What kind of idle can I expect with this camshaft?

This COMP Cams Mutha' Thumpr camshaft is designed for aggressive street/strip performance and will produce a noticeable, rough idle. It's intended for builders who prioritize power and sound over a smooth, quiet idle.

What supporting modifications are needed for this cam kit?

To get the most out of this kit, you'll need at least 9:1 compression, a torque converter with a 2500+ RPM stall speed, an upgraded intake manifold, rear gearing, and headers. These components help the engine breathe and utilize the cam's aggressive profile effectively.

Does this kit come with everything needed for installation?

Yes, the kit includes the camshaft, a full set of hydraulic roller lifters, assembly lube to aid in proper break-in, installation decals, and detailed instructions. Ensure you have other necessary installation items like gaskets and fluids.

COMP Cams Hydraulic Roller Cam & Lifter Kit 20-601-9

Name: COMP Cams Cam & Lifter Kit CRS 291T HR-
Brand: COMP Cams
Price: 1317.99 USD
Availability: InStock

COMP Cams Cam & Lifter Kit CRS 291T HR-

$1317.99

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 hydraulic roller cam and lifter kit for Chrysler LA engines. Rough idle, street/strip performance.

Key Features

Fits Chrysler 273, 318, 340, and 360 LA engines.
Hydraulic roller camshaft with 235/249 degrees duration at .050 inch lift.
Requires 9:1 compression ratio, 2500+ RPM stall torque converter, intake, gears, and headers.
Produces a rough idle suitable for street/strip performance applications.
Kit includes camshaft, lifters, assembly lube, decals, and instructions.
Not CARB approved; cannot ship 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

This COMP Cams Mutha' Thumpr camshaft and lifter kit features a 235/249 degree duration at .050 inch lift, designed for serious street and strip performance on Chrysler LA engines. It requires a minimum of 9:1 compression, a 2500+ RPM stall torque converter, and supporting modifications like headers and intake to really shine. Expect a noticeable, rough idle that lets everyone know this isn't your average cruiser cam.

The kit includes the camshaft, a full set of hydraulic roller lifters, assembly lube, decals, and installation instructions, making it a comprehensive package for your engine build. This setup is built for high-output applications where aggressive performance is the goal. It's important to note that this kit is not CARB approved and cannot be shipped to California.

This kit fits a wide range of Chrysler, Dodge, and Plymouth vehicles from the mid-60s through the early 90s, including popular models like the Dodge Challenger, Plymouth Barracuda, and Chrysler Cordoba. Ensure your engine has the necessary supporting modifications and compression ratio to take full advantage of this cam's aggressive profile.