{"product_id":"1985-1998-harley-davidson-big-twin-big-bore-head-gasket-040-fkm-rubber-mls-steel","title":"1985-1998 Harley Davidson Big Twin Big Bore Head Gasket .040\" - FKM Rubber MLS Steel","description":"\u003cp\u003eThis Multi-Layer Steel (MLS) head gasket is a high-performance sealing solution specifically engineered for Big Bore applications of the 1985-1998 Evolution Big Twin engine. Constructed from premium stainless steel and enhanced with a specialized FKM (Viton) rubber coating, this gasket is designed to handle the increased cylinder pressures and thermal expansion associated with high-displacement, modified engines. The stainless steel core provides essential structural tension, while the FKM outer layer ensures a precision micro-seal against oil, heat, and combustion gases.\u003c\/p\u003e\n\n\u003cp\u003eWith a thickness of .040\", this direct-fit gasket is built to maintain reliable sealing integrity and consistent deck height under the rigorous operating conditions of a modified V-Twin. It is an ideal choice for riders and builders seeking a robust, leak-proof barrier during top-end rebuilds or performance upgrades for classic Evolution-era Big Twin motorcycles.\u003c\/p\u003e","brand":"Harley-Davidson","offers":[{"title":"Default Title","offer_id":53028100899040,"sku":"NFHGBTMLSBB040","price":13.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0790\/8451\/9648\/files\/BigTwin_1200ccSportsterHeadGasket_HGBTMLSSB040.png?v=1781094649","url":"https:\/\/nightforgeparts.com\/products\/1985-1998-harley-davidson-big-twin-big-bore-head-gasket-040-fkm-rubber-mls-steel","provider":"Night Forge Parts","version":"1.0","type":"link"}