New BBC retro-fit hydraulic roller cams provide unmatched musclecar sound & power. When the Big Block Chevrolet engine debuted in 1965, it revolutionized the high performance world. The new COMP Cams® Thumpr™ Camshafts take the original Mark IV engine one step further with a line of three retro-fit hydraulic roller camshafts that not only delivers excellent power and torque gains, but includes another important feature – true high performance camshaft sound. For those folks who desire not only the performance but the sound of power, COMP Cams® Thumpr™ Camshafts are the perfect component for the job.

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