Replacement for HP 340 and 360 4 BBL motors. Noticeable idle in 318. Works with 3.23-3.55 gear, dual exhaust and 9:1 compression. 1,500-5,500 RPM Operating Range 218/218 Duration at .050". 110 Degree Lobe Separation Angle. 0.454"/0.454" Valve Lift CL Kits include a camshaft, a set of lifters, instructions and assembly lubricant. High Energy grinds are a good blend of efficiency and performance: ideal for performance street rebuilds. Fit type: Vehicle Specific