The S&S 600 is the standard cam included in 4 inch bore S&S engines. For engines larger than 89 inches with 9.5:1 to 10.5:1 compression ratio and S&S heads. Great addition to a S&S 103 inch Sidewinder kit. Requires crankcase clearancing and spring spacing. 3,500 - 6,500 rpm. Will work with either solid or hydraulic tappets. Fits engines in 1986-1990 Harley-Davidson Sportster models. S&S Part #: 33-5125