{"product_id":"keith-black-kb258-030-80-inch-evolution-flat-piston-kit-030","title":"Keith Black KB258.030 80-Inch Evolution Flat Piston Kit .030","description":"Keith Black flat top piston set is .030 oversize with an 8.6:1 compression ratio for 1984-up Big Twin Evolution models.\n\u003cp\u003eThe Keith Black KB258.030 80-inch Evolution Flat Piston Kit .030 features a hypereutectic alloy piston cast in a permanent steel mold. This construction supports a lightweight piston design intended to help produce more power, improve fuel economy, and provide long service life.\u003c\/p\u003e\u003cp\u003eThe piston is .030 oversize for a 3.498-inch bore and has an 8.5:1 compression ratio. The alloy’s low heat transfer helps keep the skirts cooler and minimizes piston expansion. Combined with high compression ring placement, this design is intended to support power and economy while reducing detonation and increasing top-ring temperature.\u003c\/p\u003e\u003cp\u003eFor proper break-in, run the engine at moderate speeds for at least 500 miles and avoid excessive operation in lower gears. The Keith Black KB258.030 kit fits 1984–1993 Harley-Davidson FXR models as listed in the product data. Suggested item: 11-1366 80-inch Shovelhead Piston Ring Set .030.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrand: Keith Black\u003c\/li\u003e\n\u003cli\u003ePart Number: KB258.030\u003c\/li\u003e\n\u003cli\u003eApplication: 80-inch Evolution engine\u003c\/li\u003e\n\u003cli\u003ePiston Type: Flat piston kit\u003c\/li\u003e\n\u003cli\u003eOversize: .030 for a 3.498-inch bore\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 8.5:1\u003c\/li\u003e\n\u003cli\u003eMaterial: Hypereutectic alloy\u003c\/li\u003e\n\u003cli\u003eConstruction: Cast in a permanent steel mold\u003c\/li\u003e\n\u003cli\u003eDesign: Low heat transfer alloy with high compression ring placement\u003c\/li\u003e\n\u003cli\u003eFitment: 1984–1993 Harley-Davidson FXR models\u003c\/li\u003e\n\u003cli\u003eBreak-In Requirement: Run at moderate speeds for at least 500 miles and avoid excessive operation in lower gears\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\nHarley Davidson FLST  1986\u003cbr\u003e\nHarley Davidson FLST  1987\u003cbr\u003e\nHarley Davidson FLST  1988\u003cbr\u003e\nHarley Davidson FLST  1989\u003cbr\u003e\nHarley Davidson FLST  1990\u003cbr\u003e\nHarley Davidson FLST  1991\u003cbr\u003e\nHarley Davidson FLST  1992\u003cbr\u003e\nHarley Davidson FLST  1993\u003cbr\u003e\nHarley Davidson FLST  1994\u003cbr\u003e\nHarley Davidson FLST  1995\u003cbr\u003e\nHarley Davidson FLST  1996\u003cbr\u003e\nHarley Davidson FLST  1997\u003cbr\u003e\nHarley Davidson FLST  1998\u003cbr\u003e\nHarley Davidson FLT  1984\u003cbr\u003e\nHarley Davidson FLT  1985\u003cbr\u003e\nHarley Davidson FLT  1986\u003cbr\u003e\nHarley Davidson FLT  1987\u003cbr\u003e\nHarley Davidson FLT  1988\u003cbr\u003e\nHarley Davidson FLT  1989\u003cbr\u003e\nHarley Davidson FLT  1990\u003cbr\u003e\nHarley Davidson FLT  1991\u003cbr\u003e\nHarley Davidson FLT  1992\u003cbr\u003e\nHarley Davidson FLT  1993\u003cbr\u003e\nHarley Davidson FLT  1994\u003cbr\u003e\nHarley Davidson FLT  1995\u003cbr\u003e\nHarley Davidson FLT  1996\u003cbr\u003e\nHarley Davidson FLT  1997\u003cbr\u003e\nHarley Davidson FLT  1998\u003cbr\u003e\nHarley Davidson FXD  1991\u003cbr\u003e\nHarley Davidson FXD  1992\u003cbr\u003e\nHarley Davidson FXD  1993\u003cbr\u003e\nHarley Davidson FXD  1994\u003cbr\u003e\nHarley Davidson FXD  1995\u003cbr\u003e\nHarley Davidson FXD  1996\u003cbr\u003e\nHarley Davidson FXD  1997\u003cbr\u003e\nHarley Davidson FXD  1998\u003cbr\u003e\nHarley Davidson FXR  1984\u003cbr\u003e\nHarley Davidson FXR  1985\u003cbr\u003e\nHarley Davidson FXR  1986\u003cbr\u003e\nHarley Davidson FXR  1987\u003cbr\u003e\nHarley Davidson FXR  1988\u003cbr\u003e\nHarley Davidson FXR  1989\u003cbr\u003e\nHarley Davidson FXR  1990\u003cbr\u003e\nHarley Davidson FXR  1991\u003cbr\u003e\nHarley Davidson FXR  1992\u003cbr\u003e\nHarley Davidson FXR  1993\u003cbr\u003e\nHarley Davidson FXR  1994\u003cbr\u003e\nHarley Davidson FXST  1984\u003cbr\u003e\nHarley Davidson FXST  1985\u003cbr\u003e\nHarley Davidson FXST  1986\u003cbr\u003e\nHarley Davidson FXST  1987\u003cbr\u003e\nHarley Davidson FXST  1988\u003cbr\u003e\nHarley Davidson FXST  1989\u003cbr\u003e\nHarley Davidson FXST  1990\u003cbr\u003e\nHarley Davidson FXST  1991\u003cbr\u003e\nHarley Davidson FXST  1992\u003cbr\u003e\nHarley Davidson FXST  1993\u003cbr\u003e\nHarley Davidson FXST  1994\u003cbr\u003e\nHarley Davidson FXST  1995\u003cbr\u003e\nHarley Davidson FXST  1996\u003cbr\u003e\nHarley Davidson FXST  1997\u003cbr\u003e\nHarley Davidson FXST  1998","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":44583444021335,"sku":"11-2220","price":512.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0556\/2276\/2583\/files\/11-2220.jpg?v=1793268664","url":"https:\/\/valleyspeed.net\/en-us\/products\/keith-black-kb258-030-80-inch-evolution-flat-piston-kit-030","provider":"The Speed Shop Canada","version":"1.0","type":"link"}