S&S EVOLUTION BIG TWIN SUPER STOCK CYLINDER HEADS

Exactly the same cylinder heads as S&S uses in their complete 1,575cc/96CI V-Series engines. Feature 2.0" diameter intake valves and 1.605" diameter exhaust valves and give increased flow compared to stock Harley heads. These cylinder heads can be used with domed pistons in 3 1/2" bore or 3 5/8" Big Bore. Valve springs are compatible with up to .650" lift cams. Heads come with valves and valve springs installed and are sold in sets for front and rear.