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COMP Cams 20-602-4 Big Mutha' Thumpr Hydraulic Flat Camshaft for Chrysler - 273-360

(Jeep Grand Cherokee 1993-98, Grand Wagoneer 1993; Dodge Durango 1998-2002, Ram 2500 1994-2002, Ram 1500 1994-2002, Dakota 1989-2002 + 134 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

20-602-4
8 reviews
Sale Price

$309.95

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The COMP Cams Big Mutha' Thumpr camshaft delivers the aggressive, loping idle and hard-hitting exhaust note that defines true muscle car attitude. Engineered with 243° intake and 257° exhaust duration, this hydraulic flat tappet camshaft produces excellent horsepower gains across the RPM range while generating a broad, usable torque curve that puts power to the pavement.

Key Features:

  • Hydraulic flat tappet design for Chrysler small block 273-360 engines
  • 243°/257° duration creates signature race car idle with aggressive exhaust note
  • Early intake valve opening and extended exhaust duration optimize valve overlap
  • Broad torque curve delivers strong acceleration and excellent throttle response
  • Perfect for street rods, muscle cars, and aggressive street builds

Installation Requirements:

  • Aftermarket torque converter required for automatic transmissions
  • Lower gear ratio (numerically higher) recommended to keep engine in powerband
  • Reduced idle vacuum requires vacuum canister, electric pump, or hydroboost for power brake applications

The Big Mutha' Thumpr series represents COMP Cams' most aggressive street camshaft profile, combining maximum attitude with real-world performance gains. This camshaft transforms your Chrysler small block into a head-turning machine with unmistakable sound and impressive power delivery.

Products specifications

Fits

Jeep Grand Cherokee 1993-98, Grand Wagoneer 1993; Dodge Durango 1998-2002, Ram 2500 1994-2002, Ram 1500 1994-2002, Dakota 1989-2002, Charger 1966-78, Challenger 1970-74, Ram 3500 1994-2002, Dart 1964-77, 1980-82 + 130 more models

Advertised Intake Duration

295

Basic Operating RPM Range

2,500-6,400

Grind Number

295TH7

Cam Type

Hydraulic Flat Tappet

Engine Family

Chrysler 273-360 c.i. 8 Cylinder (1964-2002)

Intake Valve Lift

0.507

Exhaust Valve Lift

0.494

Intake Duration at .050 Inch Lift

243

Exhaust Duration at .050 inch Lift

257

Camshaft Material

Cast Iron

Cam and Lifter Kit Upgrade

CL20-602-4

K-Kit Upgrade

K20-602-4

AMAZON ASIN

B002EE0FK0

Assembly Lubricant Included

Yes

Camshaft Gear Attachment

1-Bolt

Lifters Included

No

Valve Springs Required

Yes

Lifter Type

Hydraulic Flat Tappet

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.

LOBE SEPARATION

107

Usage

Street/Strip

Advertised Exhaust Duration

313

Camshaft Series

Thumpr

No problems thus far

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I would def order again from them great price and fast shipping.

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Great!!

Great price, fast shipping, excellent customer service. I will definitely do business with them in the future.

No problems ordering a leak down tester from Autoplicity which had the lowest price and reasonable shipping charges. The item was well packaged and I would buy from them again.

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