This 4-1/8" bore wrinkle black cylinder set is 5.013" in length. It is for 124" V-Series Engines for 1984-'99 big twins.
S&S 4-1/8" pistons are machined to such close tolerances that it is not necessary to measure the piston. Additionally, the low friction coating on the piston skirt of early production pistons. Cylinder sets without pistons are bored slightly under nominal size and are not honed. Not legal for sale or use on CA or EPA pollution controlled motorcycles