S&S CYCLE - CYLINDERS AND PISTONS - 80" - LOW COMPRESSIONCylinders and Pistons 80" Low Compression Highlights Intended 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