Forged 3 5/8" Bore Piston Kits for 1984-'99 HD® Big Twins 88", 93", & 98" Stock Style HeadsThese 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.
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Forged 3 5/8" Bore Piston Kits for 1984-'99 HD® Big Twins 88", 93", & 98" Stock Style Heads