S&S® forged, 3-1/2" bore replacement pistons for 1984-'99 HD® 80" big twins With S&S® Super Stock Cylinder Heads. 4-1/4" stroke. 10:1 compression. Standard bore size.

These forged pistons are designed as an intermediate compression piston for engines with S&S Super Stock cylinder heads. These pistons can be used to increase the compression of S&S Sidewinder kits for HD Evolution engines and in S&S engines with Super...

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...

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...

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...

S&S Power Package - 128 CI Oil Cooled, Gear Drive, w/ Non-Highlighted Fins and Chrome Pushrod Tubes, Wrinkle Black, 2017+ M8 114 in. Models

S&S Power Package - 128 CI Oil Cooled, Chain Drive, w/ Non-Highlighted Fins and Chrome Pushrod Tubes, Wrinkle Black, 2017-up M8 114 in. Models

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...

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...

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...

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...

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...