Pistons have a compression of 9:1 and includes rings. 1941-1977 Harley-Davidson FL. FITS THE FOLLOWING BIKE APPLICATIONS. Manufacturer Part Number: K1607. Manufacturer: Wiseco.
Packaging is excellent! Piston quality is far superior than that of OEM HD and other manufacturers. I put these in my OEM original paint 1974 HD FLH. The machine shop owner I took these too was even impressed with the quality of the pistons. Honed to fit .020 over, installed easily with excellent instructions on direction pistons must go according to cut for the valves. The pistons are also marked.