Cylinders and Pistons - 80" - Low Compression - 91-9024Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8: 1. Compatible with stock or S&S cylinder heads. Includes S&S 3. 5" bore high tensile cast iron cylinders, 3. 5" bore forged standard compression pistons for 80" (4. 25" stroke) engines with rings and wristpins, head gaskets, S&S stainless steel bolts with washers, base nuts and base gaskets. Made in the U. S. A..