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COMP Cams CL20-602-4 Big Mutha' Thumpr Hydraulic Flat Camshaft Lifter Kit

(Jeep Grand Cherokee 1993-98, Grand Wagoneer 1993; Dodge Durango 1998-2002, Ram 2500 1994-2002, Ram 1500 1994-2002, Dakota 1989-2002 + 131 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

CL20-602-4
9 reviews
Sale Price

$397.95

In Stock (6)

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Usually delivered within 2 days

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Product Details

The COMP Cams Big Mutha' Thumpr CL20-602-4 is a complete camshaft and lifter kit designed for Chrysler small block engines (273-360 cubic inch). This hydraulic flat tappet cam delivers an aggressive 243/257 duration split for maximum low-end torque and that distinctive muscle car idle tone.

Key Specifications:

  • Advertised Duration: 243° Intake / 257° Exhaust
  • Duration at .050": 227° Intake / 241° Exhaust
  • Valve Lift: .495" Intake / .520" Exhaust (with 1.5:1 rocker ratio)
  • LSA (Lobe Separation Angle): 107°
  • Hydraulic flat tappet design for classic Mopar applications
  • Compatible with Chrysler 273, 318, 340, and 360 small block engines

Complete Kit Includes:

  • Camshaft
  • Hydraulic lifter set (16 lifters)
  • Assembly lube for proper break-in
  • Installation instructions
  • COMP Cams decals

The Big Mutha' Thumpr series is engineered for street machines where a radical idle, strong throttle response, and excellent mid-range power are priorities. The aggressive exhaust duration creates the signature lope while maintaining good vacuum for power brakes and accessories. This cam works best with 9.0:1 or higher compression, performance headers, and a higher stall torque converter (2,400-3,000 RPM recommended). Optimal power range is 1,800-5,400 RPM.

Professional installation recommended. Proper break-in procedure is critical for camshaft longevity.

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 + 127 more models

Advertised Intake Duration

295

Basic Operating RPM Range

2,500-6,400

Cam Type

Hydraulic Flat Tappet

Engine Family

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

Intake Valve Lift

0.507

Kit Type

Cl-Kit - Cam and Lifter Kit

Exhaust Valve Lift

0.494

Intake Duration at .050 Inch Lift

243

Exhaust Duration at .050 inch Lift

257

Camshaft Material

Cast Iron

K-Kit Upgrade

K20-602-4

AMAZON ASIN

B002EE16DA

Assembly Lubricant Included

Yes

Camshaft Gear Attachment

1-Bolt

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.

Gaskets Included

No

Locks Included

No

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

No

LOBE SEPARATION

107

Usage

Street/Strip

Advertised Exhaust Duration

313

Valve Stem Seals Included

No

Camshaft Series

Thumpr

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