{"product_id":"biglknm-top-end-gasket-kit-for-harley-evo-big-twin-80ci-1340cc-silicone-head-gaskets-complete-seal-set","title":"BIGLKNM Top-End Gasket Kit for Harley EVO Big Twin 80ci 1340cc — Silicone Head Gaskets, Complete Seal Set","description":"\u003cb\u003eBIGLKNM Top End Gasket Kit is a complete gasket and seal set designed to replace the top-end components on Harley-Davidson EVO Big Twin 80ci (1340cc) motorcycles.\u003c\/b\u003e\n\n\u003cp\u003eThis full top-end gasket kit includes head gaskets, cylinder base gaskets, rocker cover gaskets, intake seals, O-rings and backing plates to restore proper sealing for late-model EVO Big Twin engines. Built with silicone head gaskets and NBR (nitrile) O-rings and seals, the set is intended for routine engine rebuilds, top-end jobs, or whenever a reliable replacement of all upper-end sealing components is required. The kit covers many Dyna, Softail, Super Glide and Touring variants built in the 1980s and 1990s.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Harley models and years will this kit fit?\u003c\/h3\u003e\n\u003cp\u003eThe BIGLKNM kit fits a broad selection of EVO Big Twin 80ci (1340cc) motorcycles. It’s specified for various Dyna, Softail, Super Glide and Touring models produced during the 1980s and 1990s, including several EFI and anniversary editions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDyna family: 1994–1998 Low Rider, FXDL, FXDB, FXRP Police and convertible\/custom variants.\u003c\/li\u003e\n  \u003cli\u003eSuper Glide: multiple FXD and EFI model variants including FXDI, FXDCI, FXDWG series.\u003c\/li\u003e\n  \u003cli\u003eTouring: FLT\/FLTC\/Ultra Classic and Ultra Glide EFI versions (FLTCI, FLTCUI).\u003c\/li\u003e\n  \u003cli\u003eSoftail: FXST\/Fxstc and related 1984–1998 Softail Evolution models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials are used and why do they matter?\u003c\/h3\u003e\n\u003cp\u003eBIGLKNM uses silicone for the head gaskets and NBR (nitrile) for O-rings and seals, chosen for heat tolerance and oil resistance. These materials provide a balance of flexibility and durability suitable for air-cooled EVO engines operating at higher temperatures and oil exposure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSilicone head gaskets: resist compression set and high cylinder temperatures.\u003c\/li\u003e\n  \u003cli\u003eNBR O-rings\/seals: durable against engine oil and common fuels.\u003c\/li\u003e\n  \u003cli\u003ePrecision-cut backing plates and washers: help ensure consistent clamping and sealing.\u003c\/li\u003e\n  \u003cli\u003eComplete set: reduces the risk of missing a required seal during reassembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat parts are included in the full top-end set?\u003c\/h3\u003e\n\u003cp\u003eThe package supplies all the primary sealing pieces needed for a top-end rebuild, so you won’t have to source multiple separate gaskets. The kit is designed to provide a one-stop replacement for the upper engine sealing surfaces.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHead gasket(s) and cylinder base gasket(s) for both cylinders.\u003c\/li\u003e\n  \u003cli\u003eUpper and lower rocker cover gaskets, intake manifold gaskets and backing plates.\u003c\/li\u003e\n  \u003cli\u003eVarious O-rings, rubber seals, washers and small hardware pieces.\u003c\/li\u003e\n  \u003cli\u003eComplete contents shown in product images for quick verification before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will this kit affect a top-end service or rebuild?\u003c\/h3\u003e\n\u003cp\u003eUsing a comprehensive gasket kit simplifies teardown and reassembly by providing matched sealing components and materials. It helps ensure uniform sealing surfaces and reduces the chance of leaks commonly caused by aging or mismatched gaskets.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSpeeds up maintenance by including all necessary upper-end seals in one box.\u003c\/li\u003e\n  \u003cli\u003eProvides like-for-like replacements for original EVO top-end components.\u003c\/li\u003e\n  \u003cli\u003eHelps achieve reliable compression sealing and prevents oil or air leaks.\u003c\/li\u003e\n  \u003cli\u003eIdeal for preventative maintenance or during head\/cylinder work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The BIGLKNM Top End Gasket Kit is meant for DIY mechanics, professional motorcycle technicians and restoration enthusiasts working on Harley-Davidson EVO Big Twin 80ci (1340cc) engines from the listed Dyna, Softail, Super Glide and Touring model years. If you’re planning a top-end rebuild, valve job, or replacing worn seals, this kit supplies the matched components needed to complete the job correctly.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this kit include both head gaskets and rocker cover gaskets?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit contains head gaskets, cylinder base gaskets, upper and lower rocker cover gaskets, plus O-rings and seals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the seals compatible with oil and heat in EVO engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Head gaskets are silicone and O-rings\/seals are NBR, chosen for oil resistance and high-temperature stability.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"BIGLKNM","offers":[{"title":"Default Title","offer_id":48086742630558,"sku":"B0D967PTR3","price":51.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/biglknm-front-packaging-top-end-gasket-kit.jpg?v=1785903375","url":"https:\/\/northtrailauto.ca\/products\/biglknm-top-end-gasket-kit-for-harley-evo-big-twin-80ci-1340cc-silicone-head-gaskets-complete-seal-set","provider":"North Trail Auto","version":"1.0","type":"link"}