A Sweet Cam for Small Blocks

Thumpr camshafts are a new series of retrofit hydraulic roller camshafts designed for use in '55-'98 262- to 400ci small-block Chevrolet engines that were originally equipped with flat-tappet camshafts. Thumpr cams help produce an aggressive exhaust note, thanks to lobe profiles and grind characteristics chosen by the Comp Cams engineers. The results are caused by a combination of early exhaust valve opening, long exhaust duration, and a generous amount of intake and exhaust overlap to maximize the rough-idling characteristics of the cam without negatively impacting the power output or streetability of the engine. Available in three different grind profiles, each one of which is said to produce a rough, racy exhaust note and impressive amounts of horsepower and torque at different rpm ranges.

Info: 800/999-0853, www.compcams.com



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