These forged 3-1/2" bore stroker pistons for 1984-'99 HD® Evolution® big twin engines are required for the S&S 89" stock bore stroker kits, which include S&S 4-5/8" stroke flywheels. Pistons are designed to be used with stock cylinder heads or with S&S Performance Replacement heads. Low silicon forged material and advanced S&S piston skirt design result in high strengh and low noise. 3-1/2" standard bore.
Piston kits include set of pistons, rings, wristpins, and clips. Recommended cast piston fitment: Close: 0.0008” – 0.0013” Loose: 0.0020” – 0.0025”