{"product_id":"james-gaskets-big-twin-gasket-kit-set-cyl-head-base-3-5-8-bore-kit-16770-86-s-681-4392","title":"James Gaskets Big Twin Gasket Kit - SET CYL Head\/Base 3 5\/8 Bore KIT 16770-86-S — Harley-Davidson (1955-2026)","description":"\u003cp\u003eJames Gaskets Big Twin gasket kit for 3 5\/8-inch bore cylinders, containing cylinder head and base gaskets needed for top-end rebuilds or base gasket replacement. Direct replacement for standard Big Twin V-twin engines.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCylinder head gasket included\u003c\/li\u003e\n  \u003cli\u003eBase gasket included\u003c\/li\u003e\n  \u003cli\u003e3 5\/8 inch bore specification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e James Gaskets\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 16770-86-S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.156 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits Big Twin engines with 3 5\/8-inch bore cylinders.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat gaskets are included in this kit?\u003c\/h3\u003e\n\u003cp\u003eCylinder head and base gaskets — the two most critical seals needed for a top-end rebuild or base service.\u003c\/p\u003e\n\u003ch3\u003eWill this fit my engine if I don't know the bore size?\u003c\/h3\u003e\n\u003cp\u003eThis kit is specifically for 3 5\/8-inch bore cylinders. Check your engine manual or existing gasket packaging to confirm bore size before ordering.\u003c\/p\u003e\n\u003ch3\u003eDo I need any other gaskets for a complete rebuild?\u003c\/h3\u003e\n\u003cp\u003eThis kit covers the head and base. Additional gaskets like rocker cover, oil pump, or cam cover may be needed depending on your rebuild scope.\u003c\/p\u003e\n\u003ch3\u003eAre these OEM spec?\u003c\/h3\u003e\n\u003cp\u003eJames Gaskets manufactures these to OEM Big Twin specifications as direct replacements.\u003c\/p\u003e","brand":"James Gaskets","offers":[{"title":"Default Title","offer_id":53035190681711,"sku":"681-4392","price":51.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_e099c3c6-ce61-4b82-b3df-04a0e0798d70.png?v=1779560867","url":"https:\/\/vtwinbikers.com\/products\/james-gaskets-big-twin-gasket-kit-set-cyl-head-base-3-5-8-bore-kit-16770-86-s-681-4392","provider":"Vtwinbikers","version":"1.0","type":"link"}