{"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","url":"https:\/\/www.goodvibesmarina.com\/products\/head-gasket-for-johnson-evinrude-9-5-hp-outboard-1964-1973-replaces-oem-309612-766870-sierra-18-2950-2-pack","provider":"Good Vibes Marina","version":"1.0","type":"link"}