Pistons - Rings - Cylinders

This is the largest bore (3.937") that can be fit in a stock engine case Stock engine height is maintained so there are no manifold or frame fitment issues The S&S 11 fin cylinder design closely resembles OEM shape and come prefinished - ready...

Big Bore kit yields excellent results with stock cylinder heads This is the largest bore (3.937") that can fit in a stock engine case Stock engine height is maintained so there are no manifold or frame fitment issues Easy installation no need to...

Big Bore kit yields excellent results with stock cylinder heads This is the largest bore (3.937") that can be fit in a stock engine case Stock engine height is maintained so there are no manifold or frame fitment issues Easy installation no need to...

High quality replacement cylinder studs provide increased strength and extended durability 3/8-16 x 5.760" Meet or exceed OE standards Made in the U.S.A. Compatible Vehicles Years Make Make Notes 1995-1997 Harley-Davidson Bad Boy...

High quality replacement cylinder studs provide increased strength and extended durability 3/8-16 x 6.070" Meet or exceed OE standards Made in the U.S.A. Compatible Vehicles Years Make Make Notes 2011-2013 Harley-Davidson Blackline...

High quality replacement cylinder studs provide increased strength and extended durability 3/8-16 x 6.680" Meet or exceed OE standards Made in the U.S.A. Compatible Vehicles Years Make Make Notes 1995-1997 Harley-Davidson Bad Boy...

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance Bolt-in kits do not require machining, rebalancing or engine removal,...

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance Bolt-in kits do not require machining, rebalancing or engine removal,...

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance Bolt-in kits do not require machining, rebalancing or engine removal,...

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance Bolt-in kits do not require machining, rebalancing or engine removal,...

4.25" stroke length Flat top piston head shape +0.020" bore oversize These forged, 4" bore flat-topped pistons are intended for use in S&S 4" bore Super Sidewinder engines as well as other custom 4" bore engines Piston kit...

Deck height is 1.0985" Wristpin diameter is .927" Standard 4.0" bore Piston features a 12.5cc raised dome to achieve a compression ratio of 10.6:1 For 2007-'17 HD CVO 110 engines (except '17 touring models) Compatible...