106-5781 3-7/16" forged stroker piston kit. +.080"

For the ultimate overbore on a vintage stroker, this S&S forged piston kit provides +.080 over sizing for 1941 to 1984 Big Twin engines. These pistons are built for Knucklehead, Panhead, and Shovelhead motors equipped with stroker flywheels and stock length cylinders. The 50cc dome volume allows for high-performance compression ratios, reaching up to 10.8:1 depending on your specific flywheel stroke. S&S uses a high-tech alloy and a refined skirt profile to ensure these pistons run quiet and last for the long haul. This kit is sold as a set and includes everything needed for the top-end assembly, including the forged pistons, wrist pins, retaining clips, and high-quality piston rings. It is a heavy-duty solution for serious engine builders.