S&S Cycle 84-99 BT Forged 3 5/8in Bore .010in Piston Kit
These forged, 3-5/8" big bore flat topped pistons are used in S&S® Sidewinder® kits and Hot Set Up Kits® for HD® Evolution® big twins with stock cylinder heads and 4-1/4" and 4-1/2"stroke engines with stock diameter (8-1/2") flywheels and 4-3/4" stroke engines with 8-1/4" diameter flywheels. 3-5/8" bore.
+.010" 3-5/8", 10.2:1, 96" Evo
