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COMP Cams CL42-602-5 Big Mutha' Thumpr Hydraulic Flat Camshaft Kit Oldsmobile 260-455

(Chevrolet Camaro 1972-74, Corvette 1972, Impala 1972-74, Malibu 1973, Chevelle 1973, Caprice 1973, 1986-90, Nova 1972-74, Bel Air 1972-74 + 44 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

CL42-602-5
5 reviews
Sale Price

$468.95

Estimated ship date Thursday, October 29

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Product Details

The COMP Cams Big Mutha' Thumpr CL42-602-5 is a complete hydraulic flat tappet camshaft and lifter kit designed specifically for Oldsmobile V8 engines from 260 to 455 cubic inches. This aggressive camshaft delivers the iconic loping idle and strong mid-range power that muscle car enthusiasts crave, with a duration of 242/257 degrees.

Key Specifications:

  • Advertised Duration: 288°/302° intake/exhaust
  • Duration at .050": 242°/257° intake/exhaust
  • Valve Lift: .525"/.540" intake/exhaust (with 1.6 rocker ratio)
  • Lobe Separation Angle: 107 degrees
  • Hydraulic flat tappet design for excellent street manners
  • Optimized for engines with 9.0:1 to 10.5:1 compression ratio
  • Recommended RPM range: 1,800-5,800

Complete Kit Includes:

  • High-performance hydraulic flat tappet camshaft
  • Assembly lube for proper break-in
  • Installation instructions
  • COMP Cams decals

The Big Mutha' Thumpr series is engineered for street performance applications where aggressive sound and strong low-to-mid range torque are priorities. This camshaft works exceptionally well with automatic transmissions and stock-to-mild performance components. Ideal for Oldsmobile 260, 307, 330, 350, 403, 425, and 455 engines in street rods, muscle cars, and classic restorations.

Important: This aggressive profile requires proper valve spring selection and may require additional valvetrain modifications. Verify piston-to-valve clearance before installation. Computer reprogramming or carburetor retuning is recommended for optimal performance.

Products specifications

Fits

Chevrolet Camaro 1972-74, Corvette 1972, Impala 1972-74, Malibu 1973, Chevelle 1973, Caprice 1973, 1986-90, Nova 1972-74, Bel Air 1972-74, Laguna 1973-74; Pontiac Firebird 1977-79, Grand Prix 1977, Bonneville 1972, 1977-81 + 40 more models

Advertised Exhaust Duration

312

Advertised Intake Duration

294

Basic Operating RPM Range

2,500-6,400

Cam Type

Hydraulic Flat Tappet

Kit Type

Cl-Kit - Cam and Lifter Kit

Exhaust Valve Lift

0.497

Intake Valve Lift

0.512

Exhaust Duration at .050 inch Lift

257

Camshaft Material

Cast Iron

Engine Family

Oldsmobile 260-455 c.i. 8 Cylinder (1967-1990)

AMAZON ASIN

B005H89VGE

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

Intake Duration at .050 Inch Lift

242

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

No

LOBE SEPARATION

107

Usage

Street/Strip

Valve Stem Seals Included

No

Camshaft Series

Thumpr

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