S&S Cycle 2017+ M8 Models 4.250in Bore 4-5/8in Stroke Cylinder Kit - Black Granite w/ Highlight

S&S has been building big bore kits since the 60s and has it down to an absolute science. Our latest efforts are aimed at the Milwaukee Eight® platform (2017 and newer big twins) and open up a whole new level of performance for these engines. Combining a new design forged piston with their 4.25" cylinders to net a tire melting 131 cubic inches when paired with their 4.625" stroker crank. We build our big bore kits and cranks to much tighter tolerarances and with higher quality materials than the factory parts. This new piston/cylinder kit will be a solid platform for massive power.

This Part Fits:

Year	Make	Model	Submodel
2018-2020	Harley-Davidson	FLFBS Fat Boy 114	Base
2018-2020	Harley-Davidson	FLHCS Heritage Classic 114	Base
2017-2020	Harley-Davidson	FLHR Road King	Base
2017-2019	Harley-Davidson	FLHRC Road King Classic	Base
2017-2020	Harley-Davidson	FLHRXS Road King Special	Base
2019-2020	Harley-Davidson	FLHT Electra Glide Standard	Base
2017-2019	Harley-Davidson	FLHTCU Electra Glide Ultra Classic	Base
2020	Harley-Davidson	FLHTCUTGSE CVO Tri Glide	Base
2017-2020	Harley-Davidson	FLHTK Ultra Limited	Base
2017-2020	Harley-Davidson	FLHTKL Ultra Limited Low	Base
2017-2020	Harley-Davidson	FLHTKSE CVO Limited	Base
2017-2020	Harley-Davidson	FLHX Street Glide	Base
2017-2020	Harley-Davidson	FLHXS Street Glide Special	Base
2017-2020	Harley-Davidson	FLHXSE CVO Street Glide	Base
2017-2020	Harley-Davidson	FLRT Freewheeler	Base
2020	Harley-Davidson	FLTRK Road Glide Limited	Base
2017-2020	Harley-Davidson	FLTRU Road Glide Ultra	Base
2017-2020	Harley-Davidson	FLTRX Road Glide	Base
2017-2020	Harley-Davidson	FLTRXS Road Glide Special	Base
2018-2020	Harley-Davidson	FXBRS Breakout 114	Base
2019-2020	Harley-Davidson	FXDRS FXDR 114	Base
2018-2020	Harley-Davidson	FXFBS Fat Bob 114	Base