S&S Cycle 2017+ M8 Models 4.320in Bore 4.500in Stroke Cylinder Kit - Wrinkle Black w/o Highlight

The biggest Big Bore possible with a slip in kit! The S&S 4.320" bore cylinder kit takes your 107" M8 to 129" and the 114" to 132".

This Part Fits:

Year	Make	Model	Submodel
2018-2021	Harley-Davidson	FLFBS Fat Boy 114	Base
2018-2021	Harley-Davidson	FLHCS Heritage Classic 114	Base
2017-2021	Harley-Davidson	FLHR Road King	Base
2017-2019	Harley-Davidson	FLHRC Road King Classic	Base
2017-2021	Harley-Davidson	FLHRXS Road King Special	Base
2017-2019	Harley-Davidson	FLHTCU Electra Glide Ultra Classic	Base
2017-2021	Harley-Davidson	FLHTK Ultra Limited	Base
2017-2020	Harley-Davidson	FLHTKL Ultra Limited Low	Base
2017-2021	Harley-Davidson	FLHX Street Glide	Base
2017-2021	Harley-Davidson	FLHXS Street Glide Special	Base
2017-2020	Harley-Davidson	FLTRU Road Glide Ultra	Base
2017-2021	Harley-Davidson	FLTRX Road Glide	Base
2018-2020	Harley-Davidson	FXBRS Breakout 114	Base
2018-2021	Harley-Davidson	FXFBS Fat Bob 114	Base