S&S +.010in. Forged 89ci Stroker Pistons. Fits Evolution Big Twin 1984-1999 with S&S 4-5/8in. Stroker Flywheel

Description

These forged 3-1/2in. bore stroker pistons for 1984-’99 HD® Evolution® big twin engines are required for the S&S 89in. 4-5/8in. stroker flywheels. Pistons are designed to be used with stock cylinder heads or with S&S Performance Replacement heads # SS106-6064. Low silicon forged material and advanced S&S piston skirt design result in high strengh and low noise. 3-1/2in. +.010in. bore.

Tech Tips:-

* Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufacturers