What compression ratio and stall speed are recommended for this camshaft?

For optimal performance with the Big Mutha' Thumpr camshaft, a minimum compression ratio of 9.5:1 is recommended. You'll also want a torque converter with a stall speed of 2800 RPM or higher to effectively utilize the camshaft's powerband.

Will this camshaft work with my factory roller camshaft engine?

No, this is a hydraulic flat tappet camshaft and is not compatible with factory roller camshaft engines. GM began phasing in roller cams around 1985, so you may need to inspect your engine to confirm if it uses a flat tappet or roller setup.

What kind of idle can I expect with this camshaft?

This camshaft is designed for aggressive street/strip performance and will produce a very rough idle. This is a normal characteristic for a camshaft of this profile and indicates it's ready for high-RPM operation.

COMP Cams Camshaft 12-602-4 for Chevy Small Block

Name: COMP Cams Camshaft CS 295T H-107 BMT Th
Brand: COMP Cams
SKU: comp-cams-comp-cams-camshaft-cs-295t-h-107-bmt-th-t14-4390298
Price: 320.45 USD
Availability: BackOrder

COMP Cams Camshaft CS 295T H-107 BMT Th

$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 Big Mutha' Thumpr camshaft for Chevy Small Block 262-400. Needs 9.5:1 compression and 2800+ stall for street/strip use.

Key Features

Fits Chevrolet Gen 1 Small Blocks including 262-400 cubic inch engines.
Hydraulic flat tappet camshaft with a 243/257 degree duration at .050 lift.
Designed for street/strip applications, requiring 9.5:1 compression and a 2800+ RPM stall converter.
Requires headers and an upgraded intake system for optimal performance.
Expect a very rough idle characteristic of a high-performance camshaft.
Not CARB approved and cannot be shipped to California.

⚠️ 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

If you're building a street/strip machine with a Chevrolet Small Block engine, this Big Mutha' Thumpr camshaft from COMP Cams is designed to give you a serious attitude adjustment. This camshaft is intended for engines ranging from 262 cubic inches all the way up to 400 cubic inches, and it's a popular choice for those looking to get a noticeable bump in performance for weekend track days or spirited driving.

This camshaft features a 243/257 degree duration at .050 lift, which is a pretty aggressive profile for a hydraulic flat tappet design. To make the most of this camshaft, you'll want to ensure your engine has at least 9.5:1 compression, a torque converter with a stall speed of 2800 RPM or higher, and you'll definitely want to run headers and a good intake system. Be aware that this cam is designed for maximum performance and will result in a very rough idle, which is part of its character and a sign that it's working hard.

This camshaft fits a wide variety of Chevrolet Gen 1 Small Block engines found in many classic cars and trucks. It's important to confirm your specific engine is a flat tappet design, as factory roller cams were phased in starting in the mid-80s. If you're unsure, checking your intake manifold or timing cover can help you identify the correct setup for your build.