Jet boat with B impeller. Flat bottom or hydro bracket racer. Likes tunnel ram. Bracket racing or limited street use. Strong top end power. 10.5:1 compression, 3500+ stall. Radical racy idle. 3,000-6800 RPM Operating Range 253/253 Duration at .050". 110 Degree Lobe Separation Angle. 0.585"/0.585" Valve Lift CL Kits include a camshaft, a set of lifters, instructions and assembly lubricant. Great high RPM power - Best with aftermarket torque converters and at least 9.5:1 compression. Easy on valvetrain parts - Can be used with mild ratio rocker arms and traditional performance valve springs. Fits Ford 429 and 460 Made in USA