Xtreme 4x4 230/234 Hydraulic Roller Cam for OE Roller SBC Good top end. Needs headers, lower gears and 2500+ stall. 1,800-5,800 RPM Operating Range 230/234 Duration at .050". 111 Degree Lobe Separation Angle 0.474"/0.474" Valve Lift Designed for use with common restrictive factory exhaust systems, including OEM exhaust manifolds. Improved throttle response and increased low and mid-range RPM horsepower for towing and off-road. Fits Chevrolet GEN 1 305/350 Small Blocks originally equipped with roller camshafts. Made in USA