3-5/8" Bore Standard Compression Piston Kit for Super Stock® Heads These forged pistons are designed for use in S&S® Big Bore Hot Set Up Kits® for HD® Evolution® big twin engines, and S&S® 3-5/8" bore engines with S&S® Super Stock® cylinder heads and 4-1/4�, 4-1/2" and 4-5/8" stroke engines with stock diameter (8-1/2") flywheels.
3-5/8" bore, standard size.
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