Camshaft - Big Mutha' Thumpr - Hydraulic Roller - Lift 0.570 / 0.554 in - Duration 299 / 319 - 107 LSA - 2300 / 6100 RPM - Big Block Chevy - Each

COMP Cams Camshaft CB 299T HR-107 BMT T

Big Mutha' Thumpr 243/257 Hydraulic Roller Cam

Additional Information

Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle.

Application Summary

Chevrolet GEN IV 396-454 Big Block Engines Originally Equipped with Flat Tappet Camshafts

Part Type

Engine Camshaft

Product Overview

*Thumpr Camshafts*
• Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods
• Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note
• Best with aftermarket converters and more rear gear

These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.

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Product Details

Product Downloads

#	Document Type	Download
1.	Catalog

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Camshaft, Hydraulic Roller Tappet, Advertised Duration 299/319, Lift .570/.554, Chevy, Big Block, Each

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.