Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.
Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572
High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
Chevrolet GEN IV 396-454 Big Block Engines Originally Equipped with Flat Tappet Camshafts
Mutha' Thumpr 235/249 Hydraulic Roller Cam for Chevrolet Big Block 396-454
M-Thmpr 235/249 H-Roller Cam BBC 396-454
COMP Cams Camshaft CB 291T HR-107 MT Th
CAMSHAFT, CB 291T HR-107 MT TH UMPR
MT 235/249 HRlrBBC
Engine Camshaft
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