COMP Cams 07-503-8 Xtreme Energy 224/230 Hydraulic Roller Cam for GM LT1/LT4 Best cam for modified LT1, better exhaust and 2000+ converter. Requires custom tuning. 1,800-5,800 RPM Operating Range 224/230 Duration at .050". 112 Degree Lobe Separation Angle .503"/.510" Valve Lift Excellent performance in street carbureted applications. Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve. More vacuum allows an increase in duration for improved performance and assists power brakes. Best performance with aftermarket intake manifolds, headers and lower gear ratios. Fits Chevrolet LT1/LT4 350