What is included in the COMP Cams K20-603-9 kit?

This kit includes the Big Mutha' Thumpr 243/257 hydraulic roller camshaft, lifters, valve springs, retainers, valve locks, valve stem seals, a timing chain set, assembly lube, and decals. It also comes with instructions for installation.

What other modifications are recommended for this camshaft kit?

For optimal performance, COMP Cams recommends a minimum of 9.5:1 compression, a 2800+ RPM stall torque converter, an upgraded intake manifold, appropriate rear axle gears, and headers. These components help the camshaft achieve its full potential.

What kind of idle can I expect with this camshaft?

This camshaft is designed for high-performance street/strip use and will produce a very rough idle. This aggressive idle is a common characteristic of cams that provide significant power gains.

COMP Cams Camshaft Kit K20-603-9 - Chrysler LA 273-360

Name: COMP Cams Camshaft Kit CRS 299T HR-7 BM
Brand: COMP Cams
Price: 1917.34 USD
Availability: InStock

COMP Cams Camshaft Kit CRS 299T HR-7 BM

$1917.34

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 Kit K20-603-9. This kit includes camshaft, lifters, springs, retainers, locks, seals, timing set, and lube for Chrysler LA engines.

Key Features

Fits Chrysler LA 273, 318, 340, and 360 engines.
Includes camshaft, lifters, valve springs, retainers, valve locks, valve stem seals, and timing chain set.
Also includes assembly lube, decals, and instructions.
Designed for street/strip applications.
Requires 9.5:1 compression, 2800+ stall converter, intake, gears, and headers.
Features a very rough idle characteristic of high-performance cams.

⚠️ 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 ready to seriously upgrade the performance of your Chrysler LA-series engine, this COMP Cams Camshaft Kit K20-603-9 is a comprehensive package designed to get you there. Inside this box, you'll find everything needed to swap in the Big Mutha' Thumpr 243/257 hydraulic roller camshaft: the camshaft itself, a set of lifters, valve springs, retainers, valve locks, valve stem seals, and a timing chain set. It also includes assembly lube and decals to help with the installation process. This kit is intended for street/strip applications and is designed for engines like the Chrysler 273, 318, 340, and 360, as well as many other vehicles from brands like Dodge and Plymouth from the mid-60s through the early 90s.

This camshaft kit is built for performance, requiring at least 9.5:1 compression, a 2800+ RPM stall torque converter, and supporting modifications like an upgraded intake, rear gears, and headers to really shine. Expect a very rough idle with this setup, which is characteristic of a high-performance camshaft designed for maximum power. The hydraulic roller design means it's more efficient and durable than traditional flat tappet cams, and the included components are all selected to work together seamlessly for improved engine breathing and power output.

For a build like this, it's important to have all the necessary parts on hand. This kit aims to provide that, simplifying the process of upgrading your engine's valvetrain. Remember that this kit is not CARB approved and cannot be shipped to California. Always refer to the included instructions for proper installation and break-in procedures to ensure the longevity and performance of your new camshaft and components.