COMP Cams SK31-238-3 Xtreme Energy 218/224 Hydraulic Flat Cam SK-Kit for Ford 221-302 Excellent response, good mid-range, stock converter, 3.23-4.10 gear. 1,300-5,600 RPM Operating Range 218/224 Duration at .050". 110 Degree Lobe Separation Angle. 0.493"/0.500" Valve Lift SK Kits include a camshaft, a set of lifters, assembly lubricant, a timing set and instructions. Excellent performance in street carbureted applications. 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 Ford 221-302 w/ OE Flat Tappet Cams Made in USA