Competition Cams 12-423-8 Xtreme Energy XE276HR-10 Camshaft for Small Block Chevy High performance street machines, 2000+ stall, gears, choppy idle. 1,900-5,600 RPM Operating Range 224/230 Duration at .050". 110 Degree Lobe Separation Angle .502"/.510" Valve Lift Excellent performance in street carbureted applications. More vacuum allows an increase in duration for improved performance and assists power brakes. Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve. Best performance with aftermarket intake manifolds, headers and lower gear ratios. 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