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COMP Cams GK11-600-4 Thumpr Hydraulic Flat Camshaft Kit for Chevy 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

GK11-600-4
4 reviews
Sale Price

$696.53

Estimated ship date Thursday, November 19

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Product Details

The COMP Cams GK11-600-4 Thumpr camshaft kit delivers aggressive performance with a distinctive lope for Chevrolet Big Block engines (396-454 cubic inches). This complete GK-Kit includes everything needed for a successful camshaft installation, featuring COMP Cams' popular Thumpr grind profile designed for street performance enthusiasts who want head-turning sound and increased power.

Camshaft Specifications:

  • Advertised Duration: 279°/297° (intake/exhaust)
  • Duration at .050": 227°/241° (intake/exhaust)
  • Valve Lift: .474"/.510" (intake/exhaust with 1.7:1 rocker ratio)
  • Lobe Separation Angle: 112°
  • Hydraulic flat tappet design for excellent street manners
  • Optimal RPM range: 1,800-5,400 RPM

Complete Kit Includes:

  • Hydraulic flat tappet camshaft
  • Hydraulic lifters (tappets)
  • Valve springs, retainers, and locks
  • Assembly lubricant
  • Pushrod length checking tool

This Thumpr profile produces the aggressive choppy idle sound that muscle car enthusiasts crave while maintaining good street drivability and vacuum for power brakes. The asymmetrical lobe design emphasizes exhaust duration for that signature rumble. Recommended for engines with aftermarket intake manifolds, headers, 9.5:1+ compression, and 2,400+ stall speed converters in automatic transmissions. Excellent choice for street rods, classic muscle cars, and weekend cruisers seeking maximum attitude with reliable hydraulic operation.

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

297

Advertised Intake Duration

279

Basic Operating RPM Range

1,800-5,600

Cam Type

Hydraulic Flat Tappet

Exhaust Valve Lift

0.483

Intake Valve Lift

0.498

Exhaust Duration at .050 inch Lift

241

Kit Type

GK-Kit - Cam and Gear Kit

AMAZON ASIN

B002EE38PO

Usage

Street/Performance

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

227

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

Yes

Valve Stem Seals Included

No

Pushrods Included

No

Camshaft Series

Thumpr

Engine Family

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

Very satisfied! My intake shipped on Friday and I received it on Tuesday. Not only super fast shipping, but a great deal to boot!

I ordered a hitch off of this site for Christmas, I have never heard of it nor did I know how they were, but they are great! Got my package in I'd say 4 days, very fast and it was exactly what I wanted! Only down fall was they charged me 3 times and I was short 150$ for a few days. I got my money back and I would definitely order again.

Great prices, and much faster delivery than expected. They "over-delivered" on what they said they'd do. Will definitely use them again!

Very good customer service asked about a lot of different springs and parts for my Mazdaspeed 3.

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