{"product_id":"head-gasket-for-gm-454-cid-7-4l-big-block-v8-inboard-replaces-chris-craft-16-50-00259-and-mercruiser-27-1687-sierra-18-3877","title":"Sierra Head Gasket 18-3877 for GM 262 (4.3L) CID Marine Engines, Replaces 3854299","description":"\u003cp\u003eThe Sierra 18-3877 Head Gasket is a replacement head gasket engineered for GM 262 (4.3L) CID marine engines. It seals the mating surface between the cylinder head and engine block, maintaining proper compression and preventing coolant or combustion gas leaks between the two components. Installing a correctly fitted head gasket is a critical step whenever a cylinder head is removed for service, replaced, or resurfaced, since reusing a worn gasket can lead to compression loss, coolant intrusion into the cylinders, or oil leaks.\u003c\/p\u003e\u003cp\u003eThis gasket is finished in white and is sold as a single unit, ready to install as a direct replacement during a head gasket job on a supported GM 262 (4.3L) CID engine. Sierra parts are built to meet or exceed the specification of the original equipment part they replace, giving boat owners and marine technicians a dependable option when servicing GM-based marine 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 18-3877\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 0.45 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563118\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 gasket per unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e GM 262 (4.3L) CID Engine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM 262 (4.3L) CID Engine\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e3854299\u003c\/li\u003e\n\u003cli\u003e912227\u003c\/li\u003e\n\u003cli\u003e914930\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-3877 head gasket fit?\u003c\/strong\u003e The Sierra 18-3877 head gasket is designed for GM 262 (4.3L) CID marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3877 a direct replacement for OEM part 3854299?\u003c\/strong\u003e Yes, the Sierra 18-3877 head gasket is a cross-reference replacement for OEM numbers 3854299, 912227, and 914930.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-3877 head gasket?\u003c\/strong\u003e It is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3877 head gasket weigh?\u003c\/strong\u003e The Sierra 18-3877 head gasket weighs 0.45 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one order of 18-3877?\u003c\/strong\u003e Each order includes one Sierra 18-3877 head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket work on any V-8 marine engine?\u003c\/strong\u003e No, the Sierra 18-3877 is specified for GM 262 (4.3L) CID engines; a different Sierra part number is required for other GM engine displacements.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra's 18-3877 meet original equipment quality standards?\u003c\/strong\u003e Sierra states that this head gasket meets or exceeds the specification of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3877 head gasket?\u003c\/strong\u003e The UPC for the 18-3877 head gasket is 030999563118.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to replace both head gaskets if my engine has two cylinder heads?\u003c\/strong\u003e The 18-3877 listing covers a single head gasket for a GM 262 (4.3L) CID engine; check how many are needed for your specific engine build before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM numbers does 18-3877 cross-reference to?\u003c\/strong\u003e It cross-references to OEM numbers 3854299, 912227, and 914930.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988169306331,"sku":"SIE-18-3877","price":56.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3877_lg__78682.1558126166.500.750.jpg?v=1785189207","url":"https:\/\/www.goodvibesmarina.com\/products\/head-gasket-for-gm-454-cid-7-4l-big-block-v8-inboard-replaces-chris-craft-16-50-00259-and-mercruiser-27-1687-sierra-18-3877","provider":"Good Vibes Marina","version":"1.0","type":"link"}