{"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","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2849-exhaust-elbow-gasket-for-mercruiser-center-rise-manifolds-available-single-or-pack-of-2","provider":"Good Vibes Marina","version":"1.0","type":"link"}