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A popular, easy way to advance or retard the cam is with Mr. Gasket's bushing kit. The bushings can be used to advance the cam for increased low-end torque and mid-range horsepower. They can also reduce excessive low-end torque and increase top-end horsepower by retarding the cam. The kit includes four offset bushings and a 0° bushing, so stock timing can be used again, if desired. Cam sprocket dowel pin hole must be drilled .406", (13/32") diameter. Chevrolet 283-454 cu. in., all Chrysler B-Block