S&S Cycle 2017+ M8 Models 4.250in x 4.500in Piston Set - Standard

S&S Cycle 128 Inch Power Package Big Bore Kit for 2017-2022 oil-cooled 114/117 inch Harley-Davidson M-Eight engines (Will not fit water/oil-cooled engines). This big-bore bolt-on kit requires no case machining. It features 4-1/4″ bore cylinders with 11:1 forged pistons, an S&S oil pump/cam plate with a blue anodized finish, quickee pushrods with chrome pushrod tubes, S&S premium tappets, and hard-anodized, black-coated billet aluminum tappet cuffs for improved tappet stability in high-lift, high-rpm situations. The kit also includes S&S 550 cams (available in gear or chain drive) designed for big bore applications, and S&S valve springs compatible with cams up to .605° lift. All necessary gaskets, bearings, and hardware for bolt-on installation are included. Made in the U.S.A.