COMP Cams is bringing back the musclecar sound—and it's nastier than ever! Few things grab our attention at a car show or cruise night more than a car with a thumping high performance idle. In an ongoing quest to provide you with the performance and sound you demand, COMP Cams' engineering team proudly introduces the Thumpr retrofit hydraulic roller camshafts. They are a series of camshafts designed for use in engines that were originally equipped with flat tappet camshafts. The lobe profile and grind characteristics use a combination of an early exhaust valve opening, a long exhaust duration, and a generous amount of intake and exhaust overlap to maximize the rough-idling characteristics of the cams. They give you a seriously aggressive exhaust note without negatively impacting the power output or streetability of the engine. Thumpr camshafts are available in three different grind profiles. Each one will produce a rough, racy exhaust note and impressive amounts of horsepower and torque within a different rpm range. COMP Cams Thumpr Series camshafts feature a cutting-edge hydraulic roller design that delivers a substantial power increase over identical hydraulic flat tappet grinds—without sacrificing reliability or ease of maintenance.

More From This Category

COMP Cams Stage 2 LST Master Cam Kit for Manual LS3 Corvette/Camaro w/ Stock Pistons

COMP Cams Stage 2 LST Master Cam Kit for Manual LS3 Corvette/Camaro w/ Stock Pistons

$3,154.95

COMP Cams Camshaft, Xtreme Energy, Hydraulic Flat Cam, Advertised Duration 254/262, Lift .477/.493, AMC 199-258/4.0L, Each

COMP Cams Camshaft, Xtreme Energy, Hydraulic Flat Cam, Advertised Duration 254/262, Lift .477/.493, AMC 199-258/4.0L, Each

$627.29

COMP Cams Cam / Lifters / Valvetrain Magnum Solid Roller Advertised Duration 308 / 308 Lift .652

COMP Cams Cam / Lifters / Valvetrain Magnum Solid Roller Advertised Duration 308 / 308 Lift .652

$3,141.99

COMP Cams Cam / Lifters / Valvetrain Big Mutha' Thumpr Hydraulic Flat Advertised Duration 295 /

COMP Cams Cam / Lifters / Valvetrain Big Mutha' Thumpr Hydraulic Flat Advertised Duration 295 /

$1,509.44

COMP Cams Cam/Lifters/Timing, Magnum, Hydraulic Flat, Advertised Duration 280/280, Lift .480/.480, For Pontiac 265-455, Kit

COMP Cams Cam/Lifters/Timing, Magnum, Hydraulic Flat, Advertised Duration 280/280, Lift .480/.480, For Pontiac 265-455, Kit

$892.94

Crow Cams Camshaft, LS Cam, Adv. Duration 301/321, Valve Lift 0.614/0.610

Crow Cams Camshaft, LS Cam, Adv. Duration 301/321, Valve Lift 0.614/0.610

$558.81