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COMP Cams 10-602-11 Big Mutha' Thumpr 243/257 Hydraulic Roller Camshaft for AMC 290-401

(Jeep Cherokee 1974-83, CJ7 1976-81, CJ5 1971-81, Grand Wagoneer 1984-91, J10 1974-88, Wagoneer 1972-83, J20 1974-88, Commando 1972-73 + 27 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

10-602-11
12 reviews
Sale Price

$608.95

1 left at this price

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Usually delivered within 2 days

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Product Details

The COMP Cams Big Mutha' Thumpr hydraulic roller camshaft is engineered to deliver an aggressive, race-inspired exhaust note at idle while providing substantial horsepower gains and a broad, usable torque curve. With a 243/257 duration profile, this camshaft is specifically designed for AMC 290-401 cubic inch V8 engines and is ideal for muscle car restorations, street rods, and performance street applications where an intimidating sound is just as important as real-world performance.

Key Features:

  • Hydraulic roller design for reduced friction and improved durability compared to flat tappet cams
  • 243° intake / 257° exhaust duration creates optimum valve overlap for that distinctive loping idle
  • Early intake valve opening and extended exhaust duration produce the signature Thumpr sound
  • Broad torque curve delivers strong mid-range power for street driving
  • Direct replacement for AMC 290, 304, 343, 360, 390, and 401 V8 engines

Important Installation Notes:

  • Requires aftermarket torque converter with higher stall speed (2,400+ RPM recommended)
  • Lower gear ratios (3.73:1 or numerically higher) required to keep engine in powerband
  • Reduced idle vacuum requires vacuum canister, electric vacuum pump, or hydroboost system for power brake operation
  • Upgraded valve springs and compatible lifters required for proper operation

This camshaft is part of COMP Cams' legendary Thumpr series, which has become the go-to choice for enthusiasts who want head-turning sound combined with real performance gains. While the aggressive profile does require supporting drivetrain modifications, the result is a street machine that sounds as good as it performs.

Products specifications

Fits

Jeep Cherokee 1974-83, CJ7 1976-81, CJ5 1971-81, Grand Wagoneer 1984-91, J10 1974-88, Wagoneer 1972-83, J20 1974-88, Commando 1972-73, CJ6 1971-75, J-100 1971-73, J-2500 1970-73, J-4600 1971-73, J-4500 1971-73, J-4800 1971-73 + 21 more models

Advertised Exhaust Duration

319

Advertised Intake Duration

299

Basic Operating RPM Range

2,500-6,400

Grind Number

299THR7

Engine Family

American Motors 290-401 c.i. 8 Cylinder (1966-1991)

Intake Valve Lift

0.552

Exhaust Valve Lift

0.537

Intake Duration at .050 Inch Lift

243

Exhaust Duration at .050 inch Lift

257

Usage

Street/Performance

Assembly Lubricant Included

No

Camshaft Gear Attachment

1-Bolt

Lifters Included

No

Valve Springs Required

Yes

Prop 65

WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov

C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for On-Road Vehicles?

No

C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?

Yes, but must be a race/competition only vehicle.

C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

Lifter Type

Hydraulic Roller

Cam Type

Hydraulic Roller

Camshaft Material

Billet Steel

LOBE SEPARATION

107

Camshaft Series

Thumpr

Easy and Pleasant, Fast Shipping Great Product. THanks

seams good

Searching and product listings could be a bit easier to follow along with and cleaner. That is my only complaint.

easy to use and easy to pay

good service

Quick easy fair price

Quick and easy

Fast and easy

Easy to order. Fast Shipping. Excellent packing. Overall great experience. Will do business again and recommend to others!

Very quick and easy with PayPal..Bought here because they use PayPal

Quick, cheap, and accurate. What else do you need?

best price

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