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

Crow Cams Camshaft, Holden V8 253-308 Solid Roller, Adv. Duration 290/294, Valve Lift 0.666/0.666

Crow Cams Camshaft, Holden V8 253-308 Solid Roller, Adv. Duration 290/294, Valve Lift 0.666/0.666

$933.67

COMP Cams Camshaft, XE Computer Controlled, Hydraulic Flat, Advertised Duration 249/260, Lift .434/.444, For Chevrolet Small Block, Each

COMP Cams Camshaft, XE Computer Controlled, Hydraulic Flat, Advertised Duration 249/260, Lift .434/.444, For Chevrolet Small Block, Each

$566.01

COMP Cams Camshaft, 4-Pattern, Hydraulic Roller, Advertised Duration 271 OB/269 IB Int, 283 OB/281 IB Exh, .603 OB/.600 IB Int. Lift, .603 OB/.600 I

COMP Cams Camshaft, 4-Pattern, Hydraulic Roller, Advertised Duration 271 OB/269 IB Int, 283 OB/281 IB Exh, .603 OB/.600 IB Int. Lift, .603 OB/.600 I

$1,301.82

COMP Cams Camshaft, Magnum, Solid Flat, Advertised Duration 294/294, Lift .525/.525, For Chrysler 383-440, Each

COMP Cams Camshaft, Magnum, Solid Flat, Advertised Duration 294/294, Lift .525/.525, For Chrysler 383-440, Each

$567.17

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

$3,053.34

COMP Cams Cam / Lifters / Valvetrain Xtreme Energy Hydraulic Flat Cam Advertised Duration 262 /

COMP Cams Cam / Lifters / Valvetrain Xtreme Energy Hydraulic Flat Cam Advertised Duration 262 /

$1,066.49