COMP Cams K11-600-4 Flat Tappet Hyd. Complete Thumpr Camshaft Kit for Chevrolet BIg Block 396-454 EnginesThumpr Cams Musclecar sound is back and nastier than ever; Thumpr Cams deliver incredible exhaust lope and impressive performance Thumpr Camshafts are a new series of retro fit hydraulic roller and hydraulic flat tappet cams designed for use in Small & Big Block Chevy, Ford 351 Windsor and Small Block Chrysler engines. The aggressive exhaust note of a Thumpr cams comes from a combination of early exhaust valve opening, long exhaust duration and a
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COMP Cams K11-600-4 Flat Tappet Hyd. Complete Thumpr Camshaft Kit for Chevrolet BIg Block 396-454 Engines