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COMP Cams 11-602-8 Big Mutha' Thumpr Hydraulic Roller Camshaft 243/257 Chevy Big Block

(Chevrolet Camaro 1967-72, Corvette 1967-74, Impala 1965-76, Malibu 1966-67, 1973-75, C1500 1990-93, Chevelle 1965-73, Blazer 1973-74 + 107 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

11-602-8
6 reviews
Sale Price

$549.95

Estimated ship date Tuesday, November 24

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Product Details

The COMP Cams Big Mutha' Thumpr camshaft delivers an aggressive idle and serious performance for street and strip big block Chevrolet engines. This hydraulic roller cam features 243° intake and 257° exhaust duration at .050" lift, providing a radical lope at idle while maintaining excellent street manners and reliability.

Key Specifications:

  • Duration at .050": 243° Intake / 257° Exhaust
  • Advertised Duration: 287° Intake / 301° Exhaust
  • Valve Lift (with 1.7 ratio): .574" Intake / .598" Exhaust
  • Lobe Separation Angle: 112°
  • Hydraulic roller design for reduced friction and maintenance
  • Compatible with Chevrolet Big Block 396-454 engines

Performance Features:

  • Signature "Thumpr" sound with pronounced idle characteristics
  • Optimized for engines with aftermarket heads and intake manifolds
  • Requires valve springs with 120-130 lbs seat pressure and 320-330 lbs open pressure
  • Recommended RPM range: 1,800-5,800 RPM
  • Ideal for street machines, muscle cars, and weekend warriors

This camshaft requires hydraulic roller lifters, compatible valve springs, and proper valve train components (not included). The Big Mutha' Thumpr is designed for enthusiasts who want maximum attitude with the convenience of hydraulic operation. Best results achieved with 9.5:1 or higher compression ratio and headers.

Products specifications

Fits

Chevrolet Camaro 1967-72, Corvette 1967-74, Impala 1965-76, Malibu 1966-67, 1973-75, C1500 1990-93, Chevelle 1965-73, Blazer 1973-74, C10 Pickup 1968-80, Caprice 1966-76, C10 1975-81, El Camino 1966-75, Monte Carlo 1970-75 + 102 more models

Advertised Exhaust Duration

319

Advertised Intake Duration

299

Basic Operating RPM Range

2,500-6,100

Grind Number

299THR7

Exhaust Valve Lift

0.554

Intake Valve Lift

0.57

Intake Duration at .050 Inch Lift

243

Exhaust Duration at .050 inch Lift

257

Camshaft Material

Austempered Ductile Iron

Cam and Lifter Kit Upgrade

CL11-602-8

K-Kit Upgrade

K11-602-8

Assembly Lubricant Included

No

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.

Camshaft Gear Attachment

3-Bolt

Lifter Type

Hydraulic Roller

Cam Type

Hydraulic Roller

AMAZON ASIN

B0014F35SY

LOBE SEPARATION

107

Usage

Street/Strip

Cam, Lifter and Gear Drive Upgrade

GK11-602-8

Camshaft Series

Thumpr

Engine Family

Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)

Lowest prices I found on the net and great customer service! Fast shipping too!

Best price around and good service.

Very pleasant.

I ordered a universal Hurst Pistol Grip "shift knob" for my '12 Mustang GT. It squeezed to a perfect fit right where I need to grip it. It improved shift time and accuracy greatly and feels and looks great! Autoplicity had the best price on the web and I got this in 3 business days. I recommend this product.

Order was fast, had the products I wanted in stock, and vehry pleased. Thank you 5 star service.

I received my Corsa exhaust for my Sequoia today; I had issues with Autoplicity with regard to the order/availability which once brought to their attention was rectified; in the end I had to wait a little longer than expected to receive my order but it was resolved and hopefully the management learned something from this experience.

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