{"product_id":"80-evolution-domed-piston-kit-010-keith-black-kb266-010-evolution-1984-1998","title":"80 Evolution Domed Piston Kit.010\" - Keith Black KB266.010 - Evolution 1984-1998","description":"\u003cp\u003e\u003cstrong\u003eKeith Black #:\u003c\/strong\u003e KB266.010\u003c\/p\u003e\n\u003cp\u003eKeith Black dome piston set is.010 oversize with a 10.5:1 compression ratio for 1984-up Big Twin Evolution models.\u003c\/p\u003e\n\u003cp\u003eThe Keith Black 390 hypereutectic alloy is cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer. Pistons are.010 over sized for a 3.498 inch bore and has a 10.5:1 compression ratio. The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal. The combination of a low heat transfer piston alloy and high compression ring placement increases power and economy. The high ring placement alone reduces detonation and increases the top ring temperature. **Note: Run engine at moderate speeds for at least 500 miles avoiding excessive running in lower gears in order to properly break-in new pistons and rings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1986-1998\u003c\/td\u003e\n\u003ctd\u003eFLST\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1984-1998\u003c\/td\u003e\n\u003ctd\u003eFLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1991-1998\u003c\/td\u003e\n\u003ctd\u003eFXD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1984-1994\u003c\/td\u003e\n\u003ctd\u003eFXR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1984-1998\u003c\/td\u003e\n\u003ctd\u003eFXST\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"http:\/\/www.vtwinmfg.com\/Instructions\/MS\/KB%20Conversion%20Piston%20Guide%20and%20Fitment.pdf\" target=\"_blank\" rel=\"noopener\"\u003eInstallation instructions (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":67549413408926,"sku":"11-2224","price":269.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1692\/2127\/files\/11-2224.jpg?v=1791652181","url":"https:\/\/chopcult.com\/products\/80-evolution-domed-piston-kit-010-keith-black-kb266-010-evolution-1984-1998","provider":"ChopCult","version":"1.0","type":"link"}