31/2" Bore Forged Stroker Piston Kits For Stock Heads Or S&S Performance Replacement Heads - +.010"

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" +.010" bore.