106-5777 3-7/16" forged stroker piston kit. +.040"

This S&S forged stroker piston kit is a high-performance upgrade for 1941 to 1984 Big Twin engines running stroker flywheels. These .040 inch oversize pistons are designed for 3-7/16 inch or 3-1/2 inch cylinders and offer a range of compression ratios depending on the stroke length, reaching up to 10.8:1 with a 4-3/4 inch stroke. The advanced alloy and skirt profiles are engineered for low noise and a long engine life, making them a reliable choice for custom stroker builds. Sold as a set, the kit includes wrist pins, clips, and rings. We recommend that a qualified technician handles the installation to ensure all engine components are properly suited for the build.