S&S, M8 128" Piston Kit. Std For Harley-Davidson

Std. Piston kit includes pistons, rings, wristpins and clips. Big bore 4.250" cylinders are required, OEM cylinders can not be bored to 4.250". 117" to 128" pistons come with 1.0805" deck height and are compatible with OEM 4.500" stroke. Note: See S&S 574121 or 547122 for 4.250" big bore cylinders only. Fits: 18-19 Softail; 17-19 Touring Units: KIT