These forged 3-7/8" bore stroker pistons for 1999-'16 HD® big twin are required for the S&S 106" stock bore stroker kit with 4-1/2" stroke flywheels. They are compatible with stock or S&S® Super Stock® cylinder heads. Stock 88" cylinders may be bored to fit these pistons, or S&S has replacement cylinders available. Standard bore.
S&S 3 7/8" pistons for 95" kits are machined to such close tolerances that it is not necessary to measure the piston. Additionally, the low friction coating on the piston skirt makes taking measurements very difficult. Therefore, hone cylinders to nominal diameter +/- 0.0001" for correct clearance.