Competition Cams 12-235-2 Xtreme 4X4X4254H-11 Camshaft for Small Block Chevy Strong low end and mid-range torque, good idle. 1,000-5,200 RPM Operating Range 210/218 Duration at .050". 111 Degree Lobe Separation Angle 0.447"/0.462" 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 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. Made in USA