What kind of idle can I expect with this camshaft?

This COMP Cams Mutha' Thumpr camshaft is designed for high performance and will result in a rough idle. This is a common characteristic of cams that prioritize airflow and power for street/strip use.

Does this camshaft come with any other parts, like lifters or valve springs?

This product listing is for the camshaft only. You will need to source compatible lifters, valve springs, pushrods, and other valvetrain components separately to complete the installation.

How can I tell if my Chevrolet Small Block has a flat tappet or roller camshaft?

To determine if your engine has a flat tappet or roller camshaft, you will typically need to remove the intake manifold or timing cover. Factory roller camshafts were gradually introduced in the mid-80s, with many trucks and SUVs retaining flat tappet cams into the mid-90s.

COMP Cams Hydraulic Flat Cam 12-601-4 - Chevrolet Small Bloc

Name: COMP Cams Camshaft CS 287T H-107 MT Thu
Brand: COMP Cams
Price: 320.45 USD
Availability: InStock

COMP Cams Camshaft CS 287T H-107 MT Thu

$320.45

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 Mutha' Thumpr camshaft for Chevrolet Small Block engines. High performance street/strip hydraulic flat tappet design.

Key Features

Fits Chevrolet GEN 1 Small Blocks including 262-400 cubic inch engines.
High performance street/strip camshaft.
Hydraulic flat tappet design.
Requires 9:1 compression, 2500+ stall converter, intake, gears, and headers.
Results in a rough idle characteristic of performance cams.
Does not fit LT1/LT4 or factory roller small blocks from 1985 and newer.

⚠️ 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 get more out of your Chevrolet Small Block engine, this COMP Cams Mutha' Thumpr camshaft is a solid option. You'll receive the camshaft itself, ready to be installed in your engine. This camshaft is designed for high-performance street and strip applications, meaning it's built to handle demanding driving conditions and provide a noticeable boost in power. It's a hydraulic flat tappet design, which is a common and well-understood type of valvetrain for these engines.

To get the most out of this camshaft, it requires a few supporting modifications. You'll need at least 9:1 compression to effectively utilize its performance potential. A torque converter with a 2500+ stall speed is also recommended to keep the engine from bogging down at lower RPMs, especially during acceleration. Additionally, you'll want to ensure you have a good intake manifold, appropriate gearing in your rear end, and headers to help the engine breathe freely. Be aware that this camshaft will result in a rough idle, which is characteristic of performance cams designed for increased airflow and power.

This camshaft fits a wide range of Chevrolet Small Block engines, including popular displacements like the 262 through 400 cubic inches. It's important to verify your engine uses a flat tappet valvetrain, as it does not fit factory roller camshaft setups found in some later model engines. If you're building a classic muscle car or a performance-oriented street machine, this camshaft can help you achieve that aggressive sound and feel.