{"product_id":"80-flh-fx-piston-set-040-oversize-keith-black-kb297-040","title":"80 FLH-FX Piston Set.040 Oversize - Keith Black KB297.040","description":"\u003cp\u003e\u003cstrong\u003eKeith Black #:\u003c\/strong\u003e KB297.040\u003c\/p\u003e\n\u003cp\u003eKeith Black piston set is.040 oversize and is for a 3.498 inch bore. Piston set has a compression of 8.3:1 and includes rings.\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.040 oversize for a 3.498 inch bore and has a 9.5:1 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\u003e1978-1984\u003c\/td\u003e\n\u003ctd\u003eFL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1979-1983\u003c\/td\u003e\n\u003ctd\u003eFLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1978-1984\u003c\/td\u003e\n\u003ctd\u003eFX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1982-1983\u003c\/td\u003e\n\u003ctd\u003eFXR\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%20Sym-Asym%20Piston%20Installation%20Guide.pdf\" target=\"_blank\" rel=\"noopener\"\u003eInstallation instructions (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":67549414523038,"sku":"11-2256","price":269.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1692\/2127\/files\/11-2256.jpg?v=1791652221","url":"https:\/\/chopcult.com\/products\/80-flh-fx-piston-set-040-oversize-keith-black-kb297-040","provider":"ChopCult","version":"1.0","type":"link"}