S&S Cycle

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...

This bolt-in big bore kit is easy to install, and requires no machining or rebalancing. This is the largest bore (3.937") that can be fit in a stock engine case. Stock engine height is maintained so...

Thousands of hours of engine testing have proved the forged rocker arm kit to be superior to other non-roller rocker arms. An economical solution for stock rebuilds and mild performance upgrades.

If you're pushing the limits, it's time to upgrade. S&S Chrome Moly Head Studs are built to handle the heat, torque, and abuse that comes with high-performance builds. Don't let stock studs be your...

Building your M8 for big power? S&S has the parts you need to bulletproof the top end of your valvetrain in one convenient kit! S&S performance parts are direct replacement for OEM pieces, but are...

Stronger material with a 14% increase in strength over stockThis Part Fits:YearMakeModelSubmodel2018-2019Harley-DavidsonFLFBS Fat Boy 114Base2018-2019Harley-DavidsonFLHCS Heritage Classic...