What other parts are needed to install this camshaft?

This camshaft requires several supporting modifications for optimal performance. You'll need an aftermarket torque converter with a 2800+ RPM stall speed, an appropriate intake manifold, lower gear ratios, and headers. Additionally, a vacuum canister, pump, or hydroboost system is necessary if your vehicle uses power brakes.

What kind of idle can I expect with this camshaft?

This is a 'Thumpr' camshaft, meaning it's designed to produce a very aggressive, rough idle that sounds like a race car. The early intake valve opening and long exhaust duration create significant valve overlap, contributing to this distinctive sound.

Is this camshaft street legal in California?

No, this camshaft is not CARB approved and cannot be legally shipped to or installed in California.

COMP Cams Camshaft CBVI 299Th R7 Thumper 01-602-8

Name: COMP Cams Camshaft CBVI 299Th R7 Thumper
Brand: COMP Cams
Price: 610.12 USD
Availability: InStock

COMP Cams Camshaft CBVI 299Th R7 Thumper

$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 Camshaft CBVI 299Th R7 Thumper BMT 243/257 HRlrBBC6. Get an aggressive idle and improved power for your Big Block.

Key Features

Fits 1996-2000 Chevrolet and GMC C/K/G/P series trucks and vans with Big Block GEN VI engines.
Big Mutha' Thumpr camshaft series for an aggressive, hard-hitting idle.
Hydraulic roller design for improved performance and durability.
Features a 243° intake duration and 257° exhaust duration.
Designed for street/strip applications requiring 9.5:1 compression.
Requires a 2800+ RPM stall torque converter, intake, gears, and headers.

⚠️ 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

When you're looking to give your Chevrolet Big Block GEN VI engine that unmistakable, aggressive idle and a serious boost in performance, the COMP Cams Big Mutha' Thumpr camshaft is a popular choice. This camshaft is designed to create that signature race car sound at idle, thanks to its early intake valve opening and extended exhaust duration. It's built to deliver noticeable horsepower gains and a broader torque curve, making it a great option for muscle cars and street rods. This particular camshaft, the CBVI 299Th R7, is a hydraulic roller camshaft specifically for Chevrolet Big Block GEN VI engines, like those found in 1996-1999 C2500 Suburbans and K2500s, or C3500 trucks.

To really make this camshaft shine and ensure your drivetrain stays in the powerband, COMP Cams recommends using an aftermarket torque converter with a stall speed of 2800 RPM or higher, along with lower gear ratios. You'll also want to make sure your engine has at least 9.5:1 compression and is set up with an intake, headers, and appropriate gearing. Because this camshaft design typically reduces vacuum at idle, you'll need to plan for a vacuum canister, pump, or hydroboost system if your vehicle relies on power brakes. The extended duration and overlap create a very rough idle, which is part of its aggressive character.

This camshaft is a significant upgrade for performance-minded builders. It's important to note that this camshaft is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for specific details regarding required components and procedures.