-
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...$1,559.95 -
We recommend using S&S Cycle Head Bolts for M8, part number 900-1006 for all big bore applicationsThis Part Fits:YearMakeModelSubmodel2018-2020Harley-DavidsonFLDE Deluxe 107Base2018-2021Harley-DavidsonFLFBS Fat Boy 114Base2018-2021Harley-DavidsonFLHCS...$1,643.95 -
The S&S Power Package is the ideal combination of performance and savings designed to transform your engine without breaking the bank. The latest kits combine our biggest big bore cylinders (4.32 in.) with matched cam/cam plate/ oil pump and everything...$3,359.95 -
ProX Piston Kits are comprehensive coming complete with: Piston / Ring Kit / Wrist Pin / Cir Clips. ProX also offers oversized piston options in order to follow manufaturer Piston to Cylinder Wall clearances. ProX pistons are precision machined on the...$127.62$141.80 -
ProX Piston Kits are comprehensive coming complete with: Piston / Ring Kit / Wrist Pin / Cir Clips. ProX also offers oversized piston options in order to follow manufaturer Piston to Cylinder Wall clearances. ProX pistons are precision machined on the...$103.52$141.80 -
ProX Piston Kits are comprehensive coming complete with: Piston / Ring Kit / Wrist Pin / Cir Clips. ProX also offers oversized piston options in order to follow manufaturer Piston to Cylinder Wall clearances. ProX pistons are precision machined on the...$191.21$212.46 -
ProX Piston Kits are comprehensive coming complete with: Piston / Ring Kit / Wrist Pin / Cir Clips. ProX also offers oversized piston options in order to follow manufaturer Piston to Cylinder Wall clearances. ProX pistons are precision machined on the...$184.01 -
ProX Piston Kits are comprehensive coming complete with: Piston / Ring Kit / Wrist Pin / Cir Clips. ProX also offers oversized piston options in order to follow manufaturer Piston to Cylinder Wall clearances. ProX pistons are precision machined on the...$187.65$208.50 -
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,...$1,540.95 -
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 there are no manifold or frame fitment issues. The S&S...$1,345.95 -
Breather conversion kit for big twin engines updates earlier S&S air cleaner kits for 1993-1999 big twins to the latest breather hardware. Instead of o-rings, banjo fittings are sealed with durable silicon coated washers.$51.95 -
