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Headers, dual exhaust, larger than stock carburetor, performance manifold and increased compression (9.5:1 to 10.5:1) are required.Mild porting and larger valves will improve performance.All of our numbered series are named for their lift rates or lobe acceleration.The lower number "220" indicates a smoother lift rate where the "420" number is a faster lift rate profile.Crower has been designing and grinding hot-street and cutting-edge full race profiles for over 50 years.Camshafts are the most critical part of your engine’s performance.Camshafts use a combination of separation angles, lift, duration and lobe acceleration/ramp rates to create what is called a cam profile.The profile you choose determines where your maximum horsepower and torque will occur. To get the best performance for your application, the camshaft profile must match your head and valve train components.
Modifications that should accompany installation of these cams include small diameter tube headers, low restriction dual exhaust, aftermarket manifold, increased cfm carburetor and reworked or performance ignition.
Increased compression (9.5:1) is recommended for maximum output.
Aftermarket torque converter with slightly higher stall speed is recommended because stock factory converters do not allow the engine to provide adequate idle speed and off idle performance.
Performance Level 4Level 4 camshafts are designed for heavily modified engines.
These camshaft have a definite lope at idle and are best suited for dual purpose hot street/drag strip, hot marine or oval track applications.
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These camshafts work well with four-speed manual transmission.