What kind of idle can I expect with this camshaft?

This is the 'Big Mutha' Thumpr' camshaft, and it lives up to its name. You should expect a very rough, lopey idle. This aggressive idle is a characteristic of high-performance camshafts designed for street/strip use and indicates the engine is set up for significant power.

What other parts do I need to install this camshaft?

To properly utilize this camshaft, COMP Cams recommends a minimum of 9.5:1 compression, a torque converter with a 2800+ RPM stall speed, an upgraded intake manifold, appropriate rear-end gearing, and a set of headers. It's crucial to have these supporting modifications for optimal performance and engine health.

Is this camshaft compatible with all Ford 351 engines?

This camshaft is specifically designed for the Ford 351 Cleveland, 351 Modified, and 400 Modified engines. It is not intended for other variations of the 351 Windsor or other Ford engine families. Always verify your engine code before purchasing.

COMP Cams Camshaft 32-602-8 Big Mutha' Thumpr Hydraulic Roll

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

COMP Cams Camshaft FC 299Th R7 Thumper R

$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.

This COMP Cams Big Mutha' Thumpr camshaft is for Ford 351C, 351M-400M engines. It offers a very rough idle for street/strip performance.

Key Features

Fits Ford 351 Cleveland, 351 Modified, 351 Cobra-Jet, Boss 351, and 400 Modified engines.
Hydraulic roller camshaft design for improved performance and durability.
Aggressive camshaft profile with a 243/257 duration and 0.558"/0.578" lift.
Designed for street/strip use, producing a very rough idle.
Requires a minimum of 9.5:1 compression ratio.
Needs a 2800+ RPM stall speed torque converter.

⚠️ 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 serious power out of your Ford 351 Cleveland, 351 Modified, or 400M engine, this Big Mutha' Thumpr camshaft from COMP Cams is a popular choice. This hydraulic roller camshaft is designed for street/strip applications, meaning it's built to perform well both on the road and at the drag strip. It's a substantial upgrade that will noticeably change the character of your engine, giving it a very rough idle that signals serious performance.

To make the most of this camshaft, you'll need to ensure your engine is set up to handle its demands. COMP Cams recommends a minimum of 9.5:1 compression ratio to effectively utilize the cam's profile. You'll also need a torque converter with at least a 2800 RPM stall speed to keep the engine in its power band, along with supporting modifications like an upgraded intake manifold, proper gearing in your rear end, and a good set of headers. This camshaft fits a wide range of Ford vehicles, including models like the Ford Mustang, F-150, and Bronco, as well as Mercury Cougar and Montego.

This is a serious camshaft for a serious build. It's not a subtle change; the rough idle is a direct result of the aggressive lobe separation and duration, which are key to its performance gains. Be prepared for a loud, lopey idle that lets everyone know your engine means business. It's a well-built component designed to deliver a significant boost in performance when paired with the right supporting modifications.