106-5556 | 31/2" Bore Forged Stroker Piston Kits For Stock Heads Or S&S Performance Replacement Heads - +.020" Patriotic Crystal clear outer jacket offers

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106-5556 | 31/2" Bore Forged Stroker Piston Kits For Stock Heads Or S&S Performance Replacement Heads - +.020" Patriotic Crystal clear outer jacket offersS&S Cycle 106 5556 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" +. 020" bore. Install Instructions Download