S&S 3-7/16" Bore Cylinder and Stroker Piston Kit - Big Twin

The S&S 3-7/16" Bore Cylinder and Stroker Piston Kit gives you a precise, durable fit for a strong, healthy top end. It is made from cast iron.

Fits Harley-Davidson Touring (1966-1984), FXR (1982-1983), FX Big Twin (1971-1984) and Vintage (1966-1980) models. Check the fitment chart below to confirm your exact year and model.

• Cylinder and piston kit can be used to build 84", 86" or 88" stroker engines, or to replace the cylinders and piston in an engine with an existing S&S® stock bore stroker kit
• Can be used in engines with 4-1/2", 4-5/8" or 4-3/4" stroke flywheels
• 4-1/2" Stroke - 84" - 8.4:1 Compression 4-5/8", Stroke - 86" - 9.4:1 Compression 4-3/4", Stroke - 88" - 10.8:1 Compression
• Includes 3.4375" bore high tensile cast iron cylinders, 3.4375" bore forged pistons with rings and wristpins, head gaskets, S&S stainless steel head bolts with washers, base nuts and base gaskets
• Made in the U.S.A.