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COMP Cams GK11-601-4 Thumpr Hydraulic Flat Camshaft Kit for Chevrolet Big Block 396-454

(Chevrolet Camaro 1967-72, Corvette 1966-74, Impala 1965-76, Malibu 1966-67, 1973-75, C1500 1990-93, Chevelle 1965-73, Blazer 1973-74 + 106 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

GK11-601-4
5 reviews
Sale Price

$671.34

Estimated ship date Thursday, November 19

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Product Details

The COMP Cams GK11-601-4 Thumpr camshaft kit delivers aggressive performance and that distinctive loping idle sound for Chevrolet Big Block 396-454 engines. This complete GK-Kit (Great Kit) includes everything needed for a professional camshaft installation, eliminating the guesswork of component matching.

Camshaft Specifications:

  • Advertised Duration: 279°/297° intake/exhaust
  • Duration at .050": 235°/249° intake/exhaust
  • Valve Lift: .525"/.540" intake/exhaust (with 1.7:1 rocker ratio)
  • Lobe Separation Angle: 107°
  • Hydraulic flat tappet design for easy maintenance
  • Recommended RPM Range: 1,800-5,600 RPM

Complete Kit Includes:

  • Thumpr camshaft with aggressive performance profile
  • Hydraulic flat tappet lifters (16)
  • Valve springs, retainers, and locks
  • Camshaft installation assembly lube
  • Pushrods engineered to match cam specifications
  • Timing set for precise valve timing

This Thumpr camshaft is designed for street performance applications where aggressive sound and improved throttle response are desired. The asymmetric lobe design produces more exhaust duration than intake, creating the signature choppy idle while maintaining good drivability. Best suited for engines with 9.0:1 or higher compression ratio, aftermarket converter recommended for automatic transmissions. This kit provides excellent value by bundling all critical installation components in one package.

Products specifications

Fits

Chevrolet Camaro 1967-72, Corvette 1966-74, 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 + 101 more models

Advertised Exhaust Duration

305

Basic Operating RPM Range

2,000-5,900

Cam Type

Hydraulic Flat Tappet

Intake Valve Lift

0.51

Exhaust Duration at .050 inch Lift

249

Kit Type

GK-Kit - Cam and Gear Kit

AMAZON ASIN

B002EE16QW

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

Exhaust Valve Lift

0.495

Locks Included

No

Intake Duration at .050 Inch Lift

235

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

Yes

Usage

Street/Strip

Advertised Intake Duration

287

Valve Stem Seals Included

No

Pushrods Included

No

Camshaft Series

Thumpr

Engine Family

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

product just as described, received in 3 days

I paid for 2nd day shipping and 5 days later they were shipped out. So, I should receive my rotors in a full week from when I paid for 2 day shipping. I called customer service and they discounted the shipping rate to ground service. At least they were polite and helpful in the phone.

Autoplicity can not be beat on prices, handling, and shipping times! Very easy to deal with and quick to respond if you have any problems with your order! They are always looking out to save you money and get your parts fast!

Great prices will shop here again.

Excellent on-line merchant with outstanding customer service and the best prices on equipment and shipping. Highly reccomended!

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