{"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","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-head-gasket-18-3876-for-gm-305-350-cid-5-0l-5-7l-v8-replaces-oem-16-50-00250","provider":"Good Vibes Marina","version":"1.0","type":"link"}