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Camshaft profiles are very important to a good working engine and their center lines can be very crucial. Center lines of the camshaft can not only impact your power curve if proper precautions are not taken catastrophic failure could occur. If you have the cam too far advanced you take the chance of having the Exhaust valves hitting the piston but tends to build more low end. Retarding the cam will tend to give you more top end power but also tightens your piston to intake valve clearance. Changing the center line of your camshaft should not be attempted unless your a trained professional.