These 3-5/8" bore forged pistons are designed for use in S&S big bore Hot Set Up Kits® for 5" stroke for Harley-Davidson® Evolution® big twin engines, and S&S 3-5/8" bore engines with S&S Super Stock® cylinder heads. These are also used as a lower compression piston in 3-13/16", 4-5/16", and 5" stroke engines for Harley-Davidson® Sportster® models equipped with S&S Super Stock® cylinder heads. The 92-1080 series pistons are clearanced for 5" stroke big twin engines with small (8-1/4") diameter flywheels. +.060 oversize.
