What kind of idle sound can I expect from this camshaft?

This COMP Cams Thumper camshaft is specifically designed to produce a noticeable, choppy, and thumping idle sound. It's a signature characteristic that many enthusiasts look for to give their vehicle an aggressive auditory presence.

What is the recommended setup to get the most out of this camshaft?

While this camshaft can work with a stock torque converter, COMP Cams recommends pairing it with a torque converter that has a stall speed of 2000 RPM or higher. Using appropriate rear-end gearing will also help maximize the performance gains from this camshaft.

Are there any special break-in procedures for this camshaft?

Yes, like most performance camshafts, it's crucial to follow the manufacturer's recommended break-in procedure. This typically involves running the engine at a specific RPM for a set period immediately after installation to properly seat the cam lobes and lifters.

COMP Cams Thumper Camshaft 10-600-11 for AMC/Jeep

Name: COMP Cams Camshaft A8 283THR7 Thumper
Brand: COMP Cams
Price: 661.71 USD
Availability: InStock

COMP Cams Camshaft A8 283THR7 Thumper

$661.71

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COMP Cams Thumper camshaft (10-600-11) for AMC 290-401 and Jeep 4.0L engines. Choppy idle, improved street performance.

Key Features

Fits AMC 290, 304, 343, 360, 390, and 401 V8 engines.
Compatible with a wide range of Jeep models including CJ5, CJ7, Cherokee, and Wagoneer.
Features a hydraulic roller design for improved efficiency and performance.
Offers a distinct, choppy, thumping idle sound.
Intake duration is 227 degrees and exhaust duration is 241 degrees.
Best performance achieved with a 2000+ RPM stall torque converter and appropriate gearing.

⚠️ 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 looking to give your AMC or Jeep V8 engine a distinct, aggressive sound and a noticeable bump in street performance, this COMP Cams Thumper camshaft is a solid choice. It's designed for AMC 290, 304, 343, 360, 390, and 401 cubic inch V8 engines, and also fits a wide range of Jeep models from the 1970s and 80s, including the CJ series and early Cherokee and Wagoneer. This camshaft is known for its signature choppy, thumping idle that lets everyone know you mean business.

This is a hydraulic roller camshaft, which generally means less friction and better performance compared to flat tappet designs. The 227/241 degree intake/exhaust duration is tuned for street use, offering improved power without requiring a full race setup. While it can work with a stock torque converter, COMP Cams recommends a 2000+ RPM stall converter and appropriate gearing to really unlock its potential and get the most out of the improved airflow. This camshaft is a popular upgrade for those wanting a more visceral driving experience and a sound that stands out.

When installing a camshaft like this, it's important to follow the manufacturer's recommended break-in procedure carefully to ensure proper seating and longevity. You'll also want to ensure your valve springs are up to the task, as higher lift cams often require stiffer springs. This camshaft is not CARB approved and cannot be shipped to California.