{"product_id":"cometic-evo-big-twin-twin-cam-primary-housing-gasket-only-big-twin-ea-1-pk-oe-68-9179f1","title":"Cometic Evo Big Twin\/Twin Cam Primary Housing Gasket - Harley Big Twin","description":"\u003c!-- vt:seo-start --\u003e\n\u003cdiv class=\"vt-brand-bio\" style=\"background:#f6f6f6;border-left:4px solid #c8102e;padding:14px 18px;margin:0 0 20px;border-radius:4px;\"\u003e\n\u003ch2 style=\"margin:0 0 6px;font-size:1.05em;\"\u003eAbout Cometic\u003c\/h2\u003e\n\u003cp style=\"margin:0;font-size:0.95em;line-height:1.6;\"\u003eCometic Gasket manufactures multi-layer steel head gaskets and complete gasket kits in Concord, Ohio. On a built V-twin running higher compression or a big-bore kit, the MLS head gasket is what keeps the top end sealed — which is why Cometic is the default spec on so many engine builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"line-height:1.65;\"\u003eEnsure a leak-free primary housing on your Harley Big Twin with this Cometic Gasket. Designed for both Evo and Twin Cam engines, this OEM-quality replacement gasket is engineered to withstand engine vibration and heat cycles. It provides a reliable seal to keep your primary fluids contained.\u003c\/p\u003e\n\u003ch3 style=\"margin:20px 0 6px;\"\u003eWhy riders pick this\u003c\/h3\u003e\u003cul style=\"padding-left:20px;margin:0 0 16px;\"\u003e\n\u003cli style=\"margin:3px 0;\"\u003eOEM-quality primary housing gasket\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eFits Evo Big Twin and Twin Cam engines\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003eDesigned to seal against vibration and heat\u003c\/li\u003e\n\u003cli style=\"margin:3px 0;\"\u003ePrevents primary fluid leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA leaking primary can be a messy and frustrating issue for any Harley rider. This Cometic primary housing gasket is specifically designed to provide a tight, dependable seal between your primary cover and engine case. Its robust construction ensures it can handle the unique demands of Evo Big Twin and Twin Cam powerplants, preventing fluid loss and keeping your drivetrain components protected.\u003c\/p\u003e\u003ch3\u003eReliable Primary Sealing for Your Harley\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM-specification gasket material for a precise fit\u003c\/li\u003e\n\u003cli\u003eDesigned for Evo Big Twin and Twin Cam engines\u003c\/li\u003e\n\u003cli\u003eResists engine vibration and temperature fluctuations\u003c\/li\u003e\n\u003cli\u003eHelps prevent oil leakage from the primary housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eEssential for Maintenance and Rebuilds\u003c\/h3\u003e\u003cp\u003eWhether you're performing routine maintenance, upgrading your clutch, or rebuilding your engine, replacing the primary housing gasket is a critical step. This Cometic gasket is a direct replacement, simplifying installation and ensuring proper sealing. Always consult your service manual for torque specifications and any recommended sealants for your specific Harley-Davidson model.\u003c\/p\u003e\n\u003ch3 style=\"margin:20px 0 6px;\"\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Cometic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e C9179F1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 23 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 13.5 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 0.4 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eCommon questions\u003c\/h3\u003e\u003cdiv class=\"vt-faq\"\u003e\n\u003cdiv style=\"margin:0 0 12px;\"\u003e\n\u003cp style=\"margin:0 0 3px;font-weight:600;\"\u003eWill this gasket fit my Evo Big Twin engine?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eYes, this Cometic gasket is specifically designed for Evo Big Twin and Twin Cam primary housings on Harley-Davidson models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin:0 0 12px;\"\u003e\n\u003cp style=\"margin:0 0 3px;font-weight:600;\"\u003eIs this a direct replacement for the original equipment gasket?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eYes, Cometic manufactures this gasket to OEM specifications, ensuring it is a direct-fit replacement for your primary housing seal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin:0 0 12px;\"\u003e\n\u003cp style=\"margin:0 0 3px;font-weight:600;\"\u003eDo I need to use sealant with this gasket?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.6;\"\u003eAlways consult the primary cover service manual for your specific engine and model year. Some applications may benefit from a light bead of gasket sealant during assembly to ensure optimal sealing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"vt-confidence\" style=\"border-top:1px solid #e5e5e5;margin:24px 0 0;padding:16px 0 0;font-size:0.92em;line-height:1.6;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;\"\u003eOrdering from Vtwinbikers\u003c\/h3\u003e\n\u003cul style=\"padding-left:20px;margin:0;\"\u003e\n\u003cli\u003eBrand new, sourced through authorized US distribution — never used, never grey-market.\u003c\/li\u003e\n\u003cli\u003eNot sure it fits? Use \u003cstrong\u003eShop by Bike\u003c\/strong\u003e to filter by your year and model, or email us and we will confirm before you order.\u003c\/li\u003e\n\u003cli\u003eHarley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vtwinbikers.com\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Gaskets\/Seals\",\"item\":\"https:\/\/vtwinbikers.com\/collections\/all\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Cometic\",\"item\":\"https:\/\/vtwinbikers.com\/collections\/cometic\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Cometic Evo Big Twin\/Twin Cam Primary Housing Gasket - Harley Big Twin\",\"item\":\"https:\/\/vtwinbikers.com\/products\/cometic-evo-big-twin-twin-cam-primary-housing-gasket-only-big-twin-ea-1-pk-oe-68-9179f1\"}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Will this gasket fit my Evo Big Twin engine?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, this Cometic gasket is specifically designed for Evo Big Twin and Twin Cam primary housings on Harley-Davidson models.\"}},{\"@type\":\"Question\",\"name\":\"Is this a direct replacement for the original equipment gasket?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, Cometic manufactures this gasket to OEM specifications, ensuring it is a direct-fit replacement for your primary housing seal.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to use sealant with this gasket?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Always consult the primary cover service manual for your specific engine and model year. Some applications may benefit from a light bead of gasket sealant during assembly to ensure optimal sealing.\"}}]}\u003c\/script\u003e\n\u003c!-- vt:seo-end --\u003e","brand":"Cometic","offers":[{"title":"Default Title","offer_id":53035125833839,"sku":"68-9179F1","price":44.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_63d0dc09-c184-4c29-b0e5-feba9e5a0d26.png?v=1779560690","url":"https:\/\/vtwinbikers.com\/products\/cometic-evo-big-twin-twin-cam-primary-housing-gasket-only-big-twin-ea-1-pk-oe-68-9179f1","provider":"Vtwinbikers","version":"1.0","type":"link"}