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 Camshaft, High Energy, Hydraulic Flat, Advertised Duration 240/248, Lift .455/.455, For Pontiac 151 Iron Duke, Each

COMP Cams Camshaft, High Energy, Hydraulic Flat, Advertised Duration 240/248, Lift .455/.455, For Pontiac 151 Iron Duke, Each

$623.21

View
COMP Cams Camshaft, Open Wheel Modified Traction Control, Solid Roller, Advertised Duration 289/298, Lift .709/.694, For Chevrolet Small Block, Each

COMP Cams Camshaft, Open Wheel Modified Traction Control, Solid Roller, Advertised Duration 289/298, Lift .709/.694, For Chevrolet Small Block, Each

$893.40

View
COMP Cams Cam / Lifters / Valvetrain Hydraulic Flat Tappet Advertised Duration 255 / 275 Lift .4

COMP Cams Cam / Lifters / Valvetrain Hydraulic Flat Tappet Advertised Duration 255 / 275 Lift .4

$888.92

View
COMP Cams Camshaft, Hydraulic Flat Tappet, Advertised Duration 319/320, Lift .390/.410, For Chevrolet, Small Block, Each

COMP Cams Camshaft, Hydraulic Flat Tappet, Advertised Duration 319/320, Lift .390/.410, For Chevrolet, Small Block, Each

$411.20

View
Edelbrock Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 309/314, Lift .464/.470, For Chevrolet, Small Black, Kit

Edelbrock Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 309/314, Lift .464/.470, For Chevrolet, Small Black, Kit

$383.87

View
COMP Cams Camshaft, Magnum, Hydraulic Roller Cam, Advertised Duration 281/281, Lift 0.512/0.512, For Ford 5.0L, Each

COMP Cams Camshaft, Magnum, Hydraulic Roller Cam, Advertised Duration 281/281, Lift 0.512/0.512, For Ford 5.0L, Each

$897.10

View