

Specifications
- Brand
- COMP Cams
- Part #
- 20-603-9
- UPC
- 036584150978

COMP Cams Camshaft CRS 299T HR-107 BMT
$641.25
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COMP Cams Big Mutha' Thumpr camshaft for Chrysler 273-360 LA engines. Hydraulic roller, 243/257 duration. Part# 20-603-9.
Key Features
- Fits Chrysler 273, 318, 340 and 360 LA engines.
- Hydraulic roller camshaft design for improved performance and durability.
- Intake duration: 243 degrees; Exhaust duration: 257 degrees.
- Lobe separation angle: 107 degrees.
- Aggressive street/strip grind with a very rough idle.
- Requires 9.5:1 compression, 2800+ RPM stall converter, upgraded intake, gears, and headers.
⚠️ 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
Product Details
This COMP Cams Big Mutha' Thumpr camshaft is a hydraulic roller camshaft designed for Chrysler 273, 318, 340, and 360 cubic inch LA engines. It's built for street/strip applications and will give your engine a very rough idle, signaling its aggressive nature. To get the most out of this camshaft, you'll need to pair it with other performance components. This includes a minimum of 9.5:1 compression, a torque converter with at least a 2800 RPM stall speed, and upgraded intake, rear gears, and headers. Without these supporting modifications, the camshaft won't be able to perform to its potential.
The camshaft features a duration of 243 degrees on the intake side and 257 degrees on the exhaust side, with a lobe separation angle of 107 degrees. This specific grind, the CRS 299T HR-107 BMT, is known for its significant performance gains in the upper RPM range, making it a popular choice for those looking to build a powerful street machine or a dedicated drag car. The hydraulic roller design means less friction and more efficient operation compared to flat tappet cams, allowing for higher RPMs and more aggressive lobe profiles.
This camshaft is intended for enthusiasts who are comfortable with significant engine modifications and understand the requirements for optimal performance. It's important to note that this camshaft is not CARB approved and cannot be shipped to California. Ensure you have the necessary supporting modifications and are prepared for the aggressive idle characteristics before installation.
Specifications
- Brand
- COMP Cams
- Manufacturer Part #
- 20-603-9
- UPC
- 036584150978
Frequently Asked Questions
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