{"product_id":"1000cc-piston-set-030-oversize-keith-black-kb292-030-ironhead-1972-1985","title":"1000cc Piston Set.030 Oversize - Keith Black KB292.030 - Ironhead 1972-1985","description":"\u003cp\u003e\u003cstrong\u003eKeith Black #:\u003c\/strong\u003e KB292.030\u003c\/p\u003e\n\u003cp\u003eKeith Black dome piston set is.030 oversize with a 8.2 compression ratio for 1972-1985 XL 1000cc 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.030 oversize for a 3.188 inch bore and has a 9:1 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\u003ctr\u003e\n\u003ctd\u003e1972-1985\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"http:\/\/www.vtwinmfg.com\/Instructions\/MS\/KB%20Inst.%20Guide%20XL%20Dome%20Pistons%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":67549414129822,"sku":"11-2243","price":289.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1692\/2127\/files\/11-2243.jpg?v=1791652209","url":"https:\/\/chopcult.com\/products\/1000cc-piston-set-030-oversize-keith-black-kb292-030-ironhead-1972-1985","provider":"ChopCult","version":"1.0","type":"link"}