{"title":"Head Gaskets \u0026 Gasket Sets","description":null,"products":[{"product_id":"sierra-18-0115-powerhead-base-gasket-replaces-27-f307279-2-fits-force-chrysler-125-150-hp-outboards-pack-of-2","title":"Sierra Powerhead Base Gasket 18-0115, Replaces 27-F307279-2, Fits Chrysler\/Force 150 HP 1989-1994","description":"\u003cp\u003eThe Sierra Powerhead Base Gasket, part number 18-0115, seals the joint between the powerhead and the crankcase on covered Chrysler\/Force outboards, sold as a package of two so you have a spare on hand for the next service interval. A properly seated base gasket is essential to maintaining crankcase compression and preventing air or oil leaks at the powerhead mating surface, both of which can cause hard starting, rough idle, or reduced power if the seal fails.\u003c\/p\u003e\u003cp\u003eThis gasket is a direct equivalent to Chrysler\/Force OEM part 27-F307279-2, so it installs in place of the original without modification. It is designed for the Chrysler\/Force 150 HP outboard built in the 1989-1994 model years within serial number range E000001-E093699. Because base gaskets are a wear item that should be replaced any time the powerhead is removed or reseated, keeping the included pair on hand covers both a current job and a future one.\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 18-0115\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Powerhead Base 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 0.06 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 030999750938\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-F307279-2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eChrysler\/Force 150 HP outboard, 1989-1994, serial number range E000001-E093699\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-F307279-2\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0115 powerhead base gasket fit?\u003c\/strong\u003e Sierra part 18-0115 fits the Chrysler\/Force 150 HP outboard built in the 1989-1994 model years, within serial number range E000001-E093699.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in this package?\u003c\/strong\u003e The 18-0115 powerhead base gasket ships as a package of two, giving you a spare for the next time the powerhead is serviced.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0115 a direct replacement for the original Chrysler\/Force gasket?\u003c\/strong\u003e Yes, 18-0115 replaces OEM part 27-F307279-2 and installs in the same location without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the OEM part number that 18-0115 replaces?\u003c\/strong\u003e It replaces Chrysler\/Force part number 27-F307279-2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the powerhead base gasket weigh?\u003c\/strong\u003e Each package of the 18-0115 base gasket weighs 0.06 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-0115 gasket?\u003c\/strong\u003e The gasket measures approximately 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the powerhead base gasket on my Chrysler\/Force outboard?\u003c\/strong\u003e The 18-0115 base gasket should be replaced any time the powerhead is removed or reseated on a compatible Chrysler\/Force 150 HP outboard, since the seal cannot be reused reliably once broken.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if the powerhead base gasket fails?\u003c\/strong\u003e A failed base gasket can allow air or oil leaks at the powerhead-to-crankcase joint, leading to hard starting, rough idle, or reduced power, which is why Sierra part 18-0115 is stocked as a maintenance replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket brand new or a used part?\u003c\/strong\u003e The Sierra 18-0115 powerhead base gasket is a new replacement part, sold in a sealed package of two.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-0115 fit other Chrysler\/Force horsepower models?\u003c\/strong\u003e 18-0115 is specified for the 150 HP Chrysler\/Force outboard within serial range E000001-E093699; other horsepower or serial ranges use a different Sierra part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the 18-0115 gasket?\u003c\/strong\u003e The Sierra 18-0115 powerhead base gasket carries UPC 030999750938.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988021784795,"sku":"SIE-18-0115","price":2.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0115_lg_1__65944.1558117768.500.750.jpg?v=1785188279"},{"product_id":"exhaust-cover-gasket-for-evinrude-outboards-replaces-oem-325211-mpn-118-0128","title":"Sierra Powerhead Base Gasket 18-0128 for Evinrude Outboard Motors","description":"\u003cp\u003eThe Sierra 18-0128 Powerhead Base Gasket is a replacement gasket designed for Evinrude outboard motors, seated at the base of the powerhead to help maintain a proper seal during operation. As a base gasket, it is a wear item that should be replaced any time the powerhead is removed or serviced, ensuring the mating surfaces seal correctly when the assembly is reinstalled. It is offered as part of Sierra's lineup of Evinrude outboard gasket sets, giving outboard owners and marine technicians a dedicated Sierra part number to order for this specific application.\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 18-0128\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Powerhead Base Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Gasket Sets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999751034\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude outboard motors (powerhead base application)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0128?\u003c\/strong\u003e Sierra 18-0128 is a Powerhead Base Gasket made for Evinrude outboard motors, used to seal the base of the powerhead assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is this gasket used for?\u003c\/strong\u003e It seals the mating surface at the base of the powerhead on Evinrude outboard motors, and is intended to be replaced whenever the powerhead is removed for service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0128 gasket weigh?\u003c\/strong\u003e The Sierra 18-0128 Powerhead Base Gasket weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand of outboard does this gasket fit?\u003c\/strong\u003e This gasket is designed for Evinrude outboard motors and is listed within Sierra's Evinrude outboard gasket sets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0128 the correct part number to order?\u003c\/strong\u003e Yes, 18-0128 is the Sierra part number for this specific Powerhead Base Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0128 gasket sold individually?\u003c\/strong\u003e The 18-0128 is listed as the Powerhead Base Gasket itself, within Sierra's category of Evinrude outboard gasket sets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0128 gasket?\u003c\/strong\u003e The UPC for the Sierra Powerhead Base Gasket, part number 18-0128, is 030999751034.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the powerhead base gasket be replaced?\u003c\/strong\u003e The Sierra 18-0128 Powerhead Base Gasket should be replaced whenever the powerhead is removed from an Evinrude outboard for service, since the old gasket should not be reused.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0128 gasket include installation instructions?\u003c\/strong\u003e No installation instructions are specified for the Sierra 18-0128 Powerhead Base Gasket; it is supplied as the replacement gasket only.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988022997211,"sku":"SIE-18-0128","price":9.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0128_lg__51106.1558118711.500.750.jpg?v=1785329179"},{"product_id":"sierra-18-0133-water-jacket-cover-gasket-for-mercury-outboards-replaces-oem-27-73665","title":"Sierra Water Jacket Gasket 18-0133, Replaces 27-73665 and 27-52892, for 4 Cylinder Outboards","description":"\u003cp\u003eThe Sierra Water Jacket Gasket, part number 18-0133, seals the water jacket cover on 4 cylinder outboard engines, forming the barrier between the cooling passages and the engine block to prevent coolant leaks and maintain proper cooling system pressure. Correct sealing at this joint is essential to preventing overheating and coolant loss, so this gasket is intended to be replaced any time the water jacket cover is removed for service rather than reused. It is manufactured to the dimensions and fit of the original equipment cover it mates to, measuring 0.39 x 0.39 x 0.39 inches and weighing 0.12 pounds, making it a compact, low-cost component that is easy to keep on hand as routine maintenance stock.\u003c\/p\u003e\u003cp\u003eThis gasket is sold individually (priced per piece). Buyers who need multiple units can order the package of 5 by requesting part number 18-0133-9 instead.\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 18-0133\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Jacket Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e 4 Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 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\u003ePackaging:\u003c\/strong\u003e Sold individually; package of 5 available as 18-0133-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-73665, 27-52892\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999754950\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e4 Cylinder outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-73665\u003c\/li\u003e\n\u003cli\u003e27-52892\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0133 gasket fit?\u003c\/strong\u003e The 18-0133 water jacket gasket is designed for 4 cylinder outboard engines, sealing the water jacket cover against the engine block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0133 a direct replacement for OEM gaskets?\u003c\/strong\u003e Yes, part 18-0133 replaces OEM gaskets 27-73665 and 27-52892, so either original number can be used to confirm this is the correct part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-0133 water jacket gasket?\u003c\/strong\u003e This gasket measures 0.39 x 0.39 x 0.39 inches, a compact size consistent with a water jacket cover seal on a 4 cylinder outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0133 gasket weigh?\u003c\/strong\u003e The Sierra 18-0133 water jacket gasket weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I buy the 18-0133 gasket in a multi-pack?\u003c\/strong\u003e The base part 18-0133 is sold individually (priced per piece); for a package of 5, order part number 18-0133-9 instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the water jacket gasket be reused after removing the cover?\u003c\/strong\u003e No, a water jacket gasket like the 18-0133 should be replaced with a new one any time the water jacket cover is removed, since a reused gasket is prone to leaking.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if the water jacket gasket fails?\u003c\/strong\u003e A failed water jacket gasket, such as an old or damaged 18-0133, can allow coolant to leak from the water jacket cover joint, leading to reduced cooling efficiency or overheating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra 18-0133 cross-reference to more than one OEM number?\u003c\/strong\u003e Yes, 18-0133 corresponds to two OEM numbers, 27-73665 and 27-52892, both of which it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0133 gasket genuine Sierra or aftermarket equivalent?\u003c\/strong\u003e The 18-0133 is a Sierra brand part manufactured as a direct-fit replacement for the listed OEM numbers on 4 cylinder outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-0133?\u003c\/strong\u003e An order of 18-0133 includes one water jacket gasket; if the package quantity of 5 is needed, request part 18-0133-9 instead.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988023193819,"sku":"SIE-18-0133","price":5.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0133_lg__43565.1558119003.500.750.jpg?v=1785189212"},{"product_id":"sierra-18-0333-powerhead-base-gasket-replaces-mercury-mariner-27-39401-fits-mercury-mariner-outboards","title":"Sierra Powerhead Base Gasket 18-0333, Replaces Mercury 27-39401, Fits Mercury\/Mariner Outboard Motors","description":"\u003cp\u003eThe Sierra 18-0333 is a powerhead base gasket engineered as a direct replacement for Mercury Marine part number 27-39401. It is designed to fit Mercury and Mariner outboard motors, sealing the joint between the powerhead and the driveshaft housing to maintain proper compression and prevent water or exhaust leakage at this critical junction. A powerhead base gasket is a wear item that should be replaced any time the powerhead is removed for service, since reusing an old gasket can compromise the seal and lead to leaks or reduced performance.\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 18-0333\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Powerhead Base Gasket\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 030999873224\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury outboard motors\u003c\/li\u003e\n\u003cli\u003eMariner outboard motors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-39401\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0333 gasket fit?\u003c\/strong\u003e The Sierra 18-0333 powerhead base gasket is designed to fit Mercury and Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-0333 replace?\u003c\/strong\u003e It replaces Mercury Marine part number 27-39401.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0333 gasket the same as the OEM 27-39401 part?\u003c\/strong\u003e Yes, the Sierra 18-0333 is built to replace Mercury Marine 27-39401 as a direct equivalent for the powerhead base seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0333 gasket weigh?\u003c\/strong\u003e The 18-0333 powerhead base gasket weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the powerhead base gasket installed?\u003c\/strong\u003e The 18-0333 is installed at the base of the powerhead, sealing the joint between the powerhead and the driveshaft housing on Mercury and Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the powerhead base gasket?\u003c\/strong\u003e The 18-0333 should be replaced any time the powerhead is removed from the driveshaft housing for service, since reusing the old gasket can result in a poor seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0333 gasket work on Mariner-branded outboards?\u003c\/strong\u003e Yes, the 18-0333 is designed to fit both Mercury and Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0333 gasket?\u003c\/strong\u003e The Sierra 18-0333 powerhead base gasket carries UPC 030999873224.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0333 a genuine Sierra part or a generic gasket?\u003c\/strong\u003e The 18-0333 is a Sierra-branded powerhead base gasket manufactured to replace Mercury Marine 27-39401.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0333?\u003c\/strong\u003e Ordering the 18-0333 gets you one Sierra powerhead base gasket sized to replace Mercury Marine 27-39401.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988065005787,"sku":"SIE-18-0333","price":2.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0333_lg__93019.1558121069.500.750.jpg?v=1785188228"},{"product_id":"sierra-18-0664-marine-valve-cover-gasket-replaces-mercury-27-17467-omc-3852687-fits-gm-305-350-5-0l-5-7l","title":"Sierra 18-0664 Valve Cover Gasket, Replaces 909529, Fits GM 305\/350 5.0L \u0026 5.7L Engines","description":"\u003cp\u003eThe Sierra 18-0664 is a valve cover gasket engineered to seal the valve cover against the cylinder head on GM 305\/350 cubic-inch marine engines, including 5.0L and 5.7L applications. It creates the seal that keeps oil inside the valve cover assembly and prevents leaks at the cylinder head mating surface, a common failure point on inboard and sterndrive engines that see extended run time and heat cycling.\u003c\/p\u003e\u003cp\u003eEach 18-0664 is sold as a pack of 2, giving you both gaskets needed for a V8 engine's left and right valve covers in a single purchase. Replacing worn valve cover gaskets is a routine maintenance step during valve cover removal for inspection, tappet adjustment, or general engine service, and using a properly sized replacement gasket helps ensure a leak-free reseal.\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 18-0664\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Valve Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GM 305\/350, 5.0L \u0026amp; 5.7L engines\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 808282237189\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM 305\/350 cubic-inch engines\u003c\/li\u003e\n\u003cli\u003e5.0L and 5.7L engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e909529\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0664 fit?\u003c\/strong\u003e The Sierra 18-0664 valve cover gasket fits GM 305\/350 cubic-inch engines, including 5.0L and 5.7L versions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0664 the same gasket as OEM 909529?\u003c\/strong\u003e Yes, the Sierra 18-0664 replaces OEM part number 909529 and is designed as a direct-fit substitute for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets are included with part 18-0664?\u003c\/strong\u003e Part 18-0664 is packaged as a set of 2 gaskets, enough to cover both valve covers on a V8 engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0664 gasket weigh?\u003c\/strong\u003e The Sierra 18-0664 valve cover gasket has a shipping weight of 0.29 pounds for the 2-gasket pack.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need one or two gaskets for my engine?\u003c\/strong\u003e A V8 engine has two valve covers, so you need two gaskets, which is exactly what comes in one pack of the Sierra 18-0664.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part?\u003c\/strong\u003e Yes, this gasket is manufactured and sold under the Sierra brand as part number 18-0664.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse a valve cover gasket after removing the valve cover?\u003c\/strong\u003e Gaskets are generally not reused once removed since they lose their sealing compression; installing a new Sierra 18-0664 gasket at reassembly gives the most reliable seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the function of the valve cover gasket on a GM 305\/350 engine?\u003c\/strong\u003e It seals the joint between the valve cover and the cylinder head, part number 18-0664 being the gasket sized for GM 305\/350, 5.0L and 5.7L engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0664 come as a full gasket set or just the valve cover gasket?\u003c\/strong\u003e The Sierra 18-0664 is specifically a valve cover gasket, sold two to a pack, and is not a complete engine gasket set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM number should I cross-reference when ordering 18-0664?\u003c\/strong\u003e Sierra 18-0664 cross-references to OEM part number 909529.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084404443,"sku":"SIE-18-0664","price":26.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0664_lg__88774.1558120740.500.750.jpg?v=1785188797"},{"product_id":"sierra-18-0767-water-jacket-cover-gasket-for-yamaha-outboard-replaces-oem-688-11193-01-00","title":"Sierra Water Jacket Cover Gasket 18-0767 for Yamaha Outboard Engines","description":"\u003cp\u003eThe Sierra Water Jacket Cover Gasket, part number 18-0767, is a replacement gasket engineered to seal the water jacket cover on applicable Yamaha outboard engines. Positioned in the cooling passage assembly, this gasket creates a reliable seal between the water jacket cover and the engine block, helping prevent coolant leaks and maintain proper cooling system pressure. Installing a correctly sized, properly fitted gasket at this joint is essential to keeping raw water or coolant contained within the intended passages during engine operation.\u003c\/p\u003e\u003cp\u003eThis gasket is manufactured to precise dimensions for a consistent, drop-in fit at the water jacket cover interface. Sierra Marine produces this part under its own part numbering system for the marine aftermarket, giving boat owners and marine technicians a dedicated replacement option when servicing the cooling system on a Yamaha outboard. Because gaskets are wear items that harden, compress, or degrade with heat cycling and time, replacing the water jacket cover gasket whenever the cover is removed for inspection or service helps ensure a leak-free reseal.\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 18-0767\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Yamaha Outboard Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999874641\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.22 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\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eDesigned for applicable Yamaha outboard engines (water jacket cover application)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eNo verified OEM cross-reference number is available for this part\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0767 gasket used for?\u003c\/strong\u003e It seals the water jacket cover on applicable Yamaha outboard engines, sitting between the cover and the engine block to help contain coolant within the cooling passages.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0767 gasket a genuine Sierra part?\u003c\/strong\u003e Yes, 18-0767 is Sierra's own part number for this Water Jacket Cover Gasket, manufactured for the marine aftermarket rather than sold under a third-party label.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the Sierra Water Jacket Cover Gasket?\u003c\/strong\u003e The gasket measures 0.39 x 0.39 x 0.39 inches and weighs 0.22 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does part number 18-0767 fit?\u003c\/strong\u003e This gasket is designed for the water jacket cover application on applicable Yamaha outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra list an OEM cross-reference number for 18-0767?\u003c\/strong\u003e No verified OEM cross-reference number is documented for the Sierra 18-0767 Water Jacket Cover Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need to replace this gasket?\u003c\/strong\u003e Coolant or water seepage around the water jacket cover, visible gasket hardening, or a compressed\/damaged gasket surface after removing the cover are signs the 18-0767 gasket should be replaced.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse the old gasket when reinstalling the water jacket cover?\u003c\/strong\u003e It is best practice to install a new gasket, such as the Sierra 18-0767, any time the water jacket cover is removed, since gaskets are designed as one-time-use sealing components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the package with part 18-0767?\u003c\/strong\u003e The listing includes one Sierra Water Jacket Cover Gasket, part number 18-0767.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket sold individually or as part of a kit?\u003c\/strong\u003e Part number 18-0767 is sold as a single, individual Water Jacket Cover Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the Sierra 18-0767 different from a generic aftermarket gasket?\u003c\/strong\u003e It carries Sierra's own manufacturer part number and is produced to defined dimensions specifically for the water jacket cover application on applicable Yamaha outboards, rather than being a generic, unspecified-fit gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085649627,"sku":"SIE-18-0767","price":18.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0767_lg__43009.1660051588.500.750.jpg?v=1785188485"},{"product_id":"sierra-18-0779-water-jacket-gasket-for-yamaha-outboards-replaces-oem-6g5-11193-a0-00","title":"Sierra 18-0779 Water Jacket Gasket for Yamaha Outboards - Replaces 6G5-11193-A0-00","description":"\u003cp\u003eThe Sierra 18-0779 Water Jacket Gasket is a replacement gasket engineered for Yamaha outboard engines, sealing the water jacket to maintain proper cooling system integrity. Manufactured to meet or exceed original equipment quality, this gasket is a direct interchange for Yamaha part number 6G5-11193-A0-00. Each engine application requires 2 of these gaskets to complete the water jacket seal properly, so buyers should order accordingly for a full repair. The gasket is finished in white and is sold as a single unit per package. Sierra manufactures its marine gaskets to original equipment tolerances, helping ensure a proper seal against coolant leaks and preventing overheating issues caused by a failed or degraded water jacket gasket. This part is intended for technicians and boat owners performing water jacket maintenance, cylinder head service, or general cooling system repair on compatible Yamaha outboard engines. Installing a quality replacement gasket like the 18-0779 helps restore proper sealing after disassembly for maintenance or repair work.\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 18-0779\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Jacket Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\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 0.24 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 6G5-11193-A0-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eYamaha outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e6G5-11193-A0-00\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0779 water jacket gasket fit?\u003c\/strong\u003e The Sierra 18-0779 is designed for Yamaha outboard engines, sealing the water jacket area of the powerhead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-0779 replace?\u003c\/strong\u003e It is a direct interchange for Yamaha part number 6G5-11193-A0-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets do I need for one engine?\u003c\/strong\u003e Each engine application requires 2 of the 18-0779 gaskets, so plan to order enough to cover that quantity.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0779 sold as a single gasket or a set?\u003c\/strong\u003e The 18-0779 is sold as a single water jacket gasket per package, not as part of a multi-piece kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-0779 gasket?\u003c\/strong\u003e This water jacket gasket is white in color.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0779 gasket weigh?\u003c\/strong\u003e The Sierra 18-0779 weighs 0.24 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0779 a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-0779 is a Sierra-manufactured replacement gasket built to meet or exceed the quality of the original Yamaha 6G5-11193-A0-00 equipment it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace the water jacket gasket on a Yamaha outboard?\u003c\/strong\u003e The 18-0779 water jacket gasket should be replaced any time the powerhead is disassembled for service or if the original gasket has failed and is causing a coolant leak or overheating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0779 come with installation instructions?\u003c\/strong\u003e The Sierra 18-0779 is a gasket component intended for installation by someone familiar with Yamaha outboard powerhead service; it does not include a separate instruction sheet.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0779 be used on other engine brands besides Yamaha?\u003c\/strong\u003e The 18-0779 is designed specifically for Yamaha outboard engines using the 6G5-11193-A0-00 water jacket gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085682395,"sku":"SIE-18-0779","price":21.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0779_lg__94038.1558119789.500.750.jpg?v=1785188314"},{"product_id":"sierra-18-0868-marine-intake-manifold-gasket-set-pkg-of-2-replaces-omc-3854269-mercury-27-17145-fits-gm-v-8-305-350-cid-mercruiser-omc-5-7l","title":"Sierra 18-0868 Intake Manifold Gasket Set, Replaces 16.50-00232, Fits MCM\/MIE GM V-8 305 \u0026 350 cid Engines","description":"\u003cp\u003eThe Sierra 18-0868 intake manifold gasket set seals the intake manifold to the engine block on compatible marine engines, providing the gasket surface needed to prevent coolant, oil, or combustion leaks at this joint. It is sold as a package of 2 gaskets, giving a complete matched set for a single intake manifold installation or reseal job. The set is built as a direct replacement for OEM part number 16.50-00232, so it installs in place of the original equipment gasket without modification.\u003c\/p\u003e\u003cp\u003eThis gasket set is designed for MCM\/MIE GM V-8 engines in 305 and 350 cubic inch displacement, 1975 and newer, and also fits OMC 5.7L engines from the 1994 and 1996-1997 model years. Boat owners and marine technicians use it during intake manifold removal, engine rebuilds, or when addressing a leaking or failed intake gasket. Confirming your engine matches the GM V-8 305\/350 cid or OMC 5.7L applications listed, or cross-referencing to OEM 16.50-00232, is the best way to verify fit 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 18-0868\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Intake Manifold Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Package of 2 gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.31 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 030999755131\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 16.50-00232\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMCM\/MIE GM V-8 305 and 350 cid engines, 1975 and newer\u003c\/li\u003e\n\u003cli\u003eOMC 5.7L engines, 1994, 1996-1997\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e16.50-00232\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-0868 gasket set replace?\u003c\/strong\u003e The Sierra 18-0868 intake manifold gasket set replaces OEM number 16.50-00232.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets are included in the 18-0868 set?\u003c\/strong\u003e This set is sold as a package of 2 gaskets, providing a complete matched pair for an intake manifold installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does the Sierra 18-0868 gasket set fit?\u003c\/strong\u003e It fits MCM\/MIE GM V-8 engines in 305 and 350 cubic inch displacement (1975 and newer), as well as OMC 5.7L engines from 1994 and 1996-1997.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket set fit an OMC 5.7L engine?\u003c\/strong\u003e Yes, the 18-0868 set is designed to fit OMC 5.7L engines from the 1994 and 1996-1997 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0868 fit MerCruiser MCM\/MIE engines?\u003c\/strong\u003e Yes, it fits MCM\/MIE GM V-8 305 and 350 cid engines built in 1975 and newer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0868 gasket set weigh?\u003c\/strong\u003e The 18-0868 intake manifold gasket set weighs 0.31 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-0868 gasket set?\u003c\/strong\u003e The set measures 0.39 x 0.39 x 0.39 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0868 an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is an aftermarket gasket set manufactured by Sierra, engineered as a direct replacement for OEM 16.50-00232.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0868 gasket set?\u003c\/strong\u003e You receive a package of 2 intake manifold gaskets, the complete set needed for one intake manifold installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm the 18-0868 is the correct gasket for my engine?\u003c\/strong\u003e Match your engine to MCM\/MIE GM V-8 305 or 350 cid (1975 and newer) or OMC 5.7L (1994, 1996-1997), or cross-reference to OEM number 16.50-00232.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085813467,"sku":"SIE-18-0868","price":31.38,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0868_lg__64758.1558119292.500.750.jpg?v=1785188366"},{"product_id":"timing-cover-gasket-18-0887-for-volvo-penta-marine-engines-cam-gear-cover-gasket","title":"Sierra 18-0887 Timing Cover Gasket for GM 4.3L, 5.0L \u0026 5.7L Engines, Replaces 3852654, 3853512","description":"\u003cp\u003eThe Sierra 18-0887 Timing Cover Gasket seals the timing cover against the engine block on GM 4.3L, 5.0L, and 5.7L marine engines, preventing oil leaks at this critical junction. It is a direct-fit replacement gasket designed to restore a proper seal when the original gasket has hardened, cracked, or begun leaking from age and heat cycling. Installing a fresh timing cover gasket during a timing cover removal, timing chain service, or general engine reseal helps ensure the cover seats correctly and holds oil pressure without seepage.\u003c\/p\u003e\u003cp\u003eThis gasket is manufactured to match the mounting pattern and sealing surface of the OEM GM timing cover gasket, cross-referencing directly to OEM part numbers 3852654 and 3853512. Because it is a precise fit replacement, no modification to the timing cover or engine block is required during installation. Boat owners and marine mechanics use it as a maintenance part whenever the timing cover is removed for inspection, repair, or replacement of related timing components.\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 18-0887\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Timing Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Compatibility:\u003c\/strong\u003e GM 4.3L, 5.0L \u0026amp; 5.7L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 3852654, 3853512\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM 4.3L engines\u003c\/li\u003e\n\u003cli\u003eGM 5.0L engines\u003c\/li\u003e\n\u003cli\u003eGM 5.7L engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e3852654\u003c\/li\u003e\n\u003cli\u003e3853512\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0887 timing cover gasket fit?\u003c\/strong\u003e The Sierra 18-0887 timing cover gasket fits GM 4.3L, 5.0L, and 5.7L marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this gasket replace?\u003c\/strong\u003e Sierra 18-0887 replaces OEM GM part numbers 3852654 and 3853512.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0887 a direct OEM replacement?\u003c\/strong\u003e Yes, the Sierra 18-0887 is a direct cross-reference replacement for OEM timing cover gaskets 3852654 and 3853512, so no modification is needed for installation on compatible GM engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the timing cover gasket weigh?\u003c\/strong\u003e The Sierra 18-0887 timing cover gasket weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this gasket be replaced?\u003c\/strong\u003e This gasket should be replaced any time the timing cover is removed from a GM 4.3L, 5.0L, or 5.7L marine engine, such as during timing chain service or if the original gasket is leaking oil.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this gasket be reused after removing the timing cover?\u003c\/strong\u003e No, a timing cover gasket like the Sierra 18-0887 should be replaced with a new one any time the timing cover is removed, since reusing a compressed gasket can result in oil leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0887 fit both carbureted and fuel-injected GM 4.3L, 5.0L, and 5.7L engines?\u003c\/strong\u003e The Sierra 18-0887 is listed as fitting GM 4.3L, 5.0L, and 5.7L engines generally, based on displacement rather than fuel delivery type.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand is part number 18-0887?\u003c\/strong\u003e Part number 18-0887 is manufactured by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket seal correctly without additional sealant?\u003c\/strong\u003e The Sierra 18-0887 is designed to match the OEM sealing surface and pattern of gaskets 3852654 and 3853512 for proper sealing when installed per standard timing cover installation procedures.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0887 gasket sold individually?\u003c\/strong\u003e The Sierra 18-0887 timing cover gasket is a single gasket part matched to GM 4.3L, 5.0L, and 5.7L timing covers.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086141147,"sku":"SIE-18-0887","price":4.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0887_lg_1__71421.1558121132.500.750.jpg?v=1785329144"},{"product_id":"sierra-18-1237-oil-pan-gasket-replaces-mercruiser-27-13865-1-omc-volvo-penta-3856138-crusader-7090380","title":"Sierra Oil Pan Gasket, Replaces 3852655, for Volvo 4.3L - 18-1237","description":"\u003cp\u003eThe Sierra 18-1237 Oil Pan Gasket is a direct-fit replacement gasket engineered for the Volvo 4.3L marine engine. It seals the mating surface between the oil pan and the engine block, preventing oil leaks and maintaining proper crankcase pressure. Built to meet or exceed the quality of the original equipment part it replaces, this gasket is designed as a straightforward drop-in swap during routine maintenance, oil pan removal, or engine rebuild work on Volvo 4.3L applications.\u003c\/p\u003e\u003cp\u003eThis gasket carries a white finish and is sized for the Volvo 4.3L oil pan, with overall packaged dimensions of 32.75 x 10.13 x 1.38 inches and a shipping weight of 1.42 pounds. It directly replaces OEM part number 3852655, so it installs using the same bolt pattern and sealing surfaces as the original gasket 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 18-1237\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Oil Pan Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Volvo 4.3L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 3852655\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.42 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 32.75 x 10.13 x 1.38 inches\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 808282236922\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eVolvo 4.3L\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3852655\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-1237 oil pan gasket fit?\u003c\/strong\u003e The Sierra 18-1237 oil pan gasket is designed for the Volvo 4.3L marine engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-1237 replace?\u003c\/strong\u003e Sierra 18-1237 directly replaces OEM part number 3852655.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the OEM part 3852655 the same as the Sierra 18-1237?\u003c\/strong\u003e Yes, the Sierra 18-1237 is a direct-fit equivalent to OEM number 3852655 and installs the same way.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is this oil pan gasket?\u003c\/strong\u003e The Sierra 18-1237 oil pan gasket has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1237 oil pan gasket weigh?\u003c\/strong\u003e Sierra part 18-1237 weighs 1.42 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-1237 gasket?\u003c\/strong\u003e The packaged dimensions of the Sierra 18-1237 oil pan gasket are 32.75 x 10.13 x 1.38 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1237 gasket meet original equipment quality?\u003c\/strong\u003e Sierra manufactures the 18-1237 oil pan gasket to meet or exceed the quality of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-1237 gasket fit other engines besides the Volvo 4.3L?\u003c\/strong\u003e The Sierra 18-1237 is specified for the Volvo 4.3L engine; fitment beyond that application is not specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes with the Sierra 18-1237 oil pan gasket?\u003c\/strong\u003e The Sierra 18-1237 is supplied as a single oil pan gasket for the Volvo 4.3L engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1237 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-1237 is a genuine Sierra-branded gasket manufactured as a replacement for OEM part 3852655, not an OEM Volvo part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087222491,"sku":"SIE-18-1237","price":43.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1237_lg__22321.1558119516.500.750.jpg?v=1785188355"},{"product_id":"sierra-18-1274-head-gasket-set-for-chevy-153-2-5l-181-3-0l-4-cyl-marine-engines-replaces-mallory-9-61705","title":"Sierra 18-1274 Head Gasket Set for Chevy 4 Cyl 153\/2.5L and 181\/3.0L Marine Engines","description":"\u003cp\u003eThe Sierra 18-1274 Head Gasket Set is a complete gasket kit for servicing Chevy 4 cylinder 153\/2.5L and 181\/3.0L marine engines. It bundles the head gasket along with the carburetor and thermostat housing gaskets needed for a full top-end reseal in one package, so installers do not have to source each gasket separately. The set is built to meet or exceed the original equipment parts it replaces and is cross-referenced to the Mallory 9-61705 gasket set for buyers who know that number from a prior parts search.\u003c\/p\u003e\u003cp\u003eThis kit covers Chevy 4 cyl 153\/2.5L engines as well as Chevy 4 cyl 181\/3.0L engines, including the 181\/3.0L HO variant, making it a practical stock item for shops and owners servicing multiple engine variants without carrying separate part numbers for each. Each gasket in the set is dimensioned for its specific mounting location (head, carburetor, Mercarb, and thermostat housing) so the correct gasket is used at each joint during 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 18-1274\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.37 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Head Gasket 18-2946, Mercarb Mounting Gasket 18-0994, Carburetor Mounting Gasket 18-0356, Thermostat Housing Gasket 18-0164\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross Reference:\u003c\/strong\u003e Mallory 9-61705\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eChevy 4 cyl 153\/2.5L, 1965-1988\u003c\/li\u003e\n\u003cli\u003eChevy 4 cyl 181\/3.0L, 1973-1984\u003c\/li\u003e\n\u003cli\u003eChevy 4 cyl 181\/3.0L, 1985-1989\u003c\/li\u003e\n\u003cli\u003eChevy 4 cyl 181\/3.0L HO, 1990-1998\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMallory 9-61705\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1274 head gasket set fit?\u003c\/strong\u003e The Sierra 18-1274 head gasket set fits Chevy 4 cyl 153\/2.5L engines from 1965-1988 and Chevy 4 cyl 181\/3.0L engines from 1973-1984 and 1985-1989, including the 181\/3.0L HO variant from 1990-1998.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-1274 gasket set?\u003c\/strong\u003e Four gaskets are included: a head gasket (18-2946), a Mercarb mounting gasket (18-0994), a carburetor mounting gasket (18-0356), and a thermostat housing gasket (18-0164).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 181\/3.0L HO engine use the same gasket set as the standard 181\/3.0L?\u003c\/strong\u003e Yes, the Sierra 18-1274 set covers the Chevy 4 cyl 181\/3.0L HO engine built 1990-1998 in addition to the standard 181\/3.0L applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1274 compatible with a Mallory 9-61705 gasket set?\u003c\/strong\u003e Yes, the Sierra 18-1274 head gasket set is cross-referenced and interchangeable with the Mallory 9-61705 gasket set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1274 head gasket set weigh?\u003c\/strong\u003e The Sierra 18-1274 head gasket set weighs 0.37 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a thermostat housing gasket included with this kit?\u003c\/strong\u003e Yes, a thermostat housing gasket (part 18-0164) is one of the four gaskets included in the Sierra 18-1274 set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-1274 gasket set?\u003c\/strong\u003e The gaskets in the Sierra 18-1274 set are white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1274 set include a carburetor gasket for a Mercarb carburetor?\u003c\/strong\u003e Yes, the set includes a Mercarb mounting gasket (18-0994) in addition to a separate carburetor mounting gasket (18-0356) for other carburetor types.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-1274 gasket set fit a Chevy 153\/2.5L engine built in 1970?\u003c\/strong\u003e Yes, the Sierra 18-1274 covers Chevy 4 cyl 153\/2.5L engines built from 1965 through 1988, which includes 1970.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1274 an OEM or aftermarket part?\u003c\/strong\u003e The Sierra 18-1274 is an aftermarket head gasket set built to meet or exceed the original equipment parts it replaces on Chevy 4 cyl 153\/2.5L and 181\/3.0L marine engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087255259,"sku":"SIE-18-1274","price":73.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1274_lg__65706.1558121255.500.750.jpg?v=1785188574"},{"product_id":"sierra-18-1239-oil-pan-gasket-replaces-mercruiser-27-810846t-fits-3-0l-gm-181-mercruiser-omc-volvo-penta","title":"Sierra Oil Pan Gasket 18-1239, Replaces Mercury Marine 27-810846T, Fits OMC 3.0L\/LX","description":"\u003cp\u003eThe Sierra 18-1239 is a marine oil pan gasket engineered to seal the oil pan on OMC 3.0L and 3.0L\/LX engines. It is designed as a direct cross-reference for Mercury Marine part 27-810846T, giving boat owners and marine technicians a reliable option when the oil pan needs to come off for service, inspection, or repair. The gasket is finished in white and is sold as a single unit, ready to install without additional trimming or fabrication.\u003c\/p\u003e\u003cp\u003eA properly sealed oil pan gasket is essential to keeping engine oil contained and preventing leaks that can lead to low oil pressure, fouled bilges, or contamination of other engine components. The Sierra 18-1239 is built to the fit and dimensions of the engine oil pan it is designed for, so it seats correctly against the mating surfaces during reassembly. Because it carries a limited warranty, it is intended as a dependable replacement part rather than a universal or trimmable 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 18-1239\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Pan Gasket\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\u003eWeight:\u003c\/strong\u003e 0.4 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282242954\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00808282242954\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-810846T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e OMC 3.0L, 3.0L\/LX\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits OMC 3.0L and 3.0L\/LX engines.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003e27-810846T (Mercury Marine)\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1239 oil pan gasket fit?\u003c\/strong\u003e The Sierra 18-1239 fits OMC 3.0L and 3.0L\/LX engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1239 the same as Mercury Marine 27-810846T?\u003c\/strong\u003e Yes, the Sierra 18-1239 is a direct cross-reference for Mercury Marine part number 27-810846T.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-1239 oil pan gasket?\u003c\/strong\u003e It is white, matching the finish used on this Sierra oil pan gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1239 weigh?\u003c\/strong\u003e The Sierra 18-1239 oil pan gasket weighs 0.4 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of the Sierra 18-1239?\u003c\/strong\u003e Each package of the Sierra 18-1239 contains one oil pan gasket, sold as a single unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-1239 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-1239 oil pan gasket is backed by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the Sierra 18-1239 as a genuine equivalent to the Mercury Marine part?\u003c\/strong\u003e The Sierra 18-1239 is manufactured as a cross-reference replacement for Mercury Marine 27-810846T, intended to fit and seal in the same application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1239 oil pan gasket?\u003c\/strong\u003e The UPC for the Sierra 18-1239 is 808282242954.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-1239 fit a 3.0L\/LX engine specifically?\u003c\/strong\u003e Yes, the 3.0L\/LX designation is one of the two fitments listed for the Sierra 18-1239 oil pan gasket, alongside the OMC 3.0L.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace the oil pan gasket on my OMC 3.0L engine?\u003c\/strong\u003e An oil pan gasket like the Sierra 18-1239 typically needs replacement when the pan is removed for service or when it shows signs of an oil leak at the pan mating surface.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087288027,"sku":"SIE-18-1239","price":107.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1239_lg__55738.1558119640.500.750.jpg?v=1785188048"},{"product_id":"sierra-18-1254-vortec-head-gasket-set-replaces-mercruiser-27-75611a03-for-small-block-gm-v8-305-350-377-cid-1996-newer","title":"Sierra 18-1254 Vortec Head Gasket Set, Replaces 27-75611A03, GM Small Block V8","description":"\u003cp\u003eThe Sierra 18-1254 Vortec Head Gasket Set is a complete head gasket set built for small block GM V8 engines equipped with Vortec heads, including MCM\/MIE GM V-8 305, 350 and 377 cid Gen+ engines from 1996 and newer. It is engineered to meet the demands of high horsepower marine engines and to hold up in the harsh marine operating environment, sealing the cylinder head to the block to maintain compression and prevent coolant or oil leakage at the head joint.\u003c\/p\u003e\u003cp\u003eThis is a direct replacement for OEM number 27-75611A03, so it installs using the factory bolt pattern and sealing surfaces without modification. As with all Sierra parts, it is built to meet or exceed the performance of the original equipment part it replaces, and it is backed by Sierra's industry leading customer satisfaction warranty. Boat owners and marine technicians use this set during head gasket replacement, engine rebuilds, or top-end overhaul work on compatible small block V8 engines.\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 18-1254\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Vortec Head Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Small Block GM V8 engines with Vortec heads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Engines:\u003c\/strong\u003e MCM\/MIE GM V-8 305, 350 \u0026amp; 377 cid Gen+ engines (1996 and Newer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal Fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 27-75611A03\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.36 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 808282304768\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Covered under Sierra's customer satisfaction warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSmall Block GM V8 engines with Vortec heads\u003c\/li\u003e\n\u003cli\u003eMCM\/MIE GM V-8 305, 350 \u0026amp; 377 cid Gen+ engines (1996 and Newer)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-75611A03\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1254 head gasket set fit?\u003c\/strong\u003e The Sierra 18-1254 Vortec Head Gasket Set fits small block GM V8 engines with Vortec heads, including MCM\/MIE GM V-8 305, 350 and 377 cid Gen+ engines from 1996 and newer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-1254 replace?\u003c\/strong\u003e It is a direct replacement for OEM number 27-75611A03.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1254 head gasket set weigh?\u003c\/strong\u003e The Sierra 18-1254 Vortec Head Gasket Set weighs 1.36 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1254 a complete head gasket set?\u003c\/strong\u003e Yes, 18-1254 is sold as a complete Vortec head gasket set for small block GM V8 engines, not an individual gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket set work on a non-Vortec small block GM head?\u003c\/strong\u003e The 18-1254 set is designed specifically for small block GM V8 engines with Vortec heads, so it is intended for that head configuration rather than earlier non-Vortec head designs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra 18-1254 come with a warranty?\u003c\/strong\u003e Yes, the 18-1254 Vortec Head Gasket Set is covered under Sierra's customer satisfaction warranty like all Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-1254 a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e 18-1254 is a genuine Sierra part, engineered and sold under the Sierra brand to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-1254 gasket set packaging?\u003c\/strong\u003e The product measures 0.39 x 0.39 x 0.39 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-1254 for a top-end engine rebuild?\u003c\/strong\u003e Yes, the Vortec Head Gasket Set is commonly used during head gasket replacement, engine rebuilds, or top-end overhaul work on compatible GM small block V8 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1254 set fit both MCM and MIE engine configurations?\u003c\/strong\u003e Yes, it is listed as fitting MCM\/MIE GM V-8 305, 350 and 377 cid Gen+ engines, 1996 and newer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the Sierra 18-1254 set?\u003c\/strong\u003e The 18-1254 is a head gasket set for small block GM V8 engines with Vortec heads, covering the head gasket sealing components for that engine platform.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087320795,"sku":"SIE-18-1254","price":167.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1254__73338.1722354035.500.750.jpg?v=1785188313"},{"product_id":"sierra-18-1277-head-gasket-set-for-mercury-marine-engines-intake-head-exhaust-manifold-gaskets-plus-valve-stem-seals","title":"Sierra 18-1277 Head Gasket Set for Mercruiser 470, 485, and 488 Engines","description":"\u003cp\u003eThe Sierra 18-1277 Head Gasket Set is a complete engine gasket kit built for Mercruiser 470, 485, and 488 stern drive engines. Rather than a single-piece gasket, this is a full kit designed to cover an engine rebuild or major service, pairing a head gasket with the intake, exhaust, valve cover, and carburetor base gaskets plus a full set of valve stem seals, so an installer is not stuck sourcing individual gaskets separately. The kit uses a generic-type gasket design that is common across engine brands, allowing the same short block and valve grind gasket sets to be used with different exhaust manifold gasket kits depending on the application, which helps consolidate the parts needed to keep on hand for these engines.\u003c\/p\u003e\u003cp\u003eInside the kit are six distinct components: an intake manifold gasket, a carburetor base gasket, a head gasket, eight valve stem seals, a valve cover gasket, and an exhaust manifold gasket. This gives a rebuilder the core sealing components needed for the top end of the engine in one kit. The set is finished in white and is sold as a single kit (1 count).\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 18-1277\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket Set\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 0.87 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282233808\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e 1 intake manifold gasket (18-0158), 1 carburetor base gasket (18-2848), 1 head gasket (18-3878), 8 valve stem seals (18-4023), 1 valve cover gasket (18-0685), 1 exhaust manifold gasket (18-0956-1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 470, 1976-82\u003c\/li\u003e\n\u003cli\u003eMercruiser 470, 1983-84\u003c\/li\u003e\n\u003cli\u003eMercruiser 485, 1980-82\u003c\/li\u003e\n\u003cli\u003eMercruiser 488, 1983-84\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1277 Head Gasket Set fit?\u003c\/strong\u003e It fits Mercruiser 470 engines built 1976-82 and 1983-84, Mercruiser 485 engines built 1980-82, and Mercruiser 488 engines built 1983-84.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-1277 Head Gasket Set?\u003c\/strong\u003e The kit includes one intake manifold gasket (18-0158), one carburetor base gasket (18-2848), one head gasket (18-3878), eight valve stem seals (18-4023), one valve cover gasket (18-0685), and one exhaust manifold gasket (18-0956-1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1277 Head Gasket Set weigh?\u003c\/strong\u003e The Sierra 18-1277 Head Gasket Set weighs 0.87 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-1277 Head Gasket Set?\u003c\/strong\u003e This gasket kit is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1277 kit include head bolts?\u003c\/strong\u003e No, the Sierra 18-1277 Head Gasket Set contains gaskets and valve stem seals only; head bolts are not among the six components in the kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many valve stem seals come in the 18-1277 kit?\u003c\/strong\u003e Eight valve stem seals (part 18-4023) are included in the Sierra 18-1277 Head Gasket Set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1277 gasket set made by Sierra?\u003c\/strong\u003e Yes, part number 18-1277 is manufactured by Sierra as a complete head gasket set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-1277 exhaust manifold gasket be swapped for a different exhaust configuration?\u003c\/strong\u003e Yes, the Sierra 18-1277 kit uses the same short block and valve grind gasket sets that can be paired with different exhaust manifold gasket kits depending on the specific application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a single gasket or a full kit?\u003c\/strong\u003e The Sierra 18-1277 is a full head gasket set with six components, not a single gasket, covering the intake, head, valve cover, carburetor base, valve stems, and exhaust manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many units come in one order of 18-1277?\u003c\/strong\u003e Each order of the Sierra 18-1277 Head Gasket Set is one complete kit (1 count).\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087484635,"sku":"SIE-18-1277","price":126.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1277_lg__70349.1753456081.500.750.jpg?v=1785187986"},{"product_id":"sierra-18-2512-9-crankcase-gasket-pack-of-5-replaces-mercury-27-60286-for-mercury-outboards","title":"Sierra Crankcase Gasket 18-2512-9, Replaces Mercury 27-60286, 3 Cylinder, Pack of 5","description":"\u003cp\u003eThe Sierra 18-2512-9 Crankcase Gasket seals the crankcase to the cylinder block on 3 cylinder outboard engines. It is sold as a package of five gaskets, giving you enough on hand for a full rebuild or for keeping spares for future service work. The gasket is made from a glass material formed into a round shape designed to seat properly against the mating crankcase and cylinder block surfaces, helping maintain a proper seal and prevent leaks between these two components.\u003c\/p\u003e\u003cp\u003eEach Sierra 18-2512-9 gasket is built to meet or exceed the quality of the original equipment part it replaces, making it a reliable choice for engine maintenance and rebuild jobs. Because the crankcase-to-cylinder-block seal is critical to engine compression and oil containment, using a properly fitted replacement gasket like this one helps ensure a dependable repair. This part replaces Mercury 27-60286.\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 18-2512-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDescription:\u003c\/strong\u003e Crankcase to Cylinder Block Gasket, 3 Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 5\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\u003eWeight:\u003c\/strong\u003e 0.05 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282162603\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3 cylinder outboard engines (crankcase to cylinder block application)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-60286\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2512-9 gasket fit?\u003c\/strong\u003e The Sierra 18-2512-9 is a crankcase to cylinder block gasket designed for 3 cylinder outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this gasket replace?\u003c\/strong\u003e The 18-2512-9 replaces Mercury 27-60286.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e Each package of the Sierra 18-2512-9 contains 5 crankcase gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2512-9 gasket made from?\u003c\/strong\u003e It is made from a glass material, formed in a round shape to seal the crankcase to cylinder block joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2512-9 weigh?\u003c\/strong\u003e The package weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2512-9 an OEM or aftermarket gasket?\u003c\/strong\u003e It is an aftermarket Sierra replacement gasket built to meet or exceed the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere on the engine does this gasket install?\u003c\/strong\u003e The 18-2512-9 seals the joint between the crankcase and the cylinder block on a 3 cylinder engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I buy the Sierra 18-2512-9 gasket individually instead of a 5-pack?\u003c\/strong\u003e The 18-2512-9 is sold only as a package of 5 gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the shape of the 18-2512-9 gasket?\u003c\/strong\u003e It is round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2512-9 gasket require any adhesive or sealant during installation?\u003c\/strong\u003e The dossier does not specify additional sealant requirements for the 18-2512-9; follow your engine manufacturer's service procedure when installing the crankcase gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988106817755,"sku":"SIE-18-2512-9","price":9.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2512-9__35253.1722514843.500.750.jpg?v=1785188276"},{"product_id":"sierra-18-2544-9-water-jacket-cover-gasket-2-pack-replaces-omc-315538-fits-evinrude-johnson-50-55-hp-outboards","title":"Sierra Water Jacket Gasket 18-2544-9, Replaces 321028, Fits Evinrude 50\/55 HP Outboards, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2544-9 is a water jacket gasket sold as a pack of two, engineered to seal the water jacket cover on Evinrude 50\/55 HP outboards. It is built to Sierra's quality standard using materials selected for consistent sealing performance and long service life in the marine cooling system. This gasket sits between the water jacket cover and the powerhead, maintaining a tight seal around the cooling passages so the engine's raw water circuit stays leak-free and the powerhead cools properly during operation.\u003c\/p\u003e\u003cp\u003eBecause it ships two to a pack, the 18-2544-9 covers a complete gasket replacement in one purchase, which is useful when servicing both sides of the water jacket or keeping a spare on hand for the next service interval. It directly replaces OEM part number 321028, so it installs as a drop-in equivalent during routine maintenance, cooling system service, or when troubleshooting an overheating or leaking outboard.\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 18-2544-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Jacket Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Evinrude 50\/55 HP outboards\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 321028\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.41 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Other\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 54.864 cm x 17.018 cm x 0.762 cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282162795\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude 50\/55 HP outboards\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e321028\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2544-9 water jacket gasket fit?\u003c\/strong\u003e The 18-2544-9 is designed to fit Evinrude 50\/55 HP outboards, sealing the water jacket cover on the powerhead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2544-9 the same as OEM part 321028?\u003c\/strong\u003e Yes, Sierra part 18-2544-9 replaces OEM number 321028 and serves as a direct equivalent for that gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a pack of the 18-2544-9?\u003c\/strong\u003e Two gaskets are included per pack, priced and sold as a single 2-pack unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2544-9 gasket pack weigh?\u003c\/strong\u003e The pack weighs 0.41 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-2544-9 gasket made of?\u003c\/strong\u003e Sierra lists the material for the 18-2544-9 water jacket gasket as Other, a composite gasket material suited to sealing cooling system components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this water jacket gasket?\u003c\/strong\u003e Replacement is typically needed when servicing the water jacket cover, addressing a coolant leak, or performing routine maintenance on the cooling passages of a 50\/55 HP Evinrude outboard, where the 18-2544-9 seals the cover to the powerhead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2544-9 include installation hardware?\u003c\/strong\u003e No, the package includes only the two water jacket gaskets; it does not include mounting bolts or additional hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use one 18-2544-9 pack for a full water jacket service?\u003c\/strong\u003e Since the pack contains two gaskets, one 18-2544-9 pack is enough to cover a standard water jacket cover replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2544-9 an OEM or aftermarket part?\u003c\/strong\u003e The 18-2544-9 is a Sierra aftermarket gasket manufactured to replace OEM number 321028 on applicable Evinrude 50\/55 HP outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engine application is the 18-2544-9 gasket designed for?\u003c\/strong\u003e It is designed for Evinrude 50\/55 HP outboard engines, specifically sealing the water jacket cover in the cooling system.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988107112667,"sku":"SIE-18-2544-9","price":13.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2544-9__94194.1737860880.500.750.jpg?v=1785188436"},{"product_id":"water-jacket-cover-gasket-27-72142-1-for-mercury-outboards-sierra-18-2573","title":"Sierra Water Jacket Cover Gasket 18-2573, Replaces 27-721421, Fits 6 Cyl. Mercury Outboard Engines, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2573 Water Jacket Cover Gasket is designed to seal the water jacket cover on 6 cylinder Mercury outboard engines, sealing the cooling passage against leaks between the cover and the engine block. A proper water jacket seal is essential to maintaining correct cooling system pressure and preventing coolant loss or overheating, so this gasket is a standard replacement item whenever the water jacket cover is removed for inspection, cleaning, or service. Each package contains 2 gaskets, giving you a spare on hand or enough for a job that calls for more than one. This part is sold under Sierra part number 18-2573 and cross-references directly to the original Mercury gasket numbers 27-721421, 27-72142, and 27-60475, so it installs as a direct replacement without modification. Keeping the correct gasket on hand simplifies routine water jacket cover maintenance and helps avoid downtime from a failed or hardened original gasket. Because gaskets compress and can lose their seal over time, replacing the water jacket cover gasket during any cover removal is good practice rather than reusing the old one.\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 18-2573\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Jacket Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.22 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999562753\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e6 cylinder Mercury outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-721421\u003c\/li\u003e\n\u003cli\u003e27-72142\u003c\/li\u003e\n\u003cli\u003e27-60475\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2573 gasket fit?\u003c\/strong\u003e The Sierra 18-2573 Water Jacket Cover Gasket fits 6 cylinder Mercury outboard engines, sealing the water jacket cover to the engine block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM numbers does 18-2573 replace?\u003c\/strong\u003e Sierra 18-2573 directly replaces Mercury gasket numbers 27-721421, 27-72142, and 27-60475.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of 18-2573?\u003c\/strong\u003e Each package of the Sierra 18-2573 Water Jacket Cover Gasket contains 2 gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2573 gasket weigh?\u003c\/strong\u003e The Sierra 18-2573 Water Jacket Cover Gasket weighs 0.22 pounds per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2573 a genuine Mercury part or an aftermarket equivalent?\u003c\/strong\u003e Sierra 18-2573 is an aftermarket gasket manufactured to match the dimensions and sealing performance of the original Mercury water jacket cover gasket, cross-referencing to Mercury numbers 27-721421, 27-72142, and 27-60475.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the water jacket cover gasket?\u003c\/strong\u003e Any time the water jacket cover is removed from a 6 cylinder Mercury outboard for service or inspection, the gasket should be replaced with a new one such as the Sierra 18-2573 rather than reused, since a compressed or hardened gasket will not reseal properly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if the water jacket cover gasket fails?\u003c\/strong\u003e A failed water jacket cover gasket can allow coolant to leak from the sealing surface, which can lead to loss of cooling capacity and overheating in the 6 cylinder Mercury outboard it is installed on.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2573 gasket require sealant during installation?\u003c\/strong\u003e The Sierra 18-2573 Water Jacket Cover Gasket is installed at the water jacket cover mating surface as a standard replacement gasket for this application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2573 gasket?\u003c\/strong\u003e The UPC for the Sierra 18-2573 Water Jacket Cover Gasket is 030999562753.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I order just one gasket instead of the pack of 2?\u003c\/strong\u003e The Sierra 18-2573 Water Jacket Cover Gasket is sold as a package of 2 gaskets; it is not available as a single unit under this part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988107407579,"sku":"SIE-18-2573","price":6.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2573_lg__48420.1558123286.500.750.jpg?v=1785329192"},{"product_id":"sierra-18-2815-push-rod-cover-gasket-for-mercruiser-120-140-4-cyl-stamped-lifter-side-cover","title":"Sierra Push Rod Cover Gasket 18-2815 for MCM 120\/140 4 Cylinder Stamped Lifter Side Cover","description":"\u003cp\u003eThe Sierra 18-2815 Push Rod Cover Gasket is a single-piece sealing gasket designed to fit between the push rod cover and the stamped lifter side cover on MCM 120\/140 4 cylinder marine engines. It creates the seal needed to keep oil contained around the push rod area, preventing leaks at this common wear point. The gasket is finished in white and is supplied as a single unit, making it a straightforward replacement part for routine engine maintenance or a full gasket refresh.\u003c\/p\u003e\u003cp\u003eThis gasket is manufactured to fit the specific dimensions and bolt pattern of the MCM 120\/140 stamped lifter side cover, so it installs in the same location as the original equipment gasket without modification. Because it is designed specifically for this application, it helps restore a proper seal and reduce the risk of oil seepage that can occur when an old or hardened gasket is reused. It is backed by Sierra's customer satisfaction warranty coverage.\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 18-2815\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Push Rod Cover Gasket\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\u003eWeight:\u003c\/strong\u003e 0.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282243760\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC (alternate):\u003c\/strong\u003e 707390478784\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMCM 120\/140 (4 cylinder) engines with stamped lifter side cover\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2815 push rod cover gasket fit?\u003c\/strong\u003e The Sierra 18-2815 push rod cover gasket is designed for MCM 120\/140 4 cylinder engines equipped with a stamped lifter side cover.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of 18-2815?\u003c\/strong\u003e One gasket is included per unit of Sierra part number 18-2815, listed as a single-count item.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-2815 gasket?\u003c\/strong\u003e It is white, as manufactured by Sierra for this push rod cover application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2815 gasket weigh?\u003c\/strong\u003e This gasket weighs 0.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2815 gasket a genuine Sierra part?\u003c\/strong\u003e Yes, part number 18-2815 is a genuine Sierra push rod cover gasket, not a generic substitute.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2815 gasket fit a standard (non-stamped) lifter side cover?\u003c\/strong\u003e No, this gasket is designed specifically for the stamped lifter side cover configuration on MCM 120\/140 4 cylinder engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2815 covered under warranty?\u003c\/strong\u003e Sierra parts, including the 18-2815 push rod cover gasket, are covered under Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-2815?\u003c\/strong\u003e Ordering 18-2815 includes one push rod cover gasket; no additional hardware is included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the push rod cover gasket on my MCM 120\/140?\u003c\/strong\u003e Replace the Sierra 18-2815 gasket whenever the push rod cover is removed for service or if oil seepage is noticed around the stamped lifter side cover, since the original gasket should not be reused once disturbed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2815 the correct part number to search for this gasket?\u003c\/strong\u003e Yes, 18-2815 is the Sierra part number for this specific push rod cover gasket used on MCM 120\/140 4 cylinder engines with a stamped lifter side cover.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988129886427,"sku":"SIE-18-2815","price":25.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2815_lg__53402.1558122678.500.750.jpg?v=1785188459"},{"product_id":"sierra-exhaust-elbow-gasket-18-2832-1-9-replaces-oem-27-39915-pack-of-2","title":"Sierra Front\/End Plate Gasket 18-2832-1-9, Replaces 27-48043-1, Fits Manifolds 18-1958-1 \u0026 18-1962-1","description":"\u003cp\u003eThe Sierra 18-2832-1-9 is a front\/end plate gasket used to seal the front plate assembly on compatible exhaust manifolds in marine engine applications. It is made from a stainless steel infused graphite material, chosen for its superior compressibility, which helps the gasket conform to mating surfaces and maintain a reliable seal under the heat and vibration typical of an inboard exhaust system.\u003c\/p\u003e\u003cp\u003eThis gasket fits the port and starboard caps of manifolds 18-1958-1 and 18-1962-1, and is designed for use with front plate 18-4009. It is also included as a component within the 18-8512 mounting kit, so owners assembling or servicing that kit already have this gasket included, while those replacing the gasket individually can order it under its own part number. As a Sierra part, it is built to correspond with the OEM cross-reference 27-48043-1 for straightforward identification when sourcing a 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 18-2832-1-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Front\/End Plate Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless, Graphite, Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifolds:\u003c\/strong\u003e 18-1958-1, 18-1962-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e Front Plate 18-4009\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded In:\u003c\/strong\u003e 18-8512 Mounting Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-48043-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282369422\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits port and starboard caps of manifolds 18-1958-1 and 18-1962-1\u003c\/li\u003e\n\u003cli\u003eUse with front plate 18-4009\u003c\/li\u003e\n\u003cli\u003eIncluded in 18-8512 mounting kit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-48043-1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2832-1-9 gasket used for?\u003c\/strong\u003e It is a front\/end plate gasket that seals the front plate assembly on compatible exhaust manifolds, part number 18-2832-1-9 from Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich manifolds does this gasket fit?\u003c\/strong\u003e The 18-2832-1-9 fits the port and starboard caps of manifolds 18-1958-1 and 18-1962-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket fit both the port and starboard side?\u003c\/strong\u003e Yes, this single gasket, 18-2832-1-9, fits both the port and starboard caps of manifolds 18-1958-1 and 18-1962-1, so the same part number covers either side.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2832-1-9 replace?\u003c\/strong\u003e It corresponds to OEM cross-reference number 27-48043-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is this gasket made of?\u003c\/strong\u003e A stainless steel infused graphite material is used, selected for superior compressibility to help the gasket seal reliably.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The Sierra 18-2832-1-9 gasket weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other part is this gasket used with?\u003c\/strong\u003e It is designed for use with front plate 18-4009 as part of the front\/end plate assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket included in any mounting kits?\u003c\/strong\u003e Yes, the 18-2832-1-9 gasket is included as a component of the 18-8512 mounting kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to buy this gasket separately if I already purchased the 18-8512 mounting kit?\u003c\/strong\u003e No, if the 18-8512 mounting kit was purchased, the 18-2832-1-9 gasket is already included in that kit; it only needs to be ordered separately for a standalone replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2832-1-9 a genuine Sierra part?\u003c\/strong\u003e Yes, it is manufactured and sold under the Sierra brand as part number 18-2832-1-9.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this Sierra gasket?\u003c\/strong\u003e The UPC for the 18-2832-1-9 gasket is 808282369422.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988131164379,"sku":"SIE-18-2832-1-9","price":9.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2832-1__49442.1737897703.500.750.jpg?v=1785188894"},{"product_id":"sierra-18-2845-valve-cover-gasket-for-gm-305-350-cid-5-0l-5-7l-v-8-replaces-mercruiser-27-11999-and-chris-craft-16-11-01236","title":"Sierra 18-2845 Valve Cover Gasket for GM 305\/350 CID 5.0L and 5.7L Engines","description":"\u003cp\u003eThe Sierra 18-2845 is a white valve cover gasket engineered as a direct fit for GM 305\/350 CID (5.0L and 5.7L) marine engines. It seals the mating surface between the valve cover and cylinder head to prevent oil leaks and keep contaminants out of the valvetrain, and it is built to meet or exceed the specification of the original equipment part it replaces. The gasket is manufactured from glass material in a round profile designed to match the factory valve cover bolt pattern and sealing surface on these applications.\u003c\/p\u003e\u003cp\u003eBecause valve cover gaskets are a routine maintenance and repair item, this part is commonly replaced whenever a valve cover is removed for service or when an existing gasket has hardened, cracked, or begun to weep oil. It is cross-referenced to a wide range of OEM and aftermarket equivalents, making it easy to match against a part already on the engine. As a Sierra-manufactured component, it is backed by Sierra's standard customer satisfaction 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 18-2845\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Valve Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Glass\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\u003eUPC:\u003c\/strong\u003e 030999313539\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.19 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM 305\/350 CID (5.0L and 5.7L) engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eChris-Craft 16.11-01236\u003c\/li\u003e\n\u003cli\u003eCrusader 91351\u003c\/li\u003e\n\u003cli\u003eGLM 30353\u003c\/li\u003e\n\u003cli\u003eMallory 9-61300\u003c\/li\u003e\n\u003cli\u003eMercruiser Stern Drive 27-11999\u003c\/li\u003e\n\u003cli\u003eMercruiser Stern Drive 27-34043\u003c\/li\u003e\n\u003cli\u003eMercruiser Stern Drive 27-52202\u003c\/li\u003e\n\u003cli\u003eMercruiser FI1101236\u003c\/li\u003e\n\u003cli\u003eMercruiser FI5000161\u003c\/li\u003e\n\u003cli\u003eOMC Stern Drive 912965\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2845 valve cover gasket fit?\u003c\/strong\u003e The 18-2845 is designed for GM 305\/350 CID (5.0L and 5.7L) marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2845 an OEM part or aftermarket equivalent?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket gasket built to meet or exceed the original equipment part it replaces, rather than an OEM-branded piece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2845 valve cover gasket made from?\u003c\/strong\u003e This gasket is made from glass material, formed into a round profile that matches the factory valve cover sealing surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2845 gasket?\u003c\/strong\u003e It is white, which is the standard color Sierra produces this gasket in.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2845 valve cover gasket weigh?\u003c\/strong\u003e The 18-2845 weighs 0.19 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does the 18-2845 cross-reference to?\u003c\/strong\u003e It is interchangeable with Chris-Craft 16.11-01236, Crusader 91351, GLM 30353, Mallory 9-61300, Mercruiser Stern Drive 27-11999, 27-34043, and 27-52202, Mercruiser FI1101236 and FI5000161, and OMC Stern Drive 912965.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes one 18-2845 gasket cover both valve covers?\u003c\/strong\u003e Each 18-2845 is a single valve cover gasket, so a typical V-8 installation with two valve covers requires two gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the valve cover gasket on my GM 305\/350 marine engine?\u003c\/strong\u003e Replace the 18-2845 whenever the valve cover is removed for service, or sooner if the existing gasket has hardened, cracked, or is showing signs of an oil leak at the cover seam.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2845 covered under warranty?\u003c\/strong\u003e Yes, the Sierra 18-2845 valve cover gasket is covered under Sierra's standard customer satisfaction warranty, as are all Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2845?\u003c\/strong\u003e You receive one Sierra 18-2845 white valve cover gasket; it does not include mounting hardware or other engine gaskets.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988131197147,"sku":"SIE-18-2845","price":24.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2845_lg__37220.1558122916.500.750.jpg?v=1785188074"},{"product_id":"water-jacket-gasket-2-pack-for-evinrude-25-35-hp-outboards-replaces-oem-319665-sierra-18-2856-9","title":"Sierra Water Jacket Gasket 18-2856-9, Replaces 319665, Fits Evinrude 25\/35 HP Outboards, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2856-9 Water Jacket Gasket seals the water jacket on Evinrude 25\/35 HP outboard engines, maintaining proper cooling system sealing between mating engine surfaces. This gasket is sold as a package of 2, giving you a spare on hand for a future service or allowing you to complete a job that calls for more than one gasket. It directly replaces OEM part number 319665, so it installs as a drop-in match during a water jacket service or cooling system rebuild. Using the correct water jacket gasket is important for preventing coolant leaks and maintaining consistent engine temperature, which protects the powerhead from overheating damage. The gasket is designed to fit the mating surfaces of the specified Evinrude 25\/35 HP outboard application precisely, so it seats correctly without modification. At 0.11 pounds for the package, it is a lightweight, low-cost maintenance part that belongs in any Evinrude outboard owner's spare parts kit or service toolbox alongside other gaskets for the same engine family.\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 18-2856-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Jacket Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.11 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282163617\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Gasket Sets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude 25\/35 HP outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e319665\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2856-9 water jacket gasket fit?\u003c\/strong\u003e The Sierra 18-2856-9 is designed for Evinrude 25\/35 HP outboard engines, sealing the water jacket on the powerhead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket cross-reference to an OEM part number?\u003c\/strong\u003e Yes, the Sierra 18-2856-9 replaces OEM number 319665.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e The 18-2856-9 is sold as a package of 2 water jacket gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2856-9 gasket package weigh?\u003c\/strong\u003e The package weighs 0.11 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2856-9 an OEM or aftermarket gasket?\u003c\/strong\u003e It is a Sierra aftermarket gasket manufactured to replace OEM number 319665 on Evinrude 25\/35 HP outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this product?\u003c\/strong\u003e The UPC for the Sierra 18-2856-9 water jacket gasket package is 808282163617.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-2856-9 gasket for a future repair as a spare?\u003c\/strong\u003e Yes, since the 18-2856-9 comes 2 to a package, one gasket can be installed now and the second kept on hand as a spare.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat system does this gasket seal on the outboard?\u003c\/strong\u003e The 18-2856-9 seals the water jacket, which is part of the engine's cooling system, on Evinrude 25\/35 HP outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2856-9 fit outboards other than the 25\/35 HP Evinrude?\u003c\/strong\u003e The Sierra 18-2856-9 is specified for Evinrude 25\/35 HP outboard engines; check the OEM number 319665 against your engine's parts manual to confirm fit on other applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a gasket sealant needed when installing the 18-2856-9?\u003c\/strong\u003e The listing does not specify a required sealant; follow your engine service manual's procedure when installing the Sierra 18-2856-9 water jacket gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988131786971,"sku":"SIE-18-2856-9","price":9.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2856-9__98209.1737862170.500.750.jpg?v=1785329191"},{"product_id":"sierra-18-2864-9-powerhead-base-gasket-pack-of-2-replaces-oem-330621-johnson-evinrude-25-35-hp-outboards","title":"Sierra 18-2864-9 Powerhead Base Gasket, Replaces 321727, Fits Johnson\/Evinrude V-4 25\/35 HP Outboards, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2864-9 is a powerhead base gasket sold as a pack of two, designed to seal the base of the powerhead on Johnson and Evinrude V-4 outboard engines rated 25\/35 HP. This gasket sits between the powerhead and the engine block, forming the critical seal that keeps combustion pressure, oil, and coolant properly contained during operation. A worn, cracked, or compressed base gasket is a common source of oil seepage, loss of compression, or overheating on these outboards, and replacing it with the correct Sierra part restores the factory seal.\u003c\/p\u003e\u003cp\u003eSierra manufactures this gasket to meet or exceed the specifications of the original equipment part it replaces, giving it a reliable fit and consistent sealing performance without modification to surrounding components. Because it ships two to a package, buyers performing a full powerhead service have enough material on hand without needing a second order, and the pack covers engines that use two gaskets per rebuild or a spare for a future 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 18-2864-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Powerhead Base Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Johnson\/Evinrude V-4 outboards, 25\/35 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 321727\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude V-4 outboards, 25\/35 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e321727\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2864-9 powerhead base gasket fit?\u003c\/strong\u003e This gasket fits Johnson and Evinrude V-4 outboard engines rated 25\/35 HP.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a pack?\u003c\/strong\u003e The 18-2864-9 is sold as a pack of two powerhead base gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2864-9 replace an OEM Johnson\/Evinrude part number?\u003c\/strong\u003e Yes, it replaces OEM part number 321727.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2864-9 gasket genuine OEM or aftermarket?\u003c\/strong\u003e It is an aftermarket Sierra replacement gasket, manufactured to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the powerhead base gasket weigh?\u003c\/strong\u003e The 18-2864-9 pack weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a powerhead base gasket used for?\u003c\/strong\u003e A powerhead base gasket seals the joint between the outboard powerhead and the engine block, containing combustion pressure, oil, and coolant so the engine runs without leaks or loss of compression.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill I need one or two of these gaskets for a single engine rebuild?\u003c\/strong\u003e Since the 18-2864-9 ships two per pack, one package supplies both gaskets typically needed for a Johnson\/Evinrude V-4 powerhead service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat signs indicate the powerhead base gasket needs replacing?\u003c\/strong\u003e Oil seepage at the base of the powerhead, loss of compression, or overheating on a Johnson\/Evinrude V-4 25\/35 HP outboard are common signs the 18-2864-9 gasket needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-2864-9 gasket something a DIY mechanic can do?\u003c\/strong\u003e Replacing a powerhead base gasket requires removing the powerhead from the engine block, so it is a more involved job typically done during a full teardown or rebuild rather than a quick DIY swap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2864-9 come with a warranty?\u003c\/strong\u003e Yes, this Sierra powerhead base gasket is covered under Sierra's standard customer satisfaction warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132081883,"sku":"SIE-18-2864-9","price":26.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2864-9__73844.1737827435.500.750.jpg?v=1785188912"},{"product_id":"sierra-18-2873-9-water-jacket-gasket-replaces-oem-318334-fits-v-4-johnson-evinrude-outboards-pack-of-2","title":"Sierra 18-2873-9 Water Jacket Gasket, Replaces 318335, V-4 Johnson\/Evinrude Outboard, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2873-9 Water Jacket Gasket seals the water jacket on V-4 Johnson and Evinrude outboard engines, sitting between the powerhead and cylinder block to maintain the cooling water passage and prevent leaks at this joint. It is sold as a pack of 2, giving you a spare or enough material for both a repair and a future service without a second purchase. The gasket is black in color and is designed as a direct fit for the water jacket location on applicable V-4 Johnson and Evinrude outboards, replacing the original equipment gasket bearing part number 318335.\u003c\/p\u003e\u003cp\u003eThis is a maintenance-grade sealing component intended for use during powerhead service, cylinder block reassembly, or when addressing a water jacket leak. Because it is packaged in a set of 2, it also suits shops or owners servicing more than one engine, or who want a gasket on hand for the next teardown.\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 18-2873-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Jacket Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e V-4\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 0.26 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282163785\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eV-4 Johnson and Evinrude outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e318335\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2873-9 water jacket gasket fit?\u003c\/strong\u003e The 18-2873-9 is designed for V-4 Johnson and Evinrude outboard engines, sealing the water jacket between the powerhead and cylinder block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this gasket replace?\u003c\/strong\u003e It replaces original equipment part number 318335 on applicable V-4 Johnson and Evinrude outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of 18-2873-9?\u003c\/strong\u003e Each package contains 2 water jacket gaskets, so you get a spare or enough for a repeat service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2873-9 gasket?\u003c\/strong\u003e It is black, matching the appearance of the original water jacket gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2873-9 water jacket gasket weigh?\u003c\/strong\u003e The Sierra 18-2873-9, packaged as a set of 2, weighs 0.26 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2873-9 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is an aftermarket replacement gasket manufactured by Sierra to fit in place of the original 318335 water jacket gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace the water jacket gasket on my outboard?\u003c\/strong\u003e This gasket is typically replaced during powerhead service or cylinder block reassembly, or if a water jacket leak develops on a V-4 Johnson or Evinrude outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2873-9 come with any other gaskets or hardware?\u003c\/strong\u003e The package includes only the 2 water jacket gaskets identified by part number 18-2873-9; no additional hardware is included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-2873-9 gasket on both Johnson and Evinrude engines?\u003c\/strong\u003e Yes, the Sierra 18-2873-9 is made to fit V-4 Johnson and Evinrude outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2873-9 water jacket gasket?\u003c\/strong\u003e The UPC for this pack of 2 gaskets is 808282163785.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132606171,"sku":"SIE-18-2873-9","price":7.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sierra_lg_1271__19886.1558123208.500.750.jpg?v=1785188131"},{"product_id":"sierra-18-2885-head-gasket-for-evinrude-outboard-replaces-oem-315539","title":"Sierra Head Gasket 18-2885, Replaces 303438, for Evinrude Outboard Power Heads","description":"\u003cp\u003eThe Sierra Head Gasket 18-2885 is a power head gasket engineered for Evinrude outboard engines. It seals the mating surface between the cylinder block and cylinder head, maintaining proper compression and preventing coolant or combustion leaks at the power head. This gasket is a direct equivalent for OEM part number 303438, making it a straightforward replacement when rebuilding or servicing an Evinrude outboard power head.\u003c\/p\u003e\u003cp\u003eEach gasket is sold as a single unit and is part of Sierra's line of Evinrude outboard power head gaskets, a category built around exact-fit sealing components for outboard engine rebuilds. Installing a proper power head gasket is a key step in restoring compression and preventing leaks after a head has been removed for service, inspection, or repair.\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 18-2885\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Power Head Gaskets\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 0.14 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999313928\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 303438\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Evinrude outboard power heads.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e303438\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does Sierra part number 18-2885 fit?\u003c\/strong\u003e Sierra 18-2885 is a head gasket for Evinrude outboard power heads, used when resealing the cylinder head to the cylinder block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2885 the same as OEM part 303438?\u003c\/strong\u003e Yes, Sierra 18-2885 directly replaces OEM number 303438, so it can be installed in place of that original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of 18-2885?\u003c\/strong\u003e One gasket is included per package for Sierra part number 18-2885.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2885 head gasket weigh?\u003c\/strong\u003e The Sierra 18-2885 head gasket weighs 0.14 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for Sierra 18-2885?\u003c\/strong\u003e The UPC for this head gasket is 030999313928.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should a power head gasket like 18-2885 be replaced?\u003c\/strong\u003e A power head gasket such as the Sierra 18-2885 should be replaced any time the cylinder head is removed from an Evinrude outboard power head, or if compression loss or leakage is found at the head-to-block joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or aftermarket?\u003c\/strong\u003e Sierra 18-2885 is manufactured by Sierra as a replacement gasket engineered to match the fit and sealing performance of OEM part 303438.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2885 gasket require any additional sealant?\u003c\/strong\u003e The dossier does not specify sealant requirements for the Sierra 18-2885 head gasket, so follow the engine manufacturer's service procedure for the power head being resealed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engine brand is the 18-2885 gasket designed for?\u003c\/strong\u003e The Sierra 18-2885 head gasket is categorized specifically for Evinrude outboard power heads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse an old head gasket instead of buying 18-2885?\u003c\/strong\u003e Head gaskets like the Sierra 18-2885 are designed for one-time use and should be replaced with a new gasket, such as this one, whenever the head is removed.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132704475,"sku":"SIE-18-2885","price":7.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2885_lg__67776.1558124573.500.750.jpg?v=1785188612"},{"product_id":"sierra-18-2946-marine-head-gasket-for-gm-181-cid-3-0l-replaces-mercruiser-27-52364-chris-craft-16-50-00204","title":"Sierra 18-2946 Head Gasket - Replaces 16.50-00204 for GM 181 CID (3.0L) Marine Engines","description":"\u003cp\u003eThe Sierra 18-2946 Head Gasket is a marine-grade replacement gasket engineered for GM 181 CID (3.0L) engines used in stern drive and inboard marine applications. It is designed to seal the mating surface between the cylinder head and engine block, maintaining proper compression, coolant containment, and oil control under the sustained heat and vibration cycles typical of marine service. Using a gasket built specifically for the marine environment, rather than an automotive substitute, helps ensure a reliable, long-term seal against the corrosion and thermal stress that saltwater and freshwater cooling systems introduce.\u003c\/p\u003e\u003cp\u003eThe 18-2946 is a direct fit for GM 181 CID (3.0L) engines and is a cross-reference match for the OEM 16.50-00204 gasket, allowing it to be installed as a like-for-like replacement during a head gasket service, engine rebuild, or head removal for valve or manifold work. Each Sierra product is built to meet or exceed the performance of the original equipment part it replaces, giving boat owners and marine technicians a dependable option when the factory gasket has failed or the engine is being serviced.\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 18-2946\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM Cross-Reference):\u003c\/strong\u003e 16.50-00204\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e GM 181 CID Engine (3.0L)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.61 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\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM 181 CID Engine (3.0L)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e16.50-00204\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-2946 head gasket fit?\u003c\/strong\u003e The 18-2946 head gasket is designed for GM 181 CID (3.0L) marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2946 a direct OEM replacement?\u003c\/strong\u003e Yes, it directly replaces OEM part number 16.50-00204 and is built to meet or exceed the original equipment part's performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2946 head gasket weigh?\u003c\/strong\u003e It weighs 0.61 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2946 head gasket?\u003c\/strong\u003e It is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of the 18-2946?\u003c\/strong\u003e The 18-2946 is sold as a single-unit head gasket, with a unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2946 be used on other GM engine sizes like the 305 or 350 CID?\u003c\/strong\u003e No, the 18-2946 is specified for GM 181 CID (3.0L) engines; larger GM 305\/350 and 454 CID engines use different Sierra head gasket part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2946 require any special gasket sealant during installation?\u003c\/strong\u003e A dedicated gasket sealant is recommended for proper installation of the 18-2946, though the sealant itself is a separate product.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2946 suitable for both engine rebuilds and single head gasket replacement jobs?\u003c\/strong\u003e Yes, this Sierra head gasket can be used for a full engine rebuild or a standalone head gasket replacement on a GM 181 CID (3.0L) engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2946 cross-reference to?\u003c\/strong\u003e It cross-references to OEM number 16.50-00204.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2946 a genuine OEM part or an aftermarket equivalent?\u003c\/strong\u003e The 18-2946 is a Sierra-manufactured aftermarket gasket engineered to meet or exceed the performance of the original 16.50-00204 OEM gasket it replaces.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135325915,"sku":"SIE-18-2946","price":109.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2946_lg__51286.1558124415.500.750.jpg?v=1785187988"},{"product_id":"head-gasket-for-johnson-evinrude-9-5-hp-outboard-1964-1973-replaces-oem-309612-766870-sierra-18-2950-2-pack","title":"Sierra 18-2950 Head Gasket - Replaces 309612, 766870 - Johnson\/Evinrude 9.5 HP Outboards 1964-1973","description":"\u003cp\u003eThe Sierra 18-2950 is a head gasket engineered for Johnson and Evinrude 9.5 HP outboard engines built from 1964 to 1973. It seals the cylinder head to the power head, maintaining compression and preventing coolant or combustion leakage at the head joint, which is essential to reliable engine operation on these older Johnson\/Evinrude 9.5 HP outboards. The gasket is manufactured to meet or exceed the fit and performance of the original equipment part it replaces, directly interchanging with Johnson\/Evinrude OEM numbers 309612 and 766870. The 18-2950 is sold as a package of 2 head gaskets, making it a practical choice for shops or owners servicing more than one power head or keeping a spare on hand. Because it is designed specifically around the dimensions and bolt pattern of the original 9.5 HP power head, it installs as a direct replacement without modification. Whether performing a routine power head rebuild, addressing a compression loss issue, or doing preventive maintenance on a vintage Johnson or Evinrude 9.5 HP outboard, the 18-2950 provides an exact-fit, OEM-equivalent 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 18-2950\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 head gaskets per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 309612, 766870\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Johnson\/Evinrude 9.5 HP outboards (1964-1973)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999314505\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude 9.5 HP outboards (1964-1973)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e309612\u003c\/li\u003e\n\u003cli\u003e766870\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2950 head gasket fit?\u003c\/strong\u003e The 18-2950 is designed for Johnson and Evinrude 9.5 HP outboard engines built from 1964 to 1973.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2950 replace?\u003c\/strong\u003e It directly replaces Johnson\/Evinrude OEM numbers 309612 and 766870.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e The Sierra 18-2950 is sold as a package of 2 head gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2950 head gasket weigh?\u003c\/strong\u003e Each package weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2950 an OEM or aftermarket part?\u003c\/strong\u003e It is an aftermarket head gasket manufactured by Sierra to meet or exceed the specifications of the original Johnson\/Evinrude 309612 and 766870 head gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2950 fit a newer Johnson or Evinrude outboard?\u003c\/strong\u003e No, the 18-2950 is specified for Johnson\/Evinrude 9.5 HP outboards from 1964 to 1973 only; newer power heads use a different head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the head gasket do on a 9.5 HP Johnson\/Evinrude outboard?\u003c\/strong\u003e It seals the joint between the cylinder head and power head on the 9.5 HP engine, maintaining compression and preventing coolant or combustion leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when you order the 18-2950?\u003c\/strong\u003e The order includes a package of 2 Sierra 18-2950 head gaskets, with no additional hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2950 the correct part if my old gasket is stamped 309612?\u003c\/strong\u003e Yes, the Sierra 18-2950 is the direct replacement for a Johnson\/Evinrude 309612 head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2950 the correct part if my old gasket is stamped 766870?\u003c\/strong\u003e Yes, the Sierra 18-2950 also replaces the Johnson\/Evinrude 766870 head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2950 be reused after removal?\u003c\/strong\u003e Head gaskets, including the 18-2950, are designed as a one-time seal and should be replaced with a new gasket any time the cylinder head is removed.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135424219,"sku":"SIE-18-2950","price":20.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2950_lg__24009.1558124846.500.750.jpg?v=1785188269"},{"product_id":"sierra-18-2952-head-gasket-replaces-omc-203034-for-johnson-evinrude-7-5-hp-outboard-1957-1958","title":"Sierra 18-2952 Head Gasket, Replaces 203034, for Johnson\/Evinrude 7.5 HP (1957-1958) Outboard Motors","description":"\u003cp\u003eThe Sierra 18-2952 Head Gasket is a replacement head gasket engineered for Johnson\/Evinrude 7.5 HP outboard motors from 1957-1958. It seals the cylinder head to the powerhead block, maintaining proper compression and preventing coolant or combustion leaks between mating surfaces. This gasket is a direct interchange for the OEM Johnson\/Evinrude part number 203034, making it a straightforward replacement when rebuilding or servicing the powerhead.\u003c\/p\u003e\u003cp\u003eSierra manufactures this gasket to meet or exceed the specifications of the original equipment part it replaces, so fit and sealing performance match what the engine was designed around. It is sold as a single unit and is lightweight at 0.05 pounds, consistent with a compact 7.5 HP powerhead application. As with all Sierra parts, it is backed by Sierra's standard customer satisfaction 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 18-2952\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 pounds\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 030999314529\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude 7.5 HP (1957-1958)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e203034\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2952 head gasket fit?\u003c\/strong\u003e This head gasket is designed for Johnson\/Evinrude 7.5 HP outboard motors from 1957-1958.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-2952 replace OEM part 203034?\u003c\/strong\u003e Yes, Sierra 18-2952 is a direct interchange for Johnson\/Evinrude OEM number 203034.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2952 head gasket weigh?\u003c\/strong\u003e It weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e The 18-2952 is sold as a single unit, a unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2952 an OEM part or aftermarket?\u003c\/strong\u003e It is an aftermarket Sierra-manufactured gasket built to meet or exceed the original equipment part it replaces, OEM number 203034.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the function of the 18-2952 head gasket?\u003c\/strong\u003e It seals the cylinder head to the engine block on the applicable Johnson\/Evinrude 7.5 HP powerhead, maintaining compression and preventing leaks between the mating surfaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2952 gasket covered by a warranty?\u003c\/strong\u003e Yes, Sierra 18-2952 is covered under Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2952 head gasket?\u003c\/strong\u003e The UPC is 030999314529.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2952 fit other Johnson\/Evinrude horsepower models besides the 7.5 HP?\u003c\/strong\u003e The 18-2952 is specified for Johnson\/Evinrude 7.5 HP (1957-1958) outboards; no other horsepower or year applications are listed for this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-2952 different from similar Sierra head gaskets like 18-2951 or 18-2954?\u003c\/strong\u003e Each of these Sierra head gasket part numbers replaces a different OEM number, so 18-2952 (replacing 203034) is not interchangeable with 18-2951 or 18-2954, which cover different OEM equivalents.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135456987,"sku":"SIE-18-2952","price":16.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2952_lg__37144.1558124966.500.750.jpg?v=1785189121"},{"product_id":"sierra-18-2956-water-jacket-head-gasket-for-johnson-evinrude-outboards-replaces-oem-318358","title":"Sierra 18-2956 Water Jacket Head Gasket for Johnson\/Evinrude Outboard Motors, Replaces 0339620","description":"\u003cp\u003eThe Sierra 18-2956 is a water jacket head gasket engineered for Johnson and Evinrude outboard motor applications. It seals the cylinder head against the engine block, maintaining proper compression and directing coolant flow through the water jacket passages to keep the powerhead running at the correct operating temperature. Each package contains one gasket, sized and cut to seat correctly against the mating surfaces of the applicable Johnson\/Evinrude powerhead.\u003c\/p\u003e\u003cp\u003eThis gasket is manufactured to meet or exceed the performance of the original equipment part it replaces, making it a reliable choice for a head gasket replacement during a powerhead rebuild or routine maintenance. It is finished in white and is a direct fit for the Johnson\/Evinrude applications it is designed for.\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 18-2956\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Jacket Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Johnson\/Evinrude outboard motors\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 gasket per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999314550\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eJohnson and Evinrude outboard motor applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e0339620\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2956 head gasket fit?\u003c\/strong\u003e The Sierra 18-2956 is designed for Johnson and Evinrude outboard motor applications, where it serves as the water jacket head gasket between the cylinder head and engine block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2956 replace?\u003c\/strong\u003e The Sierra 18-2956 water jacket head gasket replaces OEM number 0339620.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e Each package of the Sierra 18-2956 contains one water jacket head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-2956 gasket?\u003c\/strong\u003e It is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2956 head gasket weigh?\u003c\/strong\u003e The Sierra 18-2956 weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2956 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-2956 is a Sierra-manufactured replacement gasket built to meet or exceed the performance of the original equipment water jacket head gasket it replaces, rather than a part sourced directly from Johnson or Evinrude.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is this gasket used for during installation?\u003c\/strong\u003e The 18-2956 seals the mating surface between the cylinder head and engine block on applicable Johnson\/Evinrude outboards, maintaining compression and proper coolant flow through the water jacket during a head gasket or powerhead rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2956 include installation hardware or bolts?\u003c\/strong\u003e No, the package includes only the water jacket head gasket itself; no bolts or additional hardware are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-2956 on any Johnson or Evinrude outboard?\u003c\/strong\u003e The 18-2956 is designed specifically for Johnson and Evinrude outboard motor applications; confirm the OEM number 0339620 against your engine's original gasket before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2956?\u003c\/strong\u003e The UPC for the Sierra 18-2956 head gasket is 030999314550.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135489755,"sku":"SIE-18-2956","price":18.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2956_lg__87878.1558125094.500.750.jpg?v=1785188101"},{"product_id":"sierra-18-2961-marine-head-gasket-replaces-oem-329103-for-johnson-evinrude-6-hp-outboards-1960-1979","title":"Sierra 18-2961 Head Gasket for Johnson\/Evinrude 6 HP Outboard, 1965-79","description":"\u003cp\u003eThe Sierra 18-2961 Head Gasket is a replacement head gasket engineered for Johnson and Evinrude 6 HP outboard motors from 1965-79. It seats between the cylinder head and the power head to seal the combustion chamber and coolant passages, maintaining proper compression and preventing coolant or exhaust leaks at the head joint. This gasket is a direct fit for the specified 6 HP Johnson\/Evinrude application and is built to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003eInstallation is a standard head-gasket swap performed whenever the power head is removed for service, such as during a top-end rebuild or when addressing a compression or coolant leak. Using a properly fitted, correctly specified gasket like the 18-2961 helps ensure a reliable seal and consistent engine performance 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 18-2961\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head 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 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999314604\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Johnson\/Evinrude 6 HP outboard, 1965-79\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e GLM 33830, Johnson\/Evinrude 306204, 329103\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude 6 HP outboard motors, 1965-79\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 33830\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude 306204\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude 329103\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-2961 head gasket fit?\u003c\/strong\u003e The Sierra 18-2961 is designed for Johnson and Evinrude 6 HP outboard motors from 1965-79.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2961 gasket interchangeable with any OEM numbers?\u003c\/strong\u003e Yes, the Sierra 18-2961 is interchangeable with GLM 33830 and Johnson\/Evinrude Outboard numbers 306204 and 329103.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2961 head gasket weigh?\u003c\/strong\u003e The Sierra 18-2961 Head Gasket weighs 0.08 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2961 head gasket?\u003c\/strong\u003e It is white, consistent with the finish Sierra uses for this head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-2961 is a genuine Sierra replacement part, manufactured to meet or exceed the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2961 work on a 6 HP Johnson or Evinrude built after 1979?\u003c\/strong\u003e No, the Sierra 18-2961 is specified for 6 HP Johnson\/Evinrude outboards from 1965-79; later 6 HP models use a different Sierra part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this head gasket be replaced?\u003c\/strong\u003e The 18-2961 should be replaced any time the power head is removed for service on a 6 HP Johnson\/Evinrude, 1965-79, such as during a top-end rebuild or when a compression or coolant leak is present at the head joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the Sierra 18-2961?\u003c\/strong\u003e The product includes one Sierra 18-2961 Head Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2961 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-2961 Head Gasket is covered by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-2961?\u003c\/strong\u003e The Sierra 18-2961 Head Gasket carries UPC 030999314604.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135522523,"sku":"SIE-18-2961","price":17.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2961_lg__59806.1558125501.500.750.jpg?v=1785189034"},{"product_id":"sierra-18-2960-marine-head-gasket-for-johnson-evinrude-50-hp-outboard-1971-1975-replaces-omc-313413","title":"Sierra 18-2960 Head Gasket, Replaces OMC 313413, for Johnson\/Evinrude 50 HP Outboards (1971-1975)","description":"\u003cp\u003eThe Sierra 18-2960 is a head gasket engineered for Johnson and Evinrude 50 HP outboard motors (1971-1975). It seals the mating surface between the cylinder head and powerhead block, maintaining proper compression and preventing coolant or combustion leakage during operation. The gasket features a machined exterior finish for a precise, consistent fit against the block and head surfaces.\u003c\/p\u003e\u003cp\u003eThis gasket is a direct replacement for the original equipment part, and Sierra manufactures it to meet or exceed the specifications of the OEM component it replaces. Each package contains one head gasket, ready to install as part of a powerhead rebuild or top-end service. The 18-2960 measures 5.75 x 1 x 15.5 inches and weighs 0.21 pounds.\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 18-2960\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999314598\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 5.75 x 1 x 15.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.21 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1 gasket per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Johnson\/Evinrude 50 HP outboards (1971-1975)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 313413\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eJohnson 50 HP outboards (1971-1975)\u003c\/li\u003e\n\u003cli\u003eEvinrude 50 HP outboards (1971-1975)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e313413\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2960 head gasket fit?\u003c\/strong\u003e The Sierra 18-2960 is built for Johnson and Evinrude 50 HP outboard motors from 1971 to 1975.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2960 the same as OMC 313413?\u003c\/strong\u003e Yes, Sierra 18-2960 is a direct replacement for the original equipment OMC part number 313413.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The Sierra 18-2960 head gasket weighs 0.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-2960 head gasket?\u003c\/strong\u003e It measures 5.75 x 1 x 15.5 inches, sized to seal the head-to-block mating surface on Johnson\/Evinrude 50 HP powerheads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e Each package of the Sierra 18-2960 contains one head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2960 meet OEM quality standards?\u003c\/strong\u003e Sierra manufactures the 18-2960 head gasket to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-2960 gasket have?\u003c\/strong\u003e The 18-2960 head gasket has a machined exterior finish for a precise seal against the head and block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2960 a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-2960 is a Sierra aftermarket replacement gasket, engineered to meet or exceed the OEM part it replaces rather than being sourced from Johnson\/Evinrude directly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2960 gasket work on other horsepower outboards besides 50 HP?\u003c\/strong\u003e The 18-2960 head gasket is designated for Johnson and Evinrude 50 HP outboards (1971-1975); no other horsepower applications are listed for this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-2960 gasket?\u003c\/strong\u003e The Sierra 18-2960 head gasket carries UPC 030999314598.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2960 head gasket still available from the manufacturer?\u003c\/strong\u003e Yes, the Sierra 18-2960 head gasket has not been discontinued by the manufacturer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat part does the Sierra 18-2960 replace during a powerhead rebuild?\u003c\/strong\u003e During a Johnson\/Evinrude 50 HP powerhead rebuild, the 18-2960 replaces the original head gasket, OEM number 313413.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135555291,"sku":"SIE-18-2960","price":28.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2960_lg__99212.1558125436.500.750.jpg?v=1785189200"},{"product_id":"head-gasket-for-johnson-evinrude-50-hp-outboard-1971-1975-replaces-oem-322332-sierra-18-2962","title":"Sierra 18-2962 Head Gasket for Johnson\/Evinrude 50 HP Outboard, Replaces 306163 and 322332","description":"\u003cp\u003eThe Sierra 18-2962 Head Gasket is a replacement power head gasket built for Johnson and Evinrude 50 HP outboard engines. It seals the cylinder head-to-block joint, maintaining proper compression and preventing coolant or combustion leaks that can lead to lost power, overheating, or head damage. This gasket is a direct equivalent to the original Johnson\/Evinrude 306163 and 322332 gaskets, so it installs using the same mounting pattern and torque specifications as the OEM part it replaces.\u003c\/p\u003e\u003cp\u003eEach package contains one gasket, sold individually for a single head gasket replacement job. Sierra manufactures this gasket to meet or exceed the performance of the original equipment part, making it a reliable choice when servicing a 50 HP Johnson or Evinrude power head during a rebuild, head removal, or leak repair.\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 18-2962\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Power Head 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 0.09 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 gasket per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999314611\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson and Evinrude 50 HP (1971-1975) outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e306163\u003c\/li\u003e\n\u003cli\u003e322332\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2962 head gasket fit?\u003c\/strong\u003e This gasket is built for Johnson and Evinrude 50 HP (1971-1975) outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2962 replace?\u003c\/strong\u003e It is a direct interchange for Johnson\/Evinrude outboard head gaskets 306163 and 322332.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2962 an OEM or aftermarket gasket?\u003c\/strong\u003e It is an aftermarket Sierra-manufactured gasket engineered to meet or exceed the performance of the original 306163 and 322332 Johnson\/Evinrude gaskets it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package of the 18-2962?\u003c\/strong\u003e One head gasket is included per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2962 head gasket weigh?\u003c\/strong\u003e The Sierra 18-2962 head gasket weighs 0.09 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2962 head gasket?\u003c\/strong\u003e It is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2962 work on any Johnson or Evinrude outboard?\u003c\/strong\u003e No, this gasket is specific to Johnson and Evinrude 50 HP (1971-1975) engines and should be matched to that engine before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2962 require any additional gaskets or seals to complete a head gasket job?\u003c\/strong\u003e The listing covers the head gasket itself; check your engine's other seals and hardware separately since only the head gasket is included in this package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2962 be used as a direct swap without modification?\u003c\/strong\u003e Yes, since it is interchangeable with the original 306163 and 322332 gaskets, it installs in place of those parts on a Johnson\/Evinrude 50 HP power head.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between using an OEM Johnson\/Evinrude gasket versus the Sierra 18-2962?\u003c\/strong\u003e The Sierra 18-2962 is manufactured to meet or exceed the specification of the original 306163 and 322332 gaskets, providing the same fit and sealing performance as the OEM part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135784667,"sku":"SIE-18-2962","price":28.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2962_lg__95896.1558125570.500.750.jpg?v=1785188114"},{"product_id":"head-gasket-for-johnson-evinrude-50-hp-outboard-1971-1975-replaces-omc-320745-sierra-18-2964","title":"Sierra 18-2964 Head Gasket for Johnson\/Evinrude 150 HP (1973-91) and 155 HP Commercial (1984-92) Outboards","description":"\u003cp\u003eThe Sierra 18-2964 is a head gasket built for Johnson\/Evinrude outboard power heads, designed to seal the cylinder head against the engine block and maintain proper compression, coolant flow, and combustion sealing. It fits Johnson\/Evinrude 150 HP outboards from 1973-91 as well as the 155 HP Commercial model from 1984-92. Each package contains one gasket, engineered to meet or exceed the sealing performance of the original equipment part it replaces. Because a head gasket sits at a critical sealing point between the cylinder head and block, using a properly sized replacement like the 18-2964 helps prevent compression loss, coolant leakage, and exhaust blow-by that can follow from a worn or damaged factory gasket. This is a direct-fit replacement part rather than a universal or trimmable gasket, so it is matched to the specific power head applications listed below. Boat owners and marine technicians rebuilding or servicing a Johnson\/Evinrude power head on one of these applications can use the 18-2964 as a like-for-like replacement during a head gasket 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 18-2964\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999314635\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Power Head Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Johnson\/Evinrude 150 HP, 1973-91\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Johnson\/Evinrude 155 HP Commercial, 1984-92\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 320745, 335360, 766779, GLM 33870, Mallory 9-63829\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.17 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\u003ePackage Quantity:\u003c\/strong\u003e 1 gasket per package\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eJohnson\/Evinrude 150 HP, 1973-91\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude 155 HP Commercial, 1984-92\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e320745\u003c\/li\u003e\n\u003cli\u003e335360\u003c\/li\u003e\n\u003cli\u003e766779\u003c\/li\u003e\n\u003cli\u003eGLM 33870\u003c\/li\u003e\n\u003cli\u003eMallory 9-63829\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2964 head gasket fit?\u003c\/strong\u003e The 18-2964 is built for Johnson\/Evinrude outboards, specifically the 150 HP model from 1973-91 and the 155 HP Commercial model from 1984-92.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2964 a direct OEM replacement?\u003c\/strong\u003e Yes, it is a direct-fit replacement engineered to meet or exceed the sealing performance of the original head gasket it replaces on the applicable Johnson\/Evinrude power heads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2964 cross-reference to?\u003c\/strong\u003e It cross-references to OEM numbers 320745, 335360, and 766779, as well as GLM 33870 and Mallory 9-63829.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2964 head gasket weigh?\u003c\/strong\u003e It weighs 0.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-2964?\u003c\/strong\u003e The gasket measures 0.39 x 0.39 x 0.39 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package of the 18-2964?\u003c\/strong\u003e One head gasket is included per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2964 fit any Johnson\/Evinrude outboard regardless of horsepower?\u003c\/strong\u003e No, it is specific to the 150 HP (1973-91) and 155 HP Commercial (1984-92) Johnson\/Evinrude power heads listed for this part number, not a universal fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2964 genuine Sierra or a generic aftermarket gasket?\u003c\/strong\u003e It is a genuine Sierra-branded part, part number 18-2964, made to replace the factory head gasket on the specified Johnson\/Evinrude applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2964 be used as a Mallory 9-63829 replacement?\u003c\/strong\u003e Yes, the 18-2964 cross-references directly to Mallory 9-63829 along with the other listed OEM numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should a head gasket like the 18-2964 be replaced?\u003c\/strong\u003e A head gasket should be replaced any time the cylinder head is removed for service, or if it shows signs of compression loss, coolant leakage, or exhaust blow-by, using a matched part like the 18-2964 for the applicable Johnson\/Evinrude engine.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135817435,"sku":"SIE-18-2964","price":33.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2964_lg__77872.1558125692.500.750.jpg?v=1785187988"},{"product_id":"sierra-18-2963-exhaust-cover-gasket-for-johnson-evinrude-50-hp-outboard-1971-1975-replaces-omc-318925","title":"Sierra 18-2963 Head Gasket, Replaces Johnson\/Evinrude 318914, Fits 9.9-14 HP Outboards","description":"\u003cp\u003eThe Sierra 18-2963 is a head gasket engineered for Johnson and Evinrude outboard power heads, sealing the cylinder head to the block to maintain compression and prevent coolant or combustion leaks. This is a critical wear part for any outboard rebuild or top-end service, replacing the factory gasket that degrades with heat cycling over time. The gasket is supplied one per package and is built to meet or exceed the performance of the original equipment part it replaces, giving rebuilders confidence that fit and seal quality will match OEM expectations.\u003c\/p\u003e\u003cp\u003eSierra 18-2963 is designed for Johnson\/Evinrude outboards rated 9.9 HP (1974-92), 10 HP Commercial (1989-90), and 14 HP (1988-90). It is directly interchangeable with GLM 34140 and Johnson\/Evinrude 318914, 320533, and 330818, as well as Mallory 9-63832, so buyers who know any of those cross-reference numbers can confirm this is the correct gasket for their power head. Always match the gasket to your specific HP rating and model year range before ordering to ensure proper cylinder sealing.\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 18-2963\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 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 gasket per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Power Head Gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eJohnson\/Evinrude 9.9 HP, 1974-92\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude 10 HP Commercial, 1989-90\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude 14 HP, 1988-90\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 34140\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude Outboard 318914\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude Outboard 320533\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude Outboard 330818\u003c\/li\u003e\n\u003cli\u003eMallory 9-63832\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat outboards does the Sierra 18-2963 head gasket fit?\u003c\/strong\u003e It fits Johnson\/Evinrude outboards rated 9.9 HP (1974-92), 10 HP Commercial (1989-90), and 14 HP (1988-90).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2963 the same as GLM 34140?\u003c\/strong\u003e Yes, GLM 34140 is a direct cross-reference to the Sierra 18-2963 head gasket, meaning either part number will fit the same Johnson\/Evinrude applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM numbers does 18-2963 replace?\u003c\/strong\u003e Sierra 18-2963 replaces Johnson\/Evinrude Outboard 318914, 320533, and 330818, as well as Mallory 9-63832.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package of 18-2963?\u003c\/strong\u003e One Sierra 18-2963 head gasket is included per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2963 head gasket weigh?\u003c\/strong\u003e The Sierra 18-2963 head gasket weighs 0.06 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2963 gasket?\u003c\/strong\u003e The Sierra 18-2963 head gasket is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-2963 gasket fit a 1985 Johnson\/Evinrude 9.9 HP?\u003c\/strong\u003e Sierra lists the 18-2963 as fitting Johnson\/Evinrude 9.9 HP outboards from 1974 to 1992, so a 1985 model falls within that fitment range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2963 a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-2963 is a Sierra-brand aftermarket head gasket that is built to meet or exceed the performance of the original equipment gasket it replaces, such as Johnson\/Evinrude 318914.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2963 gasket fit the 10 HP Commercial outboard?\u003c\/strong\u003e Yes, Sierra 18-2963 fits the Johnson\/Evinrude 10 HP Commercial outboard for model years 1989-90.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the Sierra 18-2963?\u003c\/strong\u003e Each order includes one Sierra 18-2963 head gasket; no additional hardware or gaskets are included in the package.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988136440027,"sku":"SIE-18-2963","price":13.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2963_lg__19755.1558125635.500.750.jpg?v=1785188247"},{"product_id":"yamaha-outboard-powerhead-gasket-set-head-gasket-o-rings-thermostat-exhaust-cover-gaskets-replaces-688-11181-02-00-6h1-w0001-00-00-sierra-18-3805","title":"Sierra Head Gasket 18-3805, Replaces Yamaha 6H1-W0001-00-00, for Yamaha Outboard Engines","description":"\u003cp\u003eThe Sierra 18-3805 is a head gasket engineered as a direct replacement for Yamaha outboard engines. It seals the mating surface between the cylinder head and the powerhead block, maintaining compression and preventing coolant or combustion leaks at this critical joint. As a precision-fit replacement part, it is built to the same sealing tolerances as the original equipment it replaces, making it a straightforward swap when servicing a Yamaha outboard head gasket that has failed or is being replaced as routine maintenance during a top-end rebuild.\u003c\/p\u003e\u003cp\u003eThis head gasket is cataloged under the Yamaha Outboard Head Gaskets category and cross-references directly to Yamaha OEM part numbers, so it can be ordered with confidence as an equivalent to the factory gasket. It is a lightweight, single-component part designed for straightforward removal and installation using standard outboard service procedures and correct torque specifications.\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 18-3805\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Yamaha Outboard Head Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.21 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999316561\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Yamaha outboard engines; specific model, horsepower, and year fitment should be confirmed against the OEM cross-reference numbers below.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6H1-W0001-00-00\u003c\/li\u003e\n\u003cli\u003e6H1-W0001-01-00\u003c\/li\u003e\n\u003cli\u003e6H1-W0001-A0-00\u003c\/li\u003e\n\u003cli\u003e688-11181-02-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3805 head gasket fit?\u003c\/strong\u003e The Sierra 18-3805 is designed for Yamaha outboard engines and is cataloged as a Yamaha Outboard Head Gasket, cross-referencing directly to Yamaha OEM part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM Yamaha part numbers does 18-3805 replace?\u003c\/strong\u003e Part 18-3805 replaces Yamaha OEM numbers 6H1-W0001-00-00, 6H1-W0001-01-00, 6H1-W0001-A0-00, and 688-11181-02-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3805 a genuine Yamaha part or aftermarket?\u003c\/strong\u003e The 18-3805 is a Sierra-branded replacement gasket, not an OEM Yamaha part, but it is built to match the OEM Yamaha specifications and cross-references directly to the Yamaha part numbers it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3805 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3805 head gasket weighs 0.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3805 head gasket?\u003c\/strong\u003e The UPC for the Sierra 18-3805 head gasket is 030999316561.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere does the 18-3805 gasket install on the engine?\u003c\/strong\u003e It installs between the cylinder head and the powerhead block on a Yamaha outboard, sealing that joint to maintain compression and prevent coolant or combustion leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-3805 gasket for a top-end rebuild?\u003c\/strong\u003e Yes, the Sierra 18-3805 head gasket is suitable for use during a Yamaha outboard top-end rebuild or whenever the head gasket needs replacing due to a failed seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat product category does 18-3805 belong to?\u003c\/strong\u003e Sierra part 18-3805 is listed under the Yamaha Outboard Head Gaskets category.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3805 head gasket come with other gaskets or seals?\u003c\/strong\u003e The 18-3805 is sold as the head gasket itself; it is a single-item part identified by its own Yamaha OEM cross-reference (688-11181-02-00) rather than a multi-piece kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm the 18-3805 is correct for my Yamaha outboard?\u003c\/strong\u003e Match the OEM number stamped or listed for your Yamaha outboard against the cross-references for 18-3805: 6H1-W0001-00-00, 6H1-W0001-01-00, 6H1-W0001-A0-00, or 688-11181-02-00.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988165898459,"sku":"SIE-18-3805","price":43.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3805_lg__66508.1558125561.500.750.jpg?v=1785329163"},{"product_id":"sierra-18-3831-head-gasket-for-yamaha-60-70-hp-outboards-replaces-oem-6h3-11181-01-00","title":"Sierra 18-3831 Head Gasket for Yamaha 60 HP and 70 HP Outboards, Replaces 6H3-11181-01-00","description":"\u003cp\u003eThe Sierra 18-3831 Head Gasket is a replacement head gasket engineered for Yamaha outboard motors, sealing the cylinder head to the block to maintain proper compression and prevent leaks between the combustion chamber and cooling passages. It fits Yamaha 60 (2001-05), P60 (1991-99), C60 (1996-01), E60 (1995-00), C70 (2000-01), and 70 (1984-09) engines, making it a direct fit for owners servicing these specific Yamaha outboard model years. Each package includes one gasket, sized precisely to match the original equipment sealing surface for a proper seal on installation.\u003c\/p\u003e\u003cp\u003eThis gasket is built to meet or exceed the specifications of the original equipment part it replaces, giving boat owners and marine technicians a reliable option when rebuilding a powerhead or addressing a compression or coolant leak. It cross-references directly to several OEM and aftermarket part numbers, so it can be ordered as a straightforward equivalent to the factory Yamaha gasket during a head gasket replacement or top-end 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 18-3831\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Yamaha Outboard Head Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.19 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 030999316820\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e One gasket per package\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYamaha 60 HP (2001-05)\u003c\/li\u003e\n\u003cli\u003eYamaha P60 HP (1991-99)\u003c\/li\u003e\n\u003cli\u003eYamaha C60 HP (1996-01)\u003c\/li\u003e\n\u003cli\u003eYamaha E60 HP (1995-00)\u003c\/li\u003e\n\u003cli\u003eYamaha C70 HP (2000-01)\u003c\/li\u003e\n\u003cli\u003eYamaha 70 HP (1984-09)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 34940\u003c\/li\u003e\n\u003cli\u003eMallory 9-63952\u003c\/li\u003e\n\u003cli\u003eYamaha 6H3-11181-00-00\u003c\/li\u003e\n\u003cli\u003eYamaha 6H3-11181-01-00\u003c\/li\u003e\n\u003cli\u003eYamaha 6H3-11181-A0-00\u003c\/li\u003e\n\u003cli\u003eYamaha 6H3-11181-A1-00\u003c\/li\u003e\n\u003cli\u003eYamaha 6H3-11181-A2-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3831 head gasket fit?\u003c\/strong\u003e The Sierra 18-3831 fits Yamaha 60 HP (2001-05), P60 (1991-99), C60 (1996-01), E60 (1995-00), C70 (2000-01), and 70 (1984-09) outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this gasket replace?\u003c\/strong\u003e It replaces Yamaha 6H3-11181-00-00, 6H3-11181-01-00, 6H3-11181-A0-00, 6H3-11181-A1-00, and 6H3-11181-A2-00, and is also interchangeable with GLM 34940 and Mallory 9-63952.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e One Sierra 18-3831 head gasket is included per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3831 an OEM or aftermarket part?\u003c\/strong\u003e It is an aftermarket Sierra-brand head gasket built to meet or exceed the specifications of the original Yamaha equipment it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this head gasket?\u003c\/strong\u003e The Sierra 18-3831 measures 0.39 x 0.39 x 0.39 inches and weighs 0.19 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket work on a Yamaha P60 outboard?\u003c\/strong\u003e Yes, the Sierra 18-3831 is designed to fit the Yamaha P60 (1991-99) engine along with the 60, C60, E60, C70, and 70 models listed for this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this head gasket?\u003c\/strong\u003e A head gasket like the Sierra 18-3831 typically needs replacement when a powerhead is rebuilt or when symptoms of a blown gasket appear, such as compression loss or coolant leaking into the cylinder.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3831 cross-reference to a Mallory part number?\u003c\/strong\u003e Yes, Mallory 9-63952 is a direct cross-reference to the Sierra 18-3831 head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket compatible with the Yamaha 70 HP outboard?\u003c\/strong\u003e The Yamaha 70 (1984-09) outboard is one of the engines this Sierra 18-3831 head gasket is designed to fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3831 head gasket?\u003c\/strong\u003e The UPC for the Sierra 18-3831 head gasket is 030999316820.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988165931227,"sku":"SIE-18-3831","price":38.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3831_lg__99697.1558126770.500.750.jpg?v=1785188132"},{"product_id":"sierra-18-3802-powerhead-mounting-twin-gasket-for-johnson-evinrude-outboards-replaces-omc-326468-351018","title":"Sierra 18-3802 Head Gasket for Johnson\/Evinrude 40 HP and 45 HP Outboard Motors","description":"\u003cp\u003eThe Sierra 18-3802 is a marine head gasket built for Johnson\/Evinrude outboard motors, sold as a direct-fit replacement for the original equipment gasket on the power head. It seals the joint between the cylinder head and the engine block, maintaining proper compression and preventing coolant or combustion leaks that can lead to overheating or power loss. The gasket is engineered to meet or exceed original equipment quality, making it a reliable choice for a power head rebuild or a routine gasket replacement.\u003c\/p\u003e\u003cp\u003eThe 18-3802 is finished in white and is fit-specific to the outboard models it covers, so buyers should confirm their engine's horsepower rating and model year before ordering. It is designed as a drop-in match for the factory gasket location, requiring no modification to install. Because head gaskets are wear items exposed to heat cycling and combustion pressure, replacing this gasket during a top-end service helps restore proper sealing and compression on applicable Johnson\/Evinrude power heads.\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 18-3802\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Power Head 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 0.13 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999316530\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eJohnson\/Evinrude 40 HP outboard, 1984-97\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude 40 HP Commercial outboard, 1994-97\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude 45 HP Commercial outboard, 1985-97\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e335359\u003c\/li\u003e\n\u003cli\u003e327795\u003c\/li\u003e\n\u003cli\u003e320658\u003c\/li\u003e\n\u003cli\u003eGLM 34250\u003c\/li\u003e\n\u003cli\u003eMallory 9-63833\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3802 head gasket used for?\u003c\/strong\u003e The Sierra 18-3802 seals the joint between the cylinder head and the power head block on Johnson\/Evinrude outboard motors, maintaining compression and preventing coolant or combustion leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Johnson\/Evinrude outboards fit the 18-3802 head gasket?\u003c\/strong\u003e The 18-3802 fits the Johnson\/Evinrude 40 HP outboard (1984-97), the 40 HP Commercial outboard (1994-97), and the 45 HP Commercial outboard (1985-97).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3802 gasket a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-3802 is a Sierra-brand replacement gasket manufactured to meet or exceed original equipment quality; it is not an OEM Johnson\/Evinrude branded part but is built as a direct equivalent.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-3802 replace?\u003c\/strong\u003e The Sierra 18-3802 head gasket cross-references to OEM and interchange numbers 335359, 327795, and 320658, as well as GLM 34250 and Mallory 9-63833.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3802 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3802 head gasket weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-3802 head gasket?\u003c\/strong\u003e This head gasket is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3802 fit a Johnson\/Evinrude engine outside the listed HP and years?\u003c\/strong\u003e The 18-3802 is fit-specific to the Johnson\/Evinrude 40 HP (1984-97), 40 HP Commercial (1994-97), and 45 HP Commercial (1985-97) outboards; buyers should check their engine's HP and model year against these listings before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need to replace my head gasket?\u003c\/strong\u003e Signs that a power head gasket like the 18-3802 needs replacement include coolant leaks at the cylinder head joint, loss of compression, or overheating on the applicable Johnson\/Evinrude outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-3802 gasket straightforward?\u003c\/strong\u003e The 18-3802 is a direct-fit replacement gasket for the factory location on covered Johnson\/Evinrude power heads, requiring no modification to install during a head or top-end service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3802 head gasket?\u003c\/strong\u003e The UPC for the Sierra 18-3802 head gasket is 030999316530.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988165963995,"sku":"SIE-18-3802","price":30.41,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3802_lg__20816.1558125375.500.750.jpg?v=1785187990"},{"product_id":"sierra-18-3836-head-gasket-for-johnson-evinrude-outboards-replaces-oem-329836","title":"Sierra 18-3836 Head Gasket for Johnson\/Evinrude 65 HP Commercial Outboards, 1987-95","description":"\u003cp\u003eThe Sierra 18-3836 head gasket is a replacement power head gasket engineered for Johnson and Evinrude outboard applications, specifically the 65 HP Commercial model built 1987-95. This gasket forms the critical seal between the cylinder block and cylinder head, preventing compression loss and coolant or combustion leaks that can lead to overheating or power head failure. It is manufactured from glass gasket material with a white finish, chosen for its ability to withstand the repeated heat cycling and vibration of marine two-stroke outboard operation while maintaining a durable, long-lasting seal.\u003c\/p\u003e\u003cp\u003eEach package includes one gasket, sized and shaped specifically for the 65 HP Commercial power head, so no trimming or modification is required during installation. Sierra engineers this gasket to meet or exceed the performance of the original equipment part it replaces, making it a reliable choice when rebuilding or servicing the power head. It is designed as a direct fit for the listed application and is cross-referenced to common OEM and aftermarket part numbers for easy identification when 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 18-3836\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Glass\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 0.17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1 gasket per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999316875\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude 65 HP Commercial outboards, 1987-95\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 34280\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude Outboard 329836\u003c\/li\u003e\n\u003cli\u003eMallory 9-63821\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat outboards does the Sierra 18-3836 head gasket fit?\u003c\/strong\u003e The 18-3836 is designed for Johnson\/Evinrude 65 HP Commercial outboards built 1987-95.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3836 an OEM head gasket or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra aftermarket head gasket engineered to meet or exceed the performance of the original equipment part it replaces on the 65 HP Commercial Johnson\/Evinrude power head.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-3836 cross-reference?\u003c\/strong\u003e This gasket is interchangeable with GLM 34280, Johnson\/Evinrude Outboard 329836, and Mallory 9-63821.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e Each package of the 18-3836 contains one head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-3836 head gasket made from?\u003c\/strong\u003e It is made from glass gasket material with a white finish, chosen for durability under the heat and vibration of outboard operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the Sierra 18-3836 gasket?\u003c\/strong\u003e The 18-3836 is a round head gasket sized specifically for the 65 HP Commercial Johnson\/Evinrude power head.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3836 head gasket weigh?\u003c\/strong\u003e The 18-3836 weighs 0.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to modify or trim the 18-3836 before installing it?\u003c\/strong\u003e No, the 18-3836 is sized to fit the 65 HP Commercial power head directly, so no trimming or modification is needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3836 fit a 65 Jet model Johnson\/Evinrude outboard?\u003c\/strong\u003e No, the 18-3836 is specified for the 65 HP Commercial application; the 65 Jet application uses a different Sierra part number, so confirm your engine model before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this gasket seal?\u003c\/strong\u003e The 18-3836 seals the joint between the cylinder block and cylinder head on the power head, preventing compression, coolant, or combustion leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3836?\u003c\/strong\u003e The UPC for the Sierra 18-3836 head gasket is 030999316875.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988165996763,"sku":"SIE-18-3836","price":31.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3836_lg__94068.1558126982.500.750.jpg?v=1785188915"},{"product_id":"head-gasket-for-evinrude-johnson-2-cylinder-outboards-replaces-oem-203130-sierra-18-3841-2","title":"Sierra Head Gasket 18-3841-2, Replaces GLM 34010, Evinrude\/Johnson 203130","description":"\u003cp\u003eThe Sierra 18-3841-2 Head Gasket is a replacement head gasket engineered to meet or exceed the quality of the original equipment part it replaces. It seals the mating surface between the cylinder head and the powerhead block, maintaining proper compression and preventing coolant or combustion leakage on applicable outboard engines. Each unit ships as a single gasket, ready to install during a head gasket replacement, top-end rebuild, or routine maintenance service.\u003c\/p\u003e\u003cp\u003eThis gasket is built to Sierra's quality standard for marine engine components, giving boat owners and marine technicians a dependable alternative to sourcing the original manufacturer part. It is designed as a direct equivalent, cross-referencing to GLM 34010 and Evinrude\/Johnson 203130, so it fits in place of those OEM and aftermarket numbers 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 18-3841-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 Count\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282194031\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCross-references to GLM 34010\u003c\/li\u003e\n\u003cli\u003eCross-references to Evinrude\/Johnson 203130\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 34010\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 203130\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3841-2 Head Gasket fit?\u003c\/strong\u003e The Sierra 18-3841-2 Head Gasket cross-references to GLM 34010 and Evinrude\/Johnson 203130, so it is a direct equivalent for applications calling for either of those part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3841-2 the same as GLM 34010?\u003c\/strong\u003e Yes, GLM 34010 is a listed cross-reference for the Sierra 18-3841-2 Head Gasket, meaning the two part numbers are equivalent for fitment purposes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-3841-2 replace Evinrude\/Johnson 203130?\u003c\/strong\u003e Yes, Evinrude\/Johnson 203130 is one of the OEM numbers that the Sierra 18-3841-2 Head Gasket replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one order of part 18-3841-2?\u003c\/strong\u003e One order includes a single Head Gasket, listed as a unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3841-2 Head Gasket weigh?\u003c\/strong\u003e It weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3841-2 an OEM part or aftermarket?\u003c\/strong\u003e The 18-3841-2 is a Sierra-brand replacement gasket built to meet or exceed the quality of 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 18-3841-2?\u003c\/strong\u003e The order includes one Sierra Head Gasket, part number 18-3841-2, with no additional hardware or components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-3841-2 gasket for a head gasket replacement job?\u003c\/strong\u003e Yes, the Sierra 18-3841-2 is designed as a head gasket replacement part, sealing the cylinder head to the powerhead during a gasket swap or top-end service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3841-2 Head Gasket?\u003c\/strong\u003e The UPC for this Sierra Head Gasket is 808282194031.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-3841-2 work if my parts book lists 203130 instead?\u003c\/strong\u003e Yes, 203130 (Evinrude\/Johnson) is a direct cross-reference to the Sierra 18-3841-2 Head Gasket, so it will fit the same application.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988166029531,"sku":"SIE-18-3841-2","price":7.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3841-2_lg__62949.1558127213.500.750.jpg?v=1785188081"},{"product_id":"sierra-18-3803-head-gasket-for-omc-johnson-evinrude-2-cylinder-outboards-replaces-oem-329419-765012","title":"Sierra Head Gasket 18-3803, Replaces OMC 329419, for 2-Cylinder Outboard Engines","description":"\u003cp\u003eThe Sierra 18-3803 Head Gasket is a replacement gasket designed to seal the cylinder head on 2-cylinder outboard engines. It is built to the OEM cross-reference OMC 329419, making it a direct fit for the power head applications that number covers. The gasket has a round shape and a white finish, and is sized to seat correctly between the cylinder head and the power head to maintain proper compression and prevent coolant or combustion leaks at the head joint.\u003c\/p\u003e\u003cp\u003eThis part is intended for service and rebuild work on 2-cylinder outboard power heads, where the head gasket is a wear item that should be replaced any time the cylinder head is removed for inspection, decarbonizing, or repair. Using the correct gasket for the specific engine helps ensure a proper seal and avoids the compression loss, coolant leaks, or blown-gasket failures that come from reusing an old gasket or fitting an incorrect one.\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 18-3803\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Head 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 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999316547\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e 2-cylinder outboard models\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e OMC 329419\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e2-cylinder outboard power head models only\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 329419\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3803 head gasket fit?\u003c\/strong\u003e The Sierra 18-3803 head gasket is for 2-cylinder outboard models only, sealing the cylinder head to the power head on those engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-3803 replace?\u003c\/strong\u003e It replaces OMC 329419, so any engine calling for that OEM number can use the Sierra 18-3803 instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-3803 head gasket?\u003c\/strong\u003e It is white and round in shape, matching the factory head gasket profile it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3803 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3803 head gasket weighs 0.1 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3803 an OEM-equivalent part?\u003c\/strong\u003e Yes, it is manufactured to match OMC 329419 as a direct cross-reference replacement for that OEM head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket work on a 4-cylinder or V-engine outboard?\u003c\/strong\u003e No, the 18-3803 head gasket is designated for 2-cylinder models only and should not be used on 4-cylinder or V-configuration outboard power heads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace this head gasket?\u003c\/strong\u003e The 18-3803 head gasket should be replaced any time the cylinder head is removed from a 2-cylinder outboard power head for service, since the old gasket should not be reused.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the Sierra 18-3803?\u003c\/strong\u003e You receive one Sierra 18-3803 head gasket, sized for a 2-cylinder outboard power head.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3803 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-3803 head gasket carries a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3803 gasket round or another shape?\u003c\/strong\u003e It is a round gasket, matching the cylinder head bolt pattern and bore layout of the 2-cylinder power heads it fits.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988166062299,"sku":"SIE-18-3803","price":23.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3803_lg__04934.1558125438.500.750.jpg?v=1785188226"},{"product_id":"head-gasket-for-yamaha-outboard-replaces-oem-6l2-11181-a1-00-sierra-18-3847","title":"Sierra Head Gasket 18-3847, Replaces 6L2-11181-A1-00 for Yamaha Outboard Engines","description":"\u003cp\u003eThe Sierra 18-3847 is a head gasket engineered as a direct replacement for Yamaha outboard engines. It seals the cylinder head-to-block joint, maintaining proper compression and preventing coolant or combustion leaks between the head and the powerhead. Each unit is supplied as a single head gasket (quantity of 1) and is manufactured to match the original equipment specification identified by Yamaha part number 6L2-11181-A1-00.\u003c\/p\u003e\u003cp\u003eThis head gasket is designed for outboard owners and marine technicians performing a cylinder head removal, powerhead rebuild, or routine maintenance where the head gasket must be replaced to restore a proper seal. Installing a correctly specified head gasket such as the Sierra 18-3847 helps ensure consistent cylinder sealing and compression across the powerhead.\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 18-3847\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Yamaha Outboard Head Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.13 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e 6L2-11181-A1-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eYamaha outboard engines.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6L2-W0001-01-00\u003c\/li\u003e\n\u003cli\u003e6L2-W0001-02-00\u003c\/li\u003e\n\u003cli\u003e6L2-W0001-A2-00\u003c\/li\u003e\n\u003cli\u003e6L2-11181-A1-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3847?\u003c\/strong\u003e It is a head gasket, sold as Sierra part number 18-3847, designed to seal the cylinder head-to-block joint on Yamaha outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Yamaha OEM part numbers does the 18-3847 replace?\u003c\/strong\u003e The Sierra 18-3847 replaces Yamaha OEM numbers 6L2-W0001-01-00, 6L2-W0001-02-00, 6L2-W0001-A2-00, and 6L2-11181-A1-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one 18-3847 package?\u003c\/strong\u003e Each Sierra 18-3847 package contains a quantity of 1 head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the 18-3847 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3847 head gasket weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3847 a genuine Yamaha part or an aftermarket replacement?\u003c\/strong\u003e The 18-3847 is a Sierra-branded aftermarket head gasket manufactured to replace the Yamaha OEM head gasket 6L2-11181-A1-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-3847 head gasket fit?\u003c\/strong\u003e The Sierra 18-3847 is listed for Yamaha outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace the 18-3847 head gasket?\u003c\/strong\u003e This head gasket should be replaced any time the cylinder head is removed for service, or if there is a compression or coolant leak at the head-to-block joint, on the applicable Yamaha outboard engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3847 come with installation instructions or additional gaskets?\u003c\/strong\u003e The Sierra 18-3847 package includes only the head gasket itself, in a quantity of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3847 head gasket round or a specific shape?\u003c\/strong\u003e The Sierra 18-3847 head gasket is round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I cross-reference the 18-3847 by its Yamaha OEM number?\u003c\/strong\u003e Yes, the Sierra 18-3847 cross-references to Yamaha OEM numbers 6L2-W0001-01-00, 6L2-W0001-02-00, 6L2-W0001-A2-00, and 6L2-11181-A1-00.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988166160603,"sku":"SIE-18-3847","price":28.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3847_lg__32295.1558127496.500.750.jpg?v=1785189053"},{"product_id":"head-gasket-for-nissan-tohatsu-40-50-hp-outboard-replaces-oem-3c8010055m-sierra-18-3850","title":"Sierra Head Gasket 18-3850 for Tohatsu Outboard Internal Engine","description":"\u003cp\u003eThe Sierra 18-3850 Head Gasket is a replacement internal engine component designed for Tohatsu outboard engines. It seals the mating surface between the cylinder head and engine block, maintaining proper compression and preventing coolant or combustion leaks that can lead to overheating or power loss. As part of Sierra's internal engine parts line, this head gasket is built to restore a factory-correct seal during a head gasket replacement or full engine rebuild.\u003c\/p\u003e\u003cp\u003eEach unit ships as a single head gasket (1 item per package), identified by Sierra part number 18-3850 and UPC 808282339449. It is intended for technicians and boat owners servicing Tohatsu outboard powerheads who need a properly fitted gasket rather than a generic cut sheet gasket, helping ensure an accurate seal against the cylinder head bolt pattern and coolant\/combustion passages.\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 18-3850\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Tohatsu Outboard Internal Engine Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282339449\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.27 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eTohatsu outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3850 head gasket used for?\u003c\/strong\u003e It seals the joint between the cylinder head and engine block on a Tohatsu outboard engine, maintaining compression and preventing coolant or combustion leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3850 head gasket fit Tohatsu outboards?\u003c\/strong\u003e Yes, the Sierra 18-3850 is categorized as a Tohatsu outboard internal engine part and is designed as a head gasket replacement for these engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets are included with part number 18-3850?\u003c\/strong\u003e One head gasket is included per package of Sierra 18-3850.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3850 head gasket?\u003c\/strong\u003e The UPC for this Sierra head gasket is 808282339449.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3850 head gasket weigh?\u003c\/strong\u003e This head gasket weighs 0.27 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3850 an OEM or aftermarket gasket?\u003c\/strong\u003e Sierra 18-3850 is a Sierra-branded replacement head gasket manufactured for servicing Tohatsu outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this head gasket?\u003c\/strong\u003e A head gasket like the Sierra 18-3850 is typically replaced when a Tohatsu outboard shows signs of a blown gasket, such as compression loss, coolant leakage, or overheating, or during a full cylinder head or powerhead rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat part number should I order for this Tohatsu head gasket?\u003c\/strong\u003e Order Sierra part number 18-3850 for this Tohatsu outboard head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-3850 head gasket a DIY job?\u003c\/strong\u003e Installing a head gasket involves removing the cylinder head, so it is generally handled by someone comfortable with outboard engine teardown or a marine technician; the Sierra 18-3850 provides the correctly sized gasket for the job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3850 come with any additional components?\u003c\/strong\u003e No, the package includes only the head gasket itself as the included component.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988166226139,"sku":"SIE-18-3850","price":46.92,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3850__13306.1558185005.500.750.jpg?v=1785188482"},{"product_id":"head-gasket-for-chrysler-force-45-50-hp-outboard-replaces-oem-27-f691529-1-sierra-18-3853","title":"Sierra 18-3853 Head Gasket, Replaces Chrysler 27-F691529-1, for Chrysler\/Force 40 HP \u0026 50 HP Outboards","description":"\u003cp\u003eThe Sierra 18-3853 Head Gasket is a replacement head gasket built for Chrysler\/Force outboard motors, engineered to meet or exceed the quality of the original equipment part it replaces. Its primary use is sealing the cylinder head to the engine block, maintaining compression and preventing leaks between the combustion chamber and the cooling passages. This gasket is finished in white and is supplied as a single unit, making it a straightforward, direct-fit replacement for a worn or damaged factory gasket during a head gasket service or top-end rebuild.\u003c\/p\u003e\u003cp\u003eThis part is designed for Chrysler\/Force 40 HP outboards covering model year 1992C and 1992-99 with serial number E000001 and up, as well as 50 HP outboards covering model years 1990A, 1989-92, B, C, D, and Z. It is interchangeable with Chrysler part number 27-F691529-1 and Mallory part number 9-63805, so it can be used as a direct cross-reference replacement for either of those numbers. At 0.08 pounds, it is a lightweight, low-profile gasket sized specifically for these outboard applications.\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 18-3853\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Outboard Head 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 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 (sold individually)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 707390466071\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e Chrysler 27-F691529-1, Mallory 9-63805\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eChrysler\/Force 40 HP outboards, model year 1992C and 1992-99, serial number E000001 and up\u003c\/li\u003e\n\u003cli\u003eChrysler\/Force 50 HP outboards, model years 1990A, 1989-92, B, C, D, Z\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eChrysler 27-F691529-1\u003c\/li\u003e\n\u003cli\u003eMallory 9-63805\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3853 head gasket fit?\u003c\/strong\u003e This gasket fits Chrysler\/Force 40 HP outboards from model year 1992C and 1992-99 with serial number E000001 and up, and 50 HP outboards from model years 1990A, 1989-92, B, C, D, and Z.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3853 head gasket the same as the Chrysler 27-F691529-1 gasket?\u003c\/strong\u003e Yes, Sierra 18-3853 is interchangeable with Chrysler part number 27-F691529-1, so it can be installed as a direct replacement for that OEM number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket cross-reference to a Mallory part number?\u003c\/strong\u003e Yes, the 18-3853 head gasket is also interchangeable with Mallory part number 9-63805.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3853 head gasket weigh?\u003c\/strong\u003e It weighs 0.08 pounds, consistent with a single-layer gasket sized for a small outboard cylinder head.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-3853 head gasket?\u003c\/strong\u003e It is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the package?\u003c\/strong\u003e The 18-3853 is sold as a single head gasket, one unit per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3853 an OEM or aftermarket part?\u003c\/strong\u003e It is an aftermarket Sierra replacement part built to meet or exceed the quality of the original Chrysler\/Force equipment it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3853 head gasket work on a 1985 50 HP Chrysler outboard?\u003c\/strong\u003e The 18-3853 covers 50 HP model years 1990A and 1989-92, B, C, D, Z; earlier 50 HP model years use a different Sierra part number, so check your engine's model year and serial number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-3853 be used on a 90 HP Chrysler\/Force outboard?\u003c\/strong\u003e No, the 18-3853 is designated for 40 HP and 50 HP Chrysler\/Force outboards only; other horsepower ratings use different Sierra head gasket part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-3853?\u003c\/strong\u003e Each order includes one Sierra 18-3853 head gasket, ready to install between the cylinder head and engine block.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988168257755,"sku":"SIE-18-3853","price":35.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3853_lg__31072.1675867458.500.750.jpg?v=1785188172"},{"product_id":"sierra-18-3857-head-gasket-for-chrysler-force-outboard-100-140-hp-replaces-27-824615-f476529","title":"Sierra Head Gasket 18-3857, Replaces 27-824615, for Chrysler\/Force 100-140 HP Outboards, Pack of 2","description":"\u003cp\u003eThe Sierra 18-3857 Head Gasket is a direct-fit replacement gasket engineered for Chrysler\/Force outboard engines rated 100 thru 140 H.P. It is designed to restore a proper combustion seal between the cylinder head and engine block, preventing compression loss, coolant intrusion, and exhaust gas leakage that can result from a worn or failed factory gasket. Sierra builds this gasket to meet or exceed the specification of the original equipment part it replaces, using materials suited to withstand the heat cycling, pressure, and harsh marine environment outboard engines operate in. Each gasket is finished in white and sold as a package of 2, giving the installer the correct quantity on hand for a complete head gasket job without ordering twice. This part is intended for outboard engine rebuilds, head removal service, and repairs where the head gasket is being replaced as a matter of course due to age, overheating, or a failed seal. Because it carries the same cross-reference numbers as several original Chrysler\/Force part numbers, it is a straightforward swap for technicians and DIY boaters working from OEM parts diagrams or service manuals that list those 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 18-3857\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\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 Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Outboard - Chrysler\/Force\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower Range:\u003c\/strong\u003e 100 thru 140 H.P.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eChrysler\/Force outboard engines, 100 thru 140 H.P.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-824615\u003c\/li\u003e\n\u003cli\u003e27-824615-2\u003c\/li\u003e\n\u003cli\u003eF476529\u003c\/li\u003e\n\u003cli\u003eF476529-1\u003c\/li\u003e\n\u003cli\u003eF476529-2\u003c\/li\u003e\n\u003cli\u003e27-F476529-4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is the Sierra 18-3857 head gasket designed for?\u003c\/strong\u003e The 18-3857 head gasket is built for Chrysler\/Force outboard engines rated 100 thru 140 H.P.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e The 18-3857 is sold as a package of 2 head gaskets, enough for a single head gasket replacement job on most applications it covers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this gasket replace?\u003c\/strong\u003e It replaces OEM numbers 27-824615, 27-824615-2, F476529, F476529-1, F476529-2, and 27-F476529-4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine OEM gasket or an aftermarket part?\u003c\/strong\u003e The 18-3857 is a Sierra-manufactured aftermarket gasket built to meet or exceed the original equipment part it replaces, not a Chrysler\/Force branded OEM gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-3857 head gasket?\u003c\/strong\u003e This head gasket is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3857 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3857 head gasket weighs 0.3 pounds per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket fit a Force 125 HP outboard?\u003c\/strong\u003e Yes, the 18-3857 head gasket is designed for the 100 thru 140 H.P. Range of Chrysler\/Force outboards, which covers a 125 HP application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3857 come with installation hardware or bolts?\u003c\/strong\u003e The 18-3857 package includes 2 head gaskets only; no bolts or additional hardware are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the head gasket on my Chrysler\/Force outboard?\u003c\/strong\u003e A head gasket like the 18-3857 typically needs replacement after overheating, a compression loss, coolant leakage, or any time the cylinder head is removed for service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I order just one 18-3857 gasket instead of the pack of 2?\u003c\/strong\u003e The 18-3857 is sold only as a package of 2 gaskets, matching how it is packaged for Chrysler\/Force 100 thru 140 H.P. Outboard applications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988168487131,"sku":"SIE-18-3857","price":46.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3857_lg__98920.1558128030.500.750.jpg?v=1785189129"},{"product_id":"sierra-18-3862-head-gasket-for-mercury-outboard-replaces-oem-27-41246-1","title":"Sierra 18-3862 Head Gasket, Replaces Mercury Marine 27-41246-1","description":"\u003cp\u003eThe Sierra 18-3862 Head Gasket is a replacement head gasket engineered for Mercury outboard engines, designed to seal the cylinder head against the engine block and maintain proper compression and cooling passage integrity. As a Sierra part, it is built to meet or exceed the quality of the original equipment part it replaces, giving outboard owners a dependable option when servicing or rebuilding a powerhead. The gasket is finished in white and is supplied as a single unit for installation during head removal, cylinder work, or general engine maintenance.\u003c\/p\u003e\u003cp\u003eThis head gasket is intended for use where the original Mercury Marine 27-41246-1 head gasket was fitted, and it is cataloged under Sierra's Mercury Outboard Head Gaskets line. Installers should replace the head gasket any time the cylinder head is removed, since gaskets are single-use components that will not reseal properly if reinstalled. Keeping the correct gasket on hand ensures a proper seal is restored and helps prevent compression loss, coolant leaks, or exhaust leaks 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 18-3862\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\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 030999753700\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Head Gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Mercury outboard applications originally equipped with the Mercury Marine 27-41246-1 head gasket.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-41246-1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3862 Head Gasket fit?\u003c\/strong\u003e The Sierra 18-3862 Head Gasket is designed for Mercury outboard engines that originally used the Mercury Marine 27-41246-1 head gasket, and it is listed under Sierra's Mercury Outboard Head Gaskets category.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3862 the same as Mercury Marine 27-41246-1?\u003c\/strong\u003e Yes, the Sierra 18-3862 Head Gasket is a direct replacement for Mercury Marine part number 27-41246-1 and is built to meet or exceed the quality of that original equipment gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3862 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3862 Head Gasket weighs 0.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e One Sierra 18-3862 Head Gasket is included per unit, sold as a single gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-3862 Head Gasket?\u003c\/strong\u003e This head gasket has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse my old head gasket instead of buying the 18-3862?\u003c\/strong\u003e No, head gaskets such as the Sierra 18-3862 are single-use seals and should be replaced with a new gasket any time the cylinder head is removed to ensure a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3862 genuine OEM or aftermarket?\u003c\/strong\u003e The Sierra 18-3862 Head Gasket is a Sierra-manufactured replacement part, made to meet or exceed the quality of the original Mercury Marine 27-41246-1 equipment gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3862 Head Gasket?\u003c\/strong\u003e The UPC for the Sierra 18-3862 Head Gasket is 030999753700.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the 18-3862 head gasket be replaced?\u003c\/strong\u003e The Sierra 18-3862 Head Gasket should be installed new any time the cylinder head is removed from the Mercury outboard powerhead for service or rebuilding.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category does the 18-3862 gasket belong to?\u003c\/strong\u003e Sierra part 18-3862 is cataloged in the Mercury Outboard Head Gaskets category.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988168585435,"sku":"SIE-18-3862","price":35.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3862_lg__37119.1558125357.500.750.jpg?v=1785188149"},{"product_id":"sierra-18-3863-head-gasket-for-mercury-mariner-135-150-hp-outboards-replaces-oem-27-96542-1","title":"Sierra 18-3863 Head Gasket for Mercury 150 MAR V-6 Outboard Motors","description":"\u003cp\u003eThe Sierra 18-3863 is a round head gasket built for Mercury 150 MAR V-6 outboard motors, specifically the production run covering serial numbers 6038681 through C239553. As a critical seal between the cylinder head and powerhead block, the head gasket prevents the loss of compression and keeps combustion gases, fuel, and coolant properly contained within their intended passages. A worn, cracked, or improperly seated head gasket can lead to compression loss, overheating, or coolant intrusion into the cylinders, making this a key maintenance and rebuild component for outboard owners performing a top-end service or full powerhead rebuild.\u003c\/p\u003e\u003cp\u003eSierra manufactures this gasket to meet or exceed the specifications of the original equipment part it replaces, and it is engineered to hold up to the demands of high-horsepower marine engines operating in a harsh saltwater or freshwater environment. The gasket ships as a single round unit finished in white and is intended as a direct fit for the specific Mercury 150 MAR V-6 serial number range noted above, so confirming your engine's serial number against that range before ordering is recommended. Every Sierra part carries the backing of Sierra's customer satisfaction warranty program.\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 18-3863\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Mercury Outboard Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury 150 MAR V-6 outboard, serial numbers 6038681 to C239553\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Configuration:\u003c\/strong\u003e V-6\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\u003eUPC:\u003c\/strong\u003e 030999753717\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 0.18 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury 150 MAR, V-6, serial numbers 6038681 to C239553\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-3863 head gasket fit?\u003c\/strong\u003e The 18-3863 is designed for Mercury 150 MAR V-6 outboard motors within the serial number range 6038681 to C239553. Checking your outboard's serial number against that range confirms this is the correct gasket for your engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my serial number is in range for the 18-3863 gasket?\u003c\/strong\u003e Your Mercury 150 MAR outboard's serial number needs to fall between 6038681 and C239553 for the 18-3863 head gasket to be the correct fit; engines outside that range use a different Sierra head gasket part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape and color is this head gasket?\u003c\/strong\u003e The Sierra 18-3863 is a round head gasket finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3863 head gasket weigh?\u003c\/strong\u003e It weighs 0.18 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3863 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-3863 is a Sierra-manufactured replacement gasket engineered to meet or exceed the specifications of the original equipment part it replaces, rather than a part sourced directly from Mercury.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the package?\u003c\/strong\u003e One Sierra 18-3863 head gasket ships per unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3863 come with a warranty?\u003c\/strong\u003e Yes, the 18-3863 head gasket is covered under Sierra's customer satisfaction warranty program, as are all Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a head gasket used for on a Mercury outboard?\u003c\/strong\u003e On a Mercury 150 MAR V-6, the head gasket seals the junction between the cylinder head and the powerhead block, containing compression and preventing combustion gases, fuel, or coolant from leaking between passages.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are signs I need to replace the 18-3863 head gasket?\u003c\/strong\u003e Loss of engine compression, overheating, or coolant finding its way into the cylinders on a Mercury 150 MAR V-6 are typical indicators that the head gasket, such as the Sierra 18-3863, needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-3863 gasket on a Mercury 150 MAR outside the listed serial range?\u003c\/strong\u003e No, the 18-3863 is matched to the Mercury 150 MAR V-6 serial number range 6038681 to C239553; outboards with serial numbers outside that range require a different head gasket part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988168618203,"sku":"SIE-18-3863","price":37.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3863_lg__67357.1558125418.500.750.jpg?v=1785189038"},{"product_id":"head-gasket-for-gm-454-7-4l-marine-engines-replaces-oem-30266-sierra-18-3874","title":"Sierra Head Gasket 18-3874, Replaces 30266, for GM 454 (7.4L) CID Engines","description":"\u003cp\u003eThe Sierra Head Gasket 18-3874 is a marine engine head gasket engineered to seal the joint between the cylinder head and engine block on GM 454 (7.4L) CID marine engines. Proper sealing at this joint is critical for maintaining compression, preventing coolant and oil intermixing, and protecting against combustion gas leakage that can lead to overheating or engine damage. This head gasket is manufactured to OEM specifications, allowing it to serve as a direct replacement in the position originally filled by the engine's factory gasket.\u003c\/p\u003e\u003cp\u003eThis part is sold priced per package and is designed as a direct cross-reference replacement for OEM part number 30266, making it straightforward to identify and order the correct gasket for a GM 454 (7.4L) CID engine rebuild or head gasket replacement job. Sierra is a long-established supplier of marine engine parts, and this gasket is intended for marine inboard applications using the GM 454 (7.4L) CID engine block.\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 18-3874\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Head Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.47 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282241667\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e GM 454 (7.4L) CID Eng.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Priced per Package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 30266\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM 454 (7.4L) CID Eng.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e30266\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-3874 head gasket fit?\u003c\/strong\u003e The Sierra 18-3874 head gasket is designed for GM 454 (7.4L) CID marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-3874 replace OEM part number 30266?\u003c\/strong\u003e Yes, Sierra 18-3874 is a direct replacement for OEM number 30266.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3874 head gasket weigh?\u003c\/strong\u003e It weighs 0.47 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this head gasket sold individually or in a package?\u003c\/strong\u003e The Sierra 18-3874 head gasket is priced per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3874 head gasket?\u003c\/strong\u003e The UPC for this head gasket is 808282241667.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3874 an OEM-spec gasket?\u003c\/strong\u003e Yes, this head gasket is manufactured to OEM specifications for GM 454 (7.4L) CID engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-3874 on a smaller GM engine like the 305 or 350?\u003c\/strong\u003e No, the 18-3874 head gasket is specified for GM 454 (7.4L) CID engines, not the 305 or 350 CID engines, which use different Sierra part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category does the 18-3874 head gasket fall under?\u003c\/strong\u003e This part is listed under Mercruiser Head Gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3874 head gasket seal correctly against oil and coolant leaks?\u003c\/strong\u003e The Sierra 18-3874 is designed to seal the cylinder head to block joint on a GM 454 (7.4L) CID engine, preventing coolant and combustion gas leakage when properly installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand makes part number 18-3874?\u003c\/strong\u003e Sierra manufactures the 18-3874 head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-3874 the only cross-reference number for this gasket?\u003c\/strong\u003e The listed OEM cross-reference for Sierra 18-3874 is 30266.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988168650971,"sku":"SIE-18-3874","price":83.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3874_lg__39454.1692043921.500.750.jpg?v=1785188254"},{"product_id":"marine-head-gasket-18-3876-for-gm-305-350-cid-5-0l-5-7l-v8-replaces-oem-16-50-00250","title":"Sierra Head Gasket 18-3876, Replaces 16.50-00204, for GM 181 CID (3.0L) Marine Engines","description":"\u003cp\u003eThe Sierra 18-3876 Head Gasket is a marine engine head gasket engineered for GM 181 CID (3.0L) inboard\/sterndrive engines. It seals the cylinder head to the engine block, maintaining compression and preventing coolant or combustion gases from leaking between the head and block during operation. Marine engines run under sustained load and temperature cycling that differ from automotive use, so using a gasket matched to the correct engine displacement and cylinder head design is important for a proper, lasting seal.\u003c\/p\u003e\u003cp\u003eThis head gasket is intended as a direct replacement for the OEM number it replaces, making it straightforward to identify the correct part when servicing a GM 181 CID (3.0L) marine engine. It is typically installed during head gasket replacement, cylinder head removal for valve or engine work, or as part of a broader engine rebuild or overhaul.\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 18-3876\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.57 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563101\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e GM 181 CID Eng. (3.0L)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM 181 CID Eng. (3.0L)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e16.50-00204\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-3876 head gasket fit?\u003c\/strong\u003e This gasket is designed for GM 181 CID (3.0L) marine engines, sealing the cylinder head to the engine block on that displacement engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-3876 replace?\u003c\/strong\u003e Sierra 18-3876 replaces OEM number 16.50-00204.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 16.50-00204 the same gasket as Sierra 18-3876?\u003c\/strong\u003e Yes, Sierra part 18-3876 is the direct replacement for OEM number 16.50-00204 on GM 181 CID (3.0L) marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3876 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3876 head gasket weighs 0.57 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this head gasket?\u003c\/strong\u003e A head gasket like the Sierra 18-3876 is replaced any time the cylinder head is removed for service, or if the existing gasket has failed and is leaking coolant or compression on a GM 181 CID (3.0L) engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket fit other GM engine displacements, like the 305 or 350?\u003c\/strong\u003e No, the 18-3876 is specific to the GM 181 CID (3.0L) engine; other displacements use a different Sierra part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-3876 is a Sierra-branded head gasket, sold under Sierra's own part number for GM 181 CID (3.0L) marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-3876?\u003c\/strong\u003e Ordering Sierra 18-3876 gets you one head gasket sized for a GM 181 CID (3.0L) marine engine cylinder head.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I identify this gasket by the number 16.50-00204 when searching?\u003c\/strong\u003e Yes, searching by 16.50-00204 will match this gasket, since Sierra 18-3876 is listed as its replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this head gasket?\u003c\/strong\u003e The UPC for the Sierra 18-3876 head gasket is 030999563101.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988168683739,"sku":"SIE-18-3876","price":42.42,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3876_lg__22307.1558126086.500.750.jpg?v=1785329163"},{"product_id":"head-gasket-for-mercury-135-150-xr4-outboards-replaces-oem-27-187851-sierra-18-3864","title":"Sierra 18-3864 Head Gasket, Replaces Mercury Marine 27-822844-1, Fits V-150 XR6\/MAGNUM III V-6 Outboard","description":"\u003cp\u003eThe Sierra 18-3864 Head Gasket is a machined outboard engine gasket built to seal the cylinder head on Mercury Marine outboard powerheads, sealing the mating surface between the cylinder head and the block to maintain compression and prevent coolant or combustion leaks. It is designed as a direct cross reference to Mercury Marine OEM part 27-822844-1, giving boat owners and marine technicians a Sierra-branded replacement for engine rebuilds, head resurfacing jobs, and routine maintenance on compatible Mercury outboards. The gasket is manufactured with a machined finish for a precise, consistent seal against the head and block surfaces.\u003c\/p\u003e\u003cp\u003eThis head gasket is intended for the Mercury V-150 (XR6\/MAGNUM III) V-6 outboard powerhead. It carries UPC 030999753724 and weighs 0.17 pounds, with compact packaged dimensions of 0.39 x 0.39 x 0.39 inches. As with all Sierra parts, the 18-3864 is backed by Sierra's standard customer satisfaction warranty, and it remains an actively available part, not discontinued by the manufacturer.\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 18-3864\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 27-822844-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999753724\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.17 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\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury V-150 (XR6\/MAGNUM III) V-6 outboard\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits the Mercury V-150 (XR6\/MAGNUM III) V-6 outboard powerhead.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eMercury Marine 27-822844-1\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercury outboard does the Sierra 18-3864 head gasket fit?\u003c\/strong\u003e The Sierra 18-3864 head gasket is built for the Mercury V-150 (XR6\/MAGNUM III) V-6 outboard powerhead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM Mercury Marine part number does 18-3864 replace?\u003c\/strong\u003e It replaces Mercury Marine part number 27-822844-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-3864 the correct part number to order?\u003c\/strong\u003e Yes, 18-3864 is the Sierra manufacturer part number for this head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this head gasket weigh?\u003c\/strong\u003e The Sierra 18-3864 head gasket weighs 0.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-3864 head gasket?\u003c\/strong\u003e It measures 0.39 x 0.39 x 0.39 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material or finish does the 18-3864 head gasket have?\u003c\/strong\u003e This gasket has a machined finish for a precise seal between the cylinder head and block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-3864 is a genuine Sierra part, manufactured as a direct replacement for Mercury Marine 27-822844-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3864 head gasket come with a warranty?\u003c\/strong\u003e Yes, Sierra parts including the 18-3864 head gasket are covered under Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3864 head gasket?\u003c\/strong\u003e The UPC for this head gasket is 030999753724.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHas the 18-3864 head gasket been discontinued by the manufacturer?\u003c\/strong\u003e No, the Sierra 18-3864 head gasket is not discontinued and remains actively available.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Sierra 18-3864 and OEM 27-822844-1?\u003c\/strong\u003e The Sierra 18-3864 is manufactured to the same specification as Mercury Marine OEM part 27-822844-1 and is designed as a direct replacement for it.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988168716507,"sku":"SIE-18-3864","price":41.12,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3864_lg__71569.1558125483.500.750.jpg?v=1785188317"},{"product_id":"marine-head-gasket-for-mercruiser-3-7l-1976-1989-and-460-ford-replaces-chrysler-4417375-mercruiser-27-13709-sierra-18-3878","title":"Sierra Head Gasket 18-3878, Replaces 27-52364, for GM 181 (3.0L) CID Marine Engines","description":"\u003cp\u003eThe Sierra 18-3878 is a head gasket engineered for GM 181 cubic inch (3.0L) CID marine engines. It seals the joint between the cylinder head and engine block, maintaining compression and preventing coolant or oil from leaking into the combustion chamber or crossing between cylinders. This is a common wear item during a top-end rebuild, cylinder head removal, or when addressing a blown gasket that is causing coolant loss, overheating, or compression loss.\u003c\/p\u003e\u003cp\u003eSierra manufactures this gasket to meet or exceed the specifications of the original equipment part it replaces, and it is built to install as a direct fit for GM 181 (3.0L) CID engines. The gasket has a white finish and is sold as a single-piece replacement part.\u003c\/p\u003e\u003cp\u003eEvery Sierra part is backed by Sierra's customer satisfaction warranty, giving boat owners and marine technicians a dependable option when servicing GM 181 (3.0L) powered engines.\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 18-3878\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head 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 0.51 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282258931\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GM 181 (3.0L) CID Engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM 181 (3.0L) CID Engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-52364\u003c\/li\u003e\n\u003cli\u003e27-81084\u003c\/li\u003e\n\u003cli\u003eFI5000204\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-3878 head gasket fit?\u003c\/strong\u003e The Sierra 18-3878 head gasket is designed for GM 181 cubic inch (3.0L) CID marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does 18-3878 replace?\u003c\/strong\u003e Sierra 18-3878 replaces OEM numbers 27-52364, 27-81084, and FI5000204.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3878 head gasket weigh?\u003c\/strong\u003e It weighs 0.51 pounds, as listed for the Sierra 18-3878 head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-3878 head gasket?\u003c\/strong\u003e The gasket has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3878 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is an aftermarket part manufactured by Sierra to meet or exceed the specifications of the original equipment head gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra back the 18-3878 head gasket with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-3878 head gasket is covered under Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-3878?\u003c\/strong\u003e The order includes one Sierra 18-3878 head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow can I confirm the 18-3878 is the correct head gasket for my engine?\u003c\/strong\u003e Match your engine to a GM 181 (3.0L) CID engine, or cross-check against OEM numbers 27-52364, 27-81084, or FI5000204, which the Sierra 18-3878 replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace a head gasket like the 18-3878?\u003c\/strong\u003e A head gasket such as the 18-3878 is typically replaced during a cylinder head removal, top-end rebuild, or when a failed gasket is causing coolant loss, overheating, or a loss of compression.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988169208027,"sku":"SIE-18-3878","price":42.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3878_lg__29126.1558126214.500.750.jpg?v=1785188121"},{"product_id":"sierra-18-3879-marine-head-gasket-replaces-crusader-33408-mercruiser-27-816460-omc-volvo-912227","title":"Sierra Head Gasket 18-3879 - Replaces 3853732 - Fits Ford 302 (5.0L) 351 (5.8L) CID Marine Engines","description":"\u003cp\u003eThe Sierra 18-3879 Head Gasket is a marine engine head gasket engineered to seal the mating surface between the cylinder head and engine block on Ford 302 (5.0L) and 351 (5.8L) CID marine engines. It is built to meet or exceed original equipment quality, giving it a reliable seal against combustion pressure, coolant, and oil at the head-to-block joint. A properly fitted head gasket is critical to engine performance: it prevents coolant from entering the cylinders, stops combustion gases from escaping into the cooling system, and maintains compression across all cylinders. The Sierra 18-3879 is a direct cross-reference for OEM part number 3853732, making it a straightforward replacement when servicing or rebuilding a compatible Ford marine powerhead. Whether you are performing a routine head gasket replacement after overheating, addressing a blown gasket, or completing a full engine rebuild, this gasket is sized and specified to match the original fitment for Ford 302 (5.0L) and 351 (5.8L) CID engines. Sierra manufactures marine parts to work reliably in the demanding marine environment, and this head gasket is designed as a like-for-like replacement for the original equipment part it supersedes.\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 18-3879\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e Ford 302 (5.0L) \/ 351 (5.8L) CID Engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 3853732\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.34 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563132\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFord 302 (5.0L) CID Engines\u003c\/li\u003e\n\u003cli\u003eFord 351 (5.8L) CID Engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3853732\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3879 head gasket fit?\u003c\/strong\u003e It fits Ford 302 (5.0L) and Ford 351 (5.8L) CID marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-3879 head gasket replace?\u003c\/strong\u003e It replaces OEM number 3853732, making the Sierra 18-3879 a direct cross-reference for that part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3879 head gasket made to OEM specifications?\u003c\/strong\u003e Yes, the Sierra 18-3879 Head Gasket is built to meet or exceed original equipment quality.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3879 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3879 Head Gasket weighs 0.34 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket work on a Ford 351 Windsor marine engine block?\u003c\/strong\u003e The Sierra 18-3879 is specified for Ford 302 (5.0L) and 351 (5.8L) CID engine displacements; confirm your engine's CID rating matches before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-3879?\u003c\/strong\u003e You receive one Sierra 18-3879 Head Gasket sized for the head-to-block joint on the applicable Ford 302 (5.0L) \/ 351 (5.8L) CID engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a marine engine need a head gasket replacement?\u003c\/strong\u003e A head gasket like the 18-3879 seals the cylinder head to the engine block; it is typically replaced after overheating, a blown gasket, or during an engine rebuild to restore proper compression and prevent coolant intrusion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3879 an aftermarket or genuine Sierra part?\u003c\/strong\u003e It is a genuine Sierra part, manufactured to meet or exceed the quality of the original equipment gasket it replaces (OEM 3853732).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the UPC to verify I am ordering the correct gasket?\u003c\/strong\u003e Yes, the Sierra 18-3879 Head Gasket carries UPC 030999563132, which can be used to confirm the exact part at checkout.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3879 fit both the 302 and 351 Ford CID engines with the same part number?\u003c\/strong\u003e Yes, the same Sierra 18-3879 part number covers both the Ford 302 (5.0L) and 351 (5.8L) CID engine applications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988169240795,"sku":"SIE-18-3879","price":44.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3879_lg__30968.1558126304.500.750.jpg?v=1785188227"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/collections\/SIE-18-99060__24574.1558189134.500.750.jpg?v=1785356514","url":"https:\/\/www.goodvibesmarina.com\/collections\/gvcat-engine-parts-systems-gaskets-seals-bearings-head-gaskets-gasket-sets.oembed?page=2","provider":"Good Vibes Marina","version":"1.0","type":"link"}