S&S CYCLE Big Bore Piston Kit

S&S CYCLE Big Bore Piston Kit (128") Upgrade your street Harley with the S&S CYCLE Big Bore Piston Kit for a 128" displacement build. This piston kit is designed to deliver strong performance with quality components engineered for reliable fit and function. What’s Included Set of pistons Compression rings Wristpins Clip set Key Features Big Bore style for increased displacement Dished piston head shape Bore oversize: +0.010" Approximate compression ratios calculated using correct cylinder length per S&S specifications Specifications Displacement: 128" Stroke Length: 4.500" Piston Head Shape: Dished Bore Size: 4.250" Bore Oversize: +0.010" Riding Style: Street Units: Kit Weight: 3.15 lbs | Dimensions: 9.75" x 7.5" x 4.75"