What kind of idle can I expect with this camshaft?

This is the Big Mutha' Thumpr camshaft, and it's known for producing a very rough, aggressive idle. It's designed for street/strip use where a noticeable idle sound is desired.

What other modifications are recommended when installing this camshaft?

For optimal performance, COMP Cams recommends pairing this camshaft with at least 9.5:1 compression, a torque converter rated for 2800+ RPM stall, and ensuring you have suitable intake, gearing, and headers.

Is this camshaft compatible with all Chevrolet Big Block engines?

This camshaft is specifically designed for Chevrolet Big Block engines originally equipped with flat tappet camshafts. It fits a wide range of models from 1967 through 1993, but always verify fitment for your specific engine configuration.

COMP Cams Hydraulic Roller Camshaft 11-602-8

Name: COMP Cams Camshaft CB 299T HR-107 BMT T
Brand: COMP Cams
Price: 610.12 USD
Availability: InStock

COMP Cams Camshaft CB 299T HR-107 BMT T

$610.12

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams Big Mutha' Thumpr camshaft for Chevrolet Big Block 396-454 engines. Hydraulic roller design with a very rough idle for street/strip use.

Key Features

Fits Chevrolet Big Block 396-454 engines originally equipped with flat tappet camshafts.
Hydraulic roller camshaft design for improved performance and durability.
Features a 243 degree intake and 257 degree exhaust duration.
Has a 107 degree lobe separation angle (HR-107).
Requires 9.5:1 compression ratio or higher.
Needs a torque converter with a 2800+ RPM stall speed.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

This COMP Cams Big Mutha' Thumpr camshaft features a 243/257 degree duration split and a hydraulic roller design, making it a serious upgrade for Chevrolet Big Block engines originally equipped with flat tappet camshafts. It's built for street/strip applications where a noticeable, aggressive idle is part of the appeal. To get the most out of this camshaft, you'll want to pair it with at least 9.5:1 compression, a torque converter with a 2800+ RPM stall speed, and ensure your intake, gearing, and exhaust headers are up to the task.

The HR-107 lobe separation angle contributes to the camshaft's aggressive nature and the very rough idle that many enthusiasts seek for high-performance builds. This camshaft is designed to work with Chevrolet Big Block engines like those found in models such as the 1967-1975 Chevrolet Bel Air, 1967-1972 Chevrolet Camaro, and 1967-1974 Chevrolet Corvette, among many others. It's a substantial change from a stock camshaft, so be prepared for the sound and performance characteristics that come with it.

When installing this camshaft, remember it's a significant performance modification. Ensure your valvetrain components are compatible and consider consulting the manufacturer's detailed installation instructions to achieve optimal results and longevity. This camshaft is not CARB approved and cannot be shipped to California.