-4008 block off plate?\u003c\/strong\u003e No, gaskets are not included. Installing the 18-4008 requires two 18-2833 elbow gaskets, purchased separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets are needed to install the 18-4008?\u003c\/strong\u003e Two 18-2833 elbow gaskets are required to properly seal the 18-4008 block off plate against the manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4008 block off plate weigh?\u003c\/strong\u003e The Sierra 18-4008 weighs 0.08 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4008 an original Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-4008 is a Sierra manufactured part sold as a cross-reference replacement for OEM number 60207.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-4008 be used on any exhaust manifold?\u003c\/strong\u003e No, it is intended specifically for use with 18-1958-1 and 18-1962-1 manifolds rather than as a universal fit part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if I install the 18-4008 without the correct gaskets?\u003c\/strong\u003e Without the two required 18-2833 elbow gaskets, the block off plate will not seal properly against the manifold, risking exhaust and coolant leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4008 block off plate a bolt-on part?\u003c\/strong\u003e Yes, it is designed to bolt directly onto the 18-1958-1 or 18-1962-1 manifold in place of an elbow assembly.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170485979,"sku":"SIE-18-4008","price":14.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4008_lg__16304.1558126561.500.750.jpg?v=1785329145"},{"product_id":"sierra-18-4009-exhaust-manifold-end-plate-replaces-mercruiser-60252a2-60252-fits-sierra-18-1960-1-manifold-i-o-mercruiser-cooling-system","title":"Sierra 18-4009 Manifold Front Plate, Replaces Mercury Marine 60252A2, Fits Port and Starboard Exhaust Manifolds","description":"\u003cp\u003eThe Sierra 18-4009 is a front (end) plate for marine exhaust manifolds, designed to mount to the front of the manifold casting and seal the internal water and exhaust passages. It is built to meet or exceed original equipment quality and is cross-referenced to Mercury Marine part number 60252A2, making it a direct equivalent for engines and manifold assemblies that call for that OEM plate.\u003c\/p\u003e\u003cp\u003eThis front plate is used with Sierra exhaust manifolds 18-1958-1 and 18-1962-1, and fits both the port and starboard versions of those manifolds, so a single part number covers either side of the engine. It pairs with the Sierra 18-8512 mounting kit, which supplies the matching 18-2832-1 front\/end plate gasket needed for a complete, sealed installation. The plate has a machined finish for a consistent, flat sealing surface against the manifold casting.\u003c\/p\u003e\u003cp\u003eBecause the manifold's internal water jacket runs past the front plate, a worn, cracked, warped, or corroded original plate is a common source of coolant leaks and can allow raw water to escape or air to enter the cooling passages. Replacing the 18-4009 along with its mating gasket restores a tight seal at this joint and is a routine step when servicing or rebuilding the 18-1958-1 or 18-1962-1 manifold.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4009\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Front\/End Plate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 60252A2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifolds:\u003c\/strong\u003e 18-1958-1, 18-1962-1 (Port \u0026amp; Starboard)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Mounting Kit:\u003c\/strong\u003e 18-8512 (includes 18-2832-1 gasket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.41 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563200\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSierra Exhaust Manifolds 18-1958-1 and 18-1962-1, Port and Starboard\u003c\/li\u003e\n\u003cli\u003eUsed with Sierra Mounting Kit 18-8512\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 60252A2\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-4009 fit?\u003c\/strong\u003e The Sierra 18-4009 front plate is used with exhaust manifolds 18-1958-1 and 18-1962-1, and it fits both the port and starboard versions of those manifolds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4009 the same as Mercury Marine 60252A2?\u003c\/strong\u003e Yes, the Sierra 18-4009 is cross-referenced to Mercury Marine part number 60252A2 and is built to meet or exceed original equipment quality.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this plate fit both port and starboard manifolds?\u003c\/strong\u003e Yes. The 18-4009 is designed for use with both the port and starboard 18-1958-1 and 18-1962-1 manifolds, so one part number works on either side.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gasket do I need with the 18-4009 front plate?\u003c\/strong\u003e The front plate pairs with the 18-2832-1 front\/end plate gasket, which is included in the Sierra 18-8512 mounting kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4009 weigh?\u003c\/strong\u003e The Sierra 18-4009 front plate weighs 1.41 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the mounting kit used with this part?\u003c\/strong\u003e The 18-4009 uses the Sierra 18-8512 mounting kit, which includes the matching 18-2832-1 gasket for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-4009 have?\u003c\/strong\u003e The plate has a machined finish for a flat, consistent sealing surface against the exhaust manifold casting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the exhaust manifold front plate?\u003c\/strong\u003e A worn, cracked, or corroded front plate can leak at the manifold's water jacket; replacing the 18-4009 along with its gasket restores a proper seal during manifold service or rebuilds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4009 an OEM or aftermarket part?\u003c\/strong\u003e The 18-4009 is a Sierra aftermarket replacement front plate, manufactured to meet or exceed the quality of the original Mercury Marine 60252A2 it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-4009 front plate?\u003c\/strong\u003e The Sierra 18-4009 measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-4009 come with mounting bolts?\u003c\/strong\u003e No, mounting bolts are supplied separately as part of the Sierra 18-8512 mounting kit, not with the 18-4009 plate alone.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170846427,"sku":"SIE-18-4009","price":62.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4009_lg__89745.1558126633.500.750.jpg?v=1785188249"},{"product_id":"sierra-18-4224-drain-elbow-assembly-3-4-inch-npt-exhaust-manifold-drain-replaces-mercruiser-22-806926a1-22-862210a01-fits-mercruiser-v-6-v-8-i-o-cooling-systems","title":"Sierra 18-4224 Drain Elbow Assembly, Replaces Mercruiser 22-806926A1, 3\/4 Inch NPT","description":"\u003cp\u003eThe Sierra 18-4224 Drain Elbow Assembly is a stainless steel replacement fitting used in the cooling system of MerCruiser I\/O sterndrive engines. It threads into the exhaust manifold or manifold gasket location using a 3\/4 inch NPT thread and provides the drain connection point for the raw water cooling circuit, allowing water to be routed away from the manifold during operation or drained from the block during winterization and service.\u003c\/p\u003e\u003cp\u003eBuilt from stainless steel with a machined finish, the elbow is designed to resist the corrosion and heat exposure typical of the exhaust manifold area on gasoline sterndrive engines. It is finished in gray and supplied as a single-piece assembly, making it a straightforward drop-in replacement when an original elbow has corroded, cracked, or seized.\u003c\/p\u003e\u003cp\u003eThis elbow is applicable to MerCruiser I\/O cooling systems and is built to meet or exceed the performance of the original equipment part it replaces, giving boat owners and marine technicians a reliable way to restore the manifold drain connection without sourcing a used or hard-to-find factory part.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4224\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Drain Elbow Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 3\/4 inch NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\/Finish:\u003c\/strong\u003e Gray, machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 7.25 x 5.63 x 2.13 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Pieces:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e I\/O - MerCruiser cooling system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282125141\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 22-806926A1, 22-862210A01\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for MerCruiser I\/O sterndrive engines in the cooling system application, including MCM\/MIE V-6 and V-8 engines with center rise exhaust manifolds.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e22-806926A1\u003c\/li\u003e\n\u003cli\u003e22-862210A01\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-4224 Drain Elbow Assembly replace?\u003c\/strong\u003e It is a direct replacement for MerCruiser exhaust manifold drain elbows 22-806926A1 and 22-862210A01, so any boat currently fitted with one of those OEM elbows can use the Sierra 18-4224 instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size does this drain elbow use?\u003c\/strong\u003e The Sierra 18-4224 uses a 3\/4 inch NPT thread, matching the original MerCruiser manifold drain connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is the 18-4224 drain elbow designed for?\u003c\/strong\u003e This drain elbow fits MerCruiser I\/O sterndrive engines in the cooling system, including MCM\/MIE V-6 and V-8 engines with center rise exhaust manifolds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-4224 made from?\u003c\/strong\u003e It is machined from stainless steel with a gray finish, giving it resistance to the heat and corrosion found at the exhaust manifold drain location.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4224 drain elbow weigh?\u003c\/strong\u003e The Sierra 18-4224 Drain Elbow Assembly weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this drain elbow?\u003c\/strong\u003e The Sierra 18-4224 measures 7.25 x 5.63 x 2.13 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4224 a genuine Sierra part or aftermarket?\u003c\/strong\u003e It is a Sierra-branded replacement part manufactured to meet or exceed the performance of the original MerCruiser equipment it replaces, rather than a factory MerCruiser part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many pieces come in the 18-4224 assembly?\u003c\/strong\u003e The Sierra 18-4224 ships as a single-piece drain elbow assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere does the 18-4224 drain elbow install on the engine?\u003c\/strong\u003e It threads into the exhaust manifold drain location using its 3\/4 inch NPT fitting, forming part of the raw water cooling circuit on MerCruiser I\/O engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace a drain elbow like the 18-4224?\u003c\/strong\u003e Drain elbows in the manifold cooling circuit are prone to corrosion over time; the Sierra 18-4224 provides a stainless steel replacement when the original elbow has corroded, cracked, or seized.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988171796699,"sku":"SIE-18-4224","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4224_lg__09267.1558126798.500.750.jpg?v=1785188042"},{"product_id":"sierra-18-4347-1-exhaust-manifold-gasket-set-for-gm-175-185-205-229-262-cid-marine-engines-replaces-oem-27-99757-27-41813-1","title":"Sierra 18-4347-1 Exhaust Manifold Gasket Set for GM 175\/185\/205 HP 229 and 262 CID Engines","description":"\u003cp\u003eThe Sierra 18-4347-1 Exhaust Manifold Gasket Set is a complete gasket kit for GM 229 and 262 cid marine engines rated 175, 185, and 205 horsepower. It supplies every gasket needed to reseal the exhaust manifold to the cylinder head and the exhaust elbow to the manifold, so the whole exhaust-side seal can be renewed in one job rather than sourcing individual gaskets separately.\u003c\/p\u003e\u003cp\u003eThe set contains two Exhaust Elbow Mounting Gaskets (Sierra part 18-0897, O.E. 27-41813-1) and two Exhaust Manifold to Cylinder Head Gaskets (Sierra part 18-2909, O.E. 27-99757), giving full coverage for both mounting joints in the exhaust path. The gasket material is white. Sierra engineers this set to meet or exceed the specifications of the original equipment gaskets it replaces, and Sierra supplies OEM engine manufacturers and boat builders with parts of the same quality every day.\u003c\/p\u003e\u003cp\u003eThis gasket set is intended for GM 175, 185, and 205 horsepower marine engines built on the 229 and 262 cubic inch displacement blocks.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4347-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e GM 175, 185, 205 HP (229 and 262 CID)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282236731\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.21 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e 2x Exhaust Elbow Mounting Gasket (part 18-0897), 2x Exhaust Manifold to Cylinder Head Gasket (part 18-2909)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-41813-1, 27-99757\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM 175, 185, 205 HP engines (229 and 262 CID)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-41813-1\u003c\/li\u003e\n\u003cli\u003e27-99757\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-4347-1 exhaust manifold gasket set?\u003c\/strong\u003e The set includes two Exhaust Elbow Mounting Gaskets (part 18-0897) and two Exhaust Manifold to Cylinder Head Gaskets (part 18-2909), covering both mounting joints in the exhaust path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does this gasket set fit?\u003c\/strong\u003e Part 18-4347-1 fits GM marine engines rated 175, 185, and 205 horsepower on the 229 and 262 cubic inch displacement blocks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-4347-1 fit other GM cid engines besides 229 and 262?\u003c\/strong\u003e No, this gasket set is specified for GM 229 and 262 cid engines rated 175, 185, and 205 HP only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does 18-4347-1 cross-reference?\u003c\/strong\u003e The gaskets in this set cross-reference OEM numbers 27-41813-1 (exhaust elbow mounting gasket) and 27-99757 (exhaust manifold to cylinder head gasket).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the box?\u003c\/strong\u003e Two of each type are included: two exhaust elbow mounting gaskets and two exhaust manifold to cylinder head gaskets, for a total of four gaskets in the 18-4347-1 set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the two gaskets in this set?\u003c\/strong\u003e Part 18-0897 seals the exhaust elbow to the manifold, while part 18-2909 seals the exhaust manifold to the cylinder head; both are included together in the 18-4347-1 set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4347-1 gasket set weigh?\u003c\/strong\u003e The Sierra 18-4347-1 exhaust manifold gasket set weighs 0.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the gasket material?\u003c\/strong\u003e The gaskets in the Sierra 18-4347-1 set are white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4347-1 gasket set genuine Sierra or an aftermarket copy?\u003c\/strong\u003e It is a genuine Sierra-manufactured part, engineered to meet or exceed the specifications of the original equipment gaskets it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit cover both the exhaust elbow and the manifold-to-head joint?\u003c\/strong\u003e Yes, the 18-4347-1 set includes gaskets for both the exhaust elbow mounting joint and the exhaust manifold to cylinder head joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this gasket set?\u003c\/strong\u003e The Sierra 18-4347-1 exhaust manifold gasket set has UPC 808282236731.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988193620187,"sku":"SIE-18-4347-1","price":24.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4347-1_lg__67154.1558128104.500.750.jpg?v=1785188421"},{"product_id":"sierra-18-4348-exhaust-manifold-gasket-set-for-gm-454-7-4l-525-8-2l-replaces-mercury-27-46820-27-41813-1","title":"Sierra 18-4348 Exhaust Manifold Gasket Set, Replaces 27-46820, for GM 454, 525 (7.4L \u0026 8.2L)","description":"\u003cp\u003eThe Sierra 18-4348 Exhaust Manifold Gasket Set is a complete gasket kit for GM 454, 525 (7.4L \u0026amp; 8.2L) marine engines, supplying every gasket needed to reseal the exhaust manifold assembly in one purchase. The set contains two 18-0418 Manifold to Cylinder Head Gaskets and two 18-0897 Exhaust Elbow Mounting Gaskets, covering both the manifold-to-head joint and the exhaust elbow mounting joint on the engine. Each gasket is finished in white and is built to Sierra's standard for marine exhaust sealing applications, where consistent, leak-free contact between mating surfaces is critical to prevent exhaust and water intrusion. Because the kit bundles both gasket types required for a manifold gasket job, installers do not need to source the manifold-to-head gasket and the elbow gasket separately. The 18-4348 set is intended as a like-for-like replacement for the OEM gaskets on GM 454, 525 (7.4L \u0026amp; 8.2L) engines and is backed by Sierra's standard customer satisfaction warranty. This kit is a straightforward fit for anyone servicing the exhaust manifold and exhaust elbow on a compatible GM 454\/525 marine engine.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4348\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Exhaust Manifold Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e GM 454, 525 (7.4L \u0026amp; 8.2L)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContains:\u003c\/strong\u003e (2) 18-0418 Manifold to Cylinder Head Gasket; (2) 18-0897 Exhaust Elbow Mounting Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.25 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999755964\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM 454, 525 (7.4L \u0026amp; 8.2L)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-46820 (Manifold to Cylinder Head Gasket)\u003c\/li\u003e\n\u003cli\u003e27-41813-1 (Exhaust Elbow Mounting Gasket)\u003c\/li\u003e\n\u003cli\u003eGLM 39890\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-4348 gasket set fit?\u003c\/strong\u003e The Sierra 18-4348 Exhaust Manifold Gasket Set fits GM 454, 525 (7.4L \u0026amp; 8.2L) marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-4348 gasket set?\u003c\/strong\u003e The kit contains two 18-0418 Manifold to Cylinder Head Gaskets and two 18-0897 Exhaust Elbow Mounting Gaskets, four gaskets total.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-4348 set replace?\u003c\/strong\u003e The gaskets in the Sierra 18-4348 set correspond to OEM numbers 27-46820 (manifold to cylinder head gasket) and 27-41813-1 (exhaust elbow mounting gasket), and the set is also interchangeable with GLM 39890.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4348 gasket set weigh?\u003c\/strong\u003e The Sierra 18-4348 Exhaust Manifold Gasket Set weighs 0.25 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color are the gaskets in this set?\u003c\/strong\u003e The gaskets in the Sierra 18-4348 set are white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4348 set a genuine Sierra part?\u003c\/strong\u003e Yes, part number 18-4348 is a Sierra-branded Exhaust Manifold Gasket Set, and Sierra parts are covered under Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to buy the manifold gasket and elbow gasket separately?\u003c\/strong\u003e No, the Sierra 18-4348 set already includes both gasket types needed for the job: two manifold-to-cylinder-head gaskets and two exhaust elbow mounting gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-4348 gasket set work on a 502 or 8.2L GM engine?\u003c\/strong\u003e The Sierra 18-4348 Exhaust Manifold Gasket Set is designated for GM 454, 525 (7.4L \u0026amp; 8.2L) engines, so it covers the 8.2L displacement listed in that fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-4348 set include a warranty?\u003c\/strong\u003e Yes, the Sierra 18-4348 Exhaust Manifold Gasket Set is covered under Sierra's industry customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the Sierra 18-4348 kit?\u003c\/strong\u003e The Sierra 18-4348 kit contains four gaskets total: two 18-0418 Manifold to Cylinder Head Gaskets and two 18-0897 Exhaust Elbow Mounting Gaskets.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988193652955,"sku":"SIE-18-4348","price":41.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4348_lg__75008.1558128199.500.750.jpg?v=1785188422"},{"product_id":"exhaust-manifold-gasket-set-for-mercruiser-stern-drive-sierra-18-4349-interchanges-glm-39880-mallory-9-61455","title":"Sierra 18-4349 Exhaust Manifold Gasket Set, Interchangeable with GLM 39880 and Mallory 9-61455","description":"\u003cp\u003eThe Sierra 18-4349 Exhaust Manifold Gasket Set is a complete gasket kit for marine stern drive exhaust manifolds, engineered to seal the manifold-to-block and elbow-to-manifold joints against the extreme heat and vibration of continuous marine operation. Each kit contains four gaskets: two 18-0872 exhaust manifold gaskets and two 18-0897 exhaust elbow gaskets, giving you everything needed to reseal both manifold joints in one package rather than sourcing gaskets separately. Sierra engineers this set to meet or exceed the performance of the original equipment part it replaces, so it installs and seals the same way the factory gasket did.\u003c\/p\u003e\u003cp\u003eThis gasket set is designed as a direct interchange for GLM 39880 and Mallory 9-61455, so if your parts manual or old gasket carries either of those numbers, the Sierra 18-4349 is the correct replacement. Use it any time you are servicing exhaust manifolds or elbows during a rebuild, replacing a leaking gasket, or performing routine maintenance on a stern drive exhaust system.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4349\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContains:\u003c\/strong\u003e (2) 18-0872 Exhaust Manifold Gasket, (2) 18-0897 Exhaust Elbow Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.38 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchangeable With:\u003c\/strong\u003e GLM 39880, Mallory 9-61455\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eSerial number range 6218462-B525981\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 39880\u003c\/li\u003e\n\u003cli\u003eMallory 9-61455\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-4349 gasket set include?\u003c\/strong\u003e The Sierra 18-4349 kit includes four gaskets total: two 18-0872 exhaust manifold gaskets and two 18-0897 exhaust elbow gaskets, covering both manifold sealing points in a single package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4349 the same as GLM 39880?\u003c\/strong\u003e Yes, the Sierra 18-4349 is interchangeable with GLM 39880, so it can be used as a direct replacement wherever that number is specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4349 cross-reference to a Mallory part number?\u003c\/strong\u003e It does. The Sierra 18-4349 Exhaust Manifold Gasket Set is interchangeable with Mallory 9-61455.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4349 gasket set weigh?\u003c\/strong\u003e The Sierra 18-4349 Exhaust Manifold Gasket Set weighs 0.38 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat serial number range applies to the 18-4349 gasket set?\u003c\/strong\u003e The Sierra 18-4349 is specified for serial number range 6218462-B525981.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre the manifold and elbow gaskets sold separately, or only as a set?\u003c\/strong\u003e The 18-4349 is sold as a complete set containing both the 18-0872 exhaust manifold gaskets and 18-0897 exhaust elbow gaskets, so both joint types are covered in one purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4349 an OEM or aftermarket part?\u003c\/strong\u003e The Sierra 18-4349 is an aftermarket gasket set engineered to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-4349 be used for a full exhaust manifold rebuild?\u003c\/strong\u003e Yes, since it includes both manifold gaskets and elbow gaskets, the 18-4349 set provides the gaskets needed to reseal the manifold assembly during a rebuild or gasket replacement job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one Sierra 18-4349 kit?\u003c\/strong\u003e One Sierra 18-4349 kit contains four gaskets: two 18-0872 exhaust manifold gaskets and two 18-0897 exhaust elbow gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-0872 and 18-0897 gaskets included in this set?\u003c\/strong\u003e Within the Sierra 18-4349 set, the 18-0872 gaskets seal the exhaust manifold joint while the 18-0897 gaskets seal the exhaust elbow joint, and both are included as a pair each.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988194144475,"sku":"SIE-18-4349","price":30.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4349_lg__11576.1558128258.500.750.jpg?v=1785189181"},{"product_id":"exhaust-manifold-gasket-set-for-mercruiser-gm-153-181-2-5l-3-0l-replaces-27-99777a1-sierra-18-4367","title":"Sierra 18-4367 Exhaust Manifold Gasket Set, Replaces 27-99777A1, for GM 153 \u0026 181 CID I\/O Engines","description":"\u003cp\u003eThe Sierra 18-4367 Exhaust Manifold Gasket Set is a replacement gasket kit for Mercruiser I\/O engines equipped with siamese port cylinder heads. It is engineered to seal the exhaust manifold to the cylinder head, preventing exhaust and water leaks at the joint that can lead to overheating, corrosion, or engine damage if left unaddressed. This gasket set is built to meet or exceed the specifications of the original equipment part it replaces, standing up to the heat cycling, saltwater exposure, and vibration typical of the marine exhaust environment.\u003c\/p\u003e\u003cp\u003eThis set is designed specifically for GM 153 and 181 cubic inch displacement (2.5L and 3.0L) engines rated at 120 and 140 horsepower, with serial numbers 6229718 and up, on applications using siamese port cylinder heads. Installing the correct gasket set for this cylinder head configuration and serial number range is important, since earlier serial numbers or non-siamese port heads use a different gasket design. The Sierra 18-4367 directly replaces OEM part number 27-99777A1, so it installs as a drop-in replacement during exhaust manifold service or when addressing a leaking manifold gasket.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4367\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.27 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563309\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e I\/O (Mercruiser)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Head Type:\u003c\/strong\u003e Siamese Port\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e GM 153 \u0026amp; 181 (2.5L \u0026amp; 3.0L) CID engines, 120 \u0026amp; 140 HP, S\/N 6229718 \u0026amp; Up\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM 153 \u0026amp; 181 (2.5L \u0026amp; 3.0L) CID engines\u003c\/li\u003e\n\u003cli\u003e120 \u0026amp; 140 HP\u003c\/li\u003e\n\u003cli\u003eS\/N 6229718 \u0026amp; Up\u003c\/li\u003e\n\u003cli\u003eWith siamese port cylinder heads\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-99777A1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-4367 exhaust manifold gasket set fit?\u003c\/strong\u003e This gasket set fits GM 153 and 181 cubic inch displacement (2.5L and 3.0L) engines rated at 120 and 140 horsepower, specifically units with serial number 6229718 and up that use siamese port cylinder heads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-4367 replace?\u003c\/strong\u003e It replaces OEM part number 27-99777A1, so it can be installed as a direct substitute during exhaust manifold gasket service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket set work with any cylinder head design?\u003c\/strong\u003e No, the 18-4367 is designed specifically for engines with siamese port cylinder heads; it is not intended for other cylinder head configurations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a serial number range relevant when ordering this gasket set?\u003c\/strong\u003e Yes, the Sierra 18-4367 is intended for engines with serial number 6229718 and up; engines outside that range may require a different gasket set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4367 gasket set weigh?\u003c\/strong\u003e The Sierra 18-4367 Exhaust Manifold Gasket Set weighs 0.27 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-4367 gasket set?\u003c\/strong\u003e The gasket set is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4367 an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is an aftermarket replacement manufactured by Sierra, engineered to meet or exceed the specifications of the original OEM part 27-99777A1 it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat horsepower ratings apply to engines using this gasket set?\u003c\/strong\u003e The 18-4367 is designed for engines rated at 120 and 140 horsepower within the GM 153 and 181 CID engine family.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4367 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-4367 Exhaust Manifold Gasket Set is covered under Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-4367 kit?\u003c\/strong\u003e The kit includes the Sierra 18-4367 Exhaust Manifold Gasket Set components needed to seal the exhaust manifold to the cylinder head on applicable GM 153 \u0026amp; 181 CID engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988194275547,"sku":"SIE-18-4367","price":29.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4367_lg__78529.1558129433.500.750.jpg?v=1785188885"},{"product_id":"sierra-18-4396-exhaust-manifold-gasket-set-for-mercruiser-250-4-1l-cid-165-hp-replaces-27-46401a1","title":"Sierra 18-4396 Exhaust Manifold Gasket Set, Replaces 27-46401A1, for 250 (4.1L) CID Engine 165 HP S\/N 2770032 \u0026 Up","description":"\u003cp\u003eThe Sierra 18-4396 Exhaust Manifold Gasket Set is built to meet or exceed original equipment quality for engines that call for OEM 27-46401A1. This set is engineered for 250 (4.1L) CID engines rated at 165 HP with serial numbers 2770032 and up, giving boat owners a direct replacement when resealing the exhaust manifold during maintenance or after a failed gasket causes leaks, overheating, or exhaust smell in the engine compartment.\u003c\/p\u003e\u003cp\u003eThe kit includes the components needed to reseal the exhaust manifold joint, including an intake exhaust gasket (O.E. 27-46401) and a thermostat gasket, so the job can be completed without sourcing separate individual gaskets. Each gasket is manufactured to original equipment specifications for a proper seal and reliable fit against the mating surfaces.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4396\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Exhaust Manifold Gasket Set (Intake Exhaust Gasket, Thermostat Gasket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.48 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563590\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e250 (4.1L) CID Engine, 165 HP, S\/N 2770032 \u0026amp; Up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-46401A1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-4396 Exhaust Manifold Gasket Set fit?\u003c\/strong\u003e It is designed for 250 (4.1L) CID engines rated at 165 HP with serial numbers 2770032 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does Sierra 18-4396 replace?\u003c\/strong\u003e It replaces OEM part number 27-46401A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-4396 gasket set?\u003c\/strong\u003e The set contains an intake exhaust gasket (O.E. 27-46401) and a thermostat gasket, giving you the gaskets needed to reseal the exhaust manifold joint in one package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many of these gasket sets come in a package?\u003c\/strong\u003e The Sierra 18-4396 ships as a single set containing one of each included gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-4396 gasket set weigh?\u003c\/strong\u003e It weighs 0.48 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-4396 an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is an aftermarket Sierra part manufactured to meet or exceed the quality of the original equipment part it replaces, OEM 27-46401A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the exhaust manifold gasket set?\u003c\/strong\u003e Replace the gasket set anytime the exhaust manifold is removed for service, or if you notice exhaust leaks, unusual exhaust smell in the engine bay, or coolant\/water seepage near the manifold joint, since a worn gasket will not reseal reliably once disturbed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra 18-4396 include the thermostat gasket?\u003c\/strong\u003e Yes, a thermostat gasket is included along with the intake exhaust gasket in this set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for Sierra part 18-4396?\u003c\/strong\u003e The UPC for the Sierra 18-4396 Exhaust Manifold Gasket Set is 030999563590.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket set work on any marine engine?\u003c\/strong\u003e No, the 18-4396 set is specific to 250 (4.1L) CID engines, 165 HP, with serial numbers 2770032 and up; confirm your engine's serial number falls in that range before ordering.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988196929755,"sku":"SIE-18-4396","price":54.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4396_lg__23291.1660569172.500.750.jpg?v=1785188393"},{"product_id":"sierra-18-4457-exhaust-protector-valve-4-inch-101-6-mm-replaces-mercury-12644a1-rubber-flapper-check-valve-with-stainless-steel-clamp","title":"Sierra 18-4457 Exhaust Protector Valve, Replaces Mercury Marine 12644A1, 4 Inch EPDM","description":"\u003cp\u003eThe Sierra 18-4457 Exhaust Protector Valve is a rubber flapper-style check valve built to keep water out of an inboard engine's exhaust system. It uses compounded rubber flapper valves that open to let exhaust flow out and close to block water from siphoning back in through the exhaust path when the engine is off or running at low speed. The valve body is made from weather resistant EPDM with a U\/V stabilizer, which helps it hold up against sun exposure, heat cycling, and the marine environment better than untreated rubber. It is sized at 4 inches and ships with a stainless steel clamp, so the hardware needed to secure it in the exhaust line is included in the box.\u003c\/p\u003e\u003cp\u003eThis valve is built to the same fit, form, and function as the original equipment part it replaces and is designed to be interchangeable with GLM 89250, Mallory 9-44001, Mercruiser 13644Q01, and Mercury Marine 12644A1. It is commonly used on inboard exhaust manifold systems, including Chrysler inboard applications. Boat owners typically replace this type of valve when the rubber flapper becomes stiff, cracked, or no longer seals properly, which can allow water intrusion into the exhaust manifold or engine.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4457\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Protector Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 4 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e EPDM with U\/V stabilizer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Hardware:\u003c\/strong\u003e Stainless steel clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.57 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 8 x 6 x 1.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999621863\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Chrysler Inboard Exhaust Manifolds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for inboard exhaust manifold systems, including Chrysler inboard applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 89250\u003c\/li\u003e\n\u003cli\u003eMallory 9-44001\u003c\/li\u003e\n\u003cli\u003eMercruiser 13644Q01\u003c\/li\u003e\n\u003cli\u003eMercury Marine 12644A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-4457 Exhaust Protector Valve do?\u003c\/strong\u003e It is a flapper-style check valve that lets exhaust gas flow out of the engine while blocking water from siphoning back into the exhaust system, protecting the manifold and engine from water intrusion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the 18-4457 valve?\u003c\/strong\u003e The Sierra 18-4457 is a 4 inch exhaust protector valve.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the valve made from?\u003c\/strong\u003e It is made from weather resistant EPDM rubber with a U\/V stabilizer, which helps the flapper valves hold up to sun and heat exposure in a marine exhaust environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-4457 come with mounting hardware?\u003c\/strong\u003e Yes, a stainless steel clamp is included with the Sierra 18-4457 to secure it in the exhaust line.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4457 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-4457 is a Sierra aftermarket part built to match the fit, form, and function of the original equipment valve it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM or other brand part numbers does the 18-4457 replace?\u003c\/strong\u003e The Sierra 18-4457 is designed to be interchangeable with GLM 89250, Mallory 9-44001, Mercruiser 13644Q01, and Mercury Marine 12644A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Mercury Marine 12644A1 the same as the Sierra 18-4457?\u003c\/strong\u003e Yes, the Sierra 18-4457 Exhaust Protector Valve is designed as a direct interchange for Mercury Marine 12644A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4457 exhaust valve weigh?\u003c\/strong\u003e The Sierra 18-4457 weighs 0.57 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-4457 valve?\u003c\/strong\u003e The Sierra 18-4457 measures 8 x 6 x 1.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of exhaust system is the 18-4457 used on?\u003c\/strong\u003e This valve is used on inboard exhaust manifold systems, including Chrysler inboard applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my exhaust protector valve needs to be replaced?\u003c\/strong\u003e If the rubber flapper on your existing valve is cracked, stiff, or no longer sealing, water can enter the exhaust manifold; the Sierra 18-4457 is built to replace a worn valve with the same fit and function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4457 discontinued?\u003c\/strong\u003e No, the Sierra 18-4457 Exhaust Protector Valve is an active, currently available part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988197454043,"sku":"SIE-18-4457","price":32.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4457_lg__56665.1558126579.500.750.jpg?v=1785188798"},{"product_id":"sierra-18-4458-exhaust-protector-valve-for-5in-6in-wet-exhaust-pipe-replaces-glm-89260-mallory-9-44002","title":"Sierra 18-4458 Exhaust Protector Valve, White, 5 Inch and 6 Inch, Replaces GLM 89260","description":"\u003cp\u003eThe Sierra 18-4458 Exhaust Protector Valve is a white exhaust flapper valve built to keep water out of your boat's exhaust system. It uses compounded rubber flapper valves that block water from traveling back up the exhaust hose when the engine is off or idling, protecting the exhaust manifold and engine from water intrusion. The valve is molded from weather resistant EPDM with a UV stabilizer, so it holds up to sun exposure, saltwater, and engine heat without breaking down over time.\u003c\/p\u003e\u003cp\u003eThis valve is sized to fit 5 inch and 6 inch exhaust hose (127 mm and 152.4 mm). The 5 inch size requires two 45 degree cuts to install properly. A stainless steel clamp is included to secure the valve in place. The 18-4458 is the standard, non-display packaged version of this valve; a display packaged version is offered under a separate part number for retail packaging needs. It is a direct interchange for GLM 89260 and Mallory 9-44002 exhaust protector valves, so it can be used as a replacement wherever those valves are specified.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4458\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Protector Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 5 inches and 6 inches (127 mm and 152.4 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e 5 inch size requires two 45 degree cuts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Weather resistant EPDM with UV stabilizer; compounded rubber flapper valves\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Hardware:\u003c\/strong\u003e Stainless steel clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.91 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Non-Display (Display Packaged version available as a separate part number)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned as a direct replacement for exhaust systems using a GLM 89260 or Mallory 9-44002 exhaust protector valve, fitting 5 inch or 6 inch exhaust hose.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 89260\u003c\/li\u003e\n\u003cli\u003eMallory 9-44002\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat sizes does the Sierra 18-4458 exhaust protector valve fit?\u003c\/strong\u003e The 18-4458 fits 5 inch and 6 inch exhaust hose, equal to 127 mm and 152.4 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 5 inch size need any special preparation to install?\u003c\/strong\u003e Yes, when using the 5 inch size of the Sierra 18-4458, two 45 degree cuts are required for a proper fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4458 exhaust protector valve made of?\u003c\/strong\u003e It is made of weather resistant EPDM with a UV stabilizer, with compounded rubber flapper valves that form the water-blocking seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4458 interchangeable with other brands?\u003c\/strong\u003e Yes, the 18-4458 is a direct interchange for GLM 89260 and Mallory 9-44002 exhaust protector valves.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does an exhaust protector valve do?\u003c\/strong\u003e The compounded rubber flapper valves in the Sierra 18-4458 prevent water from entering the exhaust system through the exhaust hose.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-4458 valve?\u003c\/strong\u003e The 18-4458 exhaust protector valve is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4458 come with a clamp?\u003c\/strong\u003e Yes, a stainless steel clamp is included with the 18-4458 exhaust protector valve.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-4458 exhaust protector valve weigh?\u003c\/strong\u003e It weighs 0.91 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4458 weatherproof?\u003c\/strong\u003e Yes, it is molded from weather resistant EPDM with a UV stabilizer, making it suitable for continued sun and saltwater exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-4458 and the 18-4458D?\u003c\/strong\u003e The 18-4458 is the standard, non-display packaged version of this exhaust protector valve, while the 18-4458D is the same valve in display packaging.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988197486811,"sku":"SIE-18-4458","price":60.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-4458__19258.1722498223.500.750.jpg?v=1785188197"},{"product_id":"sierra-18-4456-exhaust-protector-valve-3-in-npt-replaces-mercury-mercruiser-34765a1-glm-89240","title":"Sierra 18-4456 Exhaust Protector Valve - Replaces GLM 89240, Mallory 9-44000, Mercruiser 34765A2\/34765A1","description":"\u003cp\u003eThe Sierra 18-4456 Exhaust Protector Valve is a lift check valve designed to protect an inboard or sterndrive engine's exhaust system from water intrusion. Machined from metal for durability in the marine engine bay, the valve uses 3 inch NPT (National Pipe Tapered) threaded connections and features two ports for inline installation in the exhaust path. Its compact 0.39 x 0.39 x 0.39 inch body allows it to fit into the same mounting space as the original equipment valve it replaces.\u003c\/p\u003e\u003cp\u003eSierra manufactures this valve to meet or exceed original equipment quality, making it a direct functional replacement for the OEM valves listed below. The Sierra 18-4456 is built for reliable, long-term service protecting the engine from backflow of water through the exhaust system.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4456\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Exhaust Protector Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e Lift Check Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Connection Size:\u003c\/strong\u003e 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Connection Type:\u003c\/strong\u003e National Pipe Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Ports:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.43 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999621856\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 89240\u003c\/li\u003e\n\u003cli\u003eMallory 9-44000\u003c\/li\u003e\n\u003cli\u003eMercruiser 34765A2\u003c\/li\u003e\n\u003cli\u003eMercruiser 34765A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4456 Exhaust Protector Valve used for?\u003c\/strong\u003e It is a lift check valve installed in an inboard or sterndrive exhaust system to prevent water from flowing back into the engine, protecting it from water intrusion damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-4456 replace?\u003c\/strong\u003e The Sierra 18-4456 is interchangeable with GLM 89240, Mallory 9-44000, and Mercruiser 34765A2 and 34765A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4456 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra aftermarket replacement valve engineered to meet or exceed the quality of the original equipment part it replaces, including the Mercruiser 34765A2 and 34765A1 valves.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-4456 valve?\u003c\/strong\u003e The valve measures 0.39 x 0.39 x 0.39 inches, a compact size that fits the same mounting space as the original equipment exhaust protector valve.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-4456 Exhaust Protector Valve made from?\u003c\/strong\u003e The 18-4456 is made from machined metal, giving it durability for use in a marine engine's exhaust system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size and type does the Sierra 18-4456 use?\u003c\/strong\u003e It uses a 3 inch NPT (National Pipe Tapered) threaded connection at the inlet.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many ports does the Sierra 18-4456 valve have?\u003c\/strong\u003e The Sierra 18-4456 Exhaust Protector Valve has two ports.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of valve is the Sierra 18-4456?\u003c\/strong\u003e It is a lift check valve, which allows exhaust flow in one direction while blocking water backflow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-4456 weigh?\u003c\/strong\u003e The Sierra 18-4456 Exhaust Protector Valve weighs 0.43 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4456 fit the same applications as the Mercruiser 34765A2 valve?\u003c\/strong\u003e Yes, the Sierra 18-4456 is a direct interchange for the Mercruiser 34765A2 and 34765A1 exhaust protector valves, as well as the GLM 89240 and Mallory 9-44000 equivalents.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-4456 have?\u003c\/strong\u003e The valve has a machined metal finish.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988197617883,"sku":"SIE-18-4456","price":33.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4456_lg__71287.1558126523.500.750.jpg?v=1785188342"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/collections\/EMP-57-57520-MerCruiser-Exhaust-Manifold__80878.1727184128.500.750.jpg?v=1785356948","url":"https:\/\/www.goodvibesmarina.com\/collections\/gvcat-engine-parts-systems-exhaust-system-exhaust-manifolds-gaskets.oembed","provider":"Good Vibes Marina","version":"1.0","type":"link"}