The S&S 500 cam is a bolt-in that cam set that provides excellent torque with stock or ported heads. Great for modified engines up to 89 inch displacement and 9.0:1 to 10.5:1 compression ratio and will work in 89 to 100 inch engines with less than 9.5:1 compression. Normal clearancing checks recommended. Will work with solid or hydraulic tappets, requires cam lobe clearancing when used in stock crankcases. 2000 - 6000 rpm. Fits engines in 1986-1990 Harley-Davidson Sportster models. S&S Part #: 33-5081