KB928C020 Performance, 3-5/8 big bore forged piston kit. +.020"

Designed for high-performance 3-5/8 inch big bore applications, this KB Performance forged piston kit fits 1948 to 1984 Panhead and Shovelhead engines. These +.020 inch oversize pistons are built to work with a variety of stroker flywheels and cylinder lengths, providing a compression ratio of 8.50:1 with a standard stroke or up to 9.38:1 with a 4.750 inch stroke. The 4032 alloy forging provides the structural integrity needed for aggressive builds while maintaining a low expansion rate. This kit is sold as a set, including offset wrist pins, rings, and retaining clips. Because the pistons feature offset pins, they must be installed in the correct front-to-rear orientation. Ensure you provide the necessary .001 inch extra wall clearance required for forged pistons to prevent scuffing during high-temperature operation.