Engine Kits

Comp Cams Thumpr™ Retro-Fit Hydraulic Roller Camshafts for SB Chevy

The Muscle-car sound is back and nastier than ever, Thumpr™ Cams deliver incredible exhaust lope and impressive performance for your Small Block Chevy

Let’s face it, few things serve to grab our attention at a car show or cruise night more than a car with a thumping, high performance idle. In fact, one of the most frequent questions fielded when customers call Northern Auto Parts or the CAM HELP® tech line is “what camshaft will give my car that mean-sounding idle?” In Comps ongoing quest to provide customers with the performance that they demand, the COMP Cams® engineering team proudly introduces the Thumpr™ series of camshafts.

The Thumpr™ Camshafts are a new series of retro-fit hydraulic roller camshafts designed for use in 1955-1998 262-400 cubic inch Small Block Chevrolet engines that were originally equipped with flat tappet camshafts. The reason that the new Thumpr™ Camshafts have such an aggressive exhaust note is that the lobe profiles and grind characteristics chosen by the COMP Cams® engineers produce 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 cams without negatively impacting the power output or streetability of the engine.

Thumpr™ Camshafts are available in three different grind profiles, each one of which will produce a rough, racy exhaust note and impressive amounts of horsepower and torque at a different rpm range. Their cutting-edge hydraulic roller design means that they will deliver a substantial power increase over an identical hydraulic flat tappet grind without sacrificing reliability or ease of maintenance. So look no further than the Thumpr™ line of camshafts - engineered to deliver that much sought-after ”thumping” idle quality to Small Block Chevy owners everywhere.


Thumpr™ Small Block Chevy Retro-Fit Hyd. Roller Cams

  • Retro-fit hydraulic roller design will fit all factory flat tappet equipped Small Block Chevys
  • 3 grinds to fit all of your cruising and street performance needs
  • Long exhaust duration and other grind characteristics produce a powerful, hard-hitting exhaust note
  • Excellent horsepower gains and broad torque curve deliver real seat of the pants performance
  • Designed for use with the latest in valve train component advancements such as Beehive™ Valve Springs, Pro Magnum™ Roller Rockers and Magnum Pushrods

This product is in the following categories:




Part #: 12-600-8

HYDRAULIC ROLLER: High performance street, stock converter ok, best with 2000+ converter and gears, choppy idle. Chevrolet 262-400 c.i 8cyl. 1955-1998. 2200 - 5900 RPM Change.
Price: $293.99

Part #: 12-601-8

Hydraulic Roller-(Mutha' Thumpr™) High performance street/strip, needs 9:1 CR, 2500+ stall, intake, gears and headers, rough idle. 2200-5900 RPM Range
Price: $293.99

Part #: 12-602-8

Hydraulic Roller-(Big Mutha' Thumpr™) Street/strip needs 9.5:1 CR, 2800+ stall, intake, gears and headers, very rough idle. 2500-6200 RPM Range.
Price: $293.99

Part #: 4917

Comp Cams Chevy Oil Restrictors .055
Price: $12.22