{"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","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2963-exhaust-cover-gasket-for-johnson-evinrude-50-hp-outboard-1971-1975-replaces-omc-318925","provider":"Good Vibes Marina","version":"1.0","type":"link"}