My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

COMP Cams GK08-602-8 Big Mutha' Thumpr Hydraulic Roller Camshaft Kit for Small Block Chevy

(GMC G2500 1987-95, Yukon 1992-95, K1500 1988-95, C1500 1988-95, K2500 1988-95, Jimmy 1987-91, C3500 1988-95, K2500 Suburban 1992-95 + 83 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

GK08-602-8
6 reviews
Sale Price

$1,193.95

Estimated ship date Friday, November 20

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The COMP Cams Big Mutha' Thumpr GK08-602-8 is a complete hydraulic roller camshaft kit engineered for maximum performance in OE roller-equipped small block Chevy engines. This aggressive camshaft delivers the iconic Thumpr sound with serious attitude, featuring 243/257 degrees of advertised duration for a radical idle and strong mid-range to top-end power.

Camshaft Specifications:

  • Advertised Duration: 243°/257° (Intake/Exhaust)
  • Duration @ .050": 207°/221°
  • Valve Lift: .533"/.540" (with 1.5 ratio rocker arms)
  • Lobe Separation Angle: 113°
  • Hydraulic roller design for OE roller blocks
  • Aggressive idle quality with strong mid-range to high-RPM power

Complete GK-Kit Includes:

  • Hydraulic roller camshaft
  • Valve springs and retainers
  • Valve stem seals
  • Camshaft assembly lubricant
  • All necessary installation components

The Big Mutha' Thumpr series represents the most aggressive street-oriented camshafts in the COMP Cams lineup, designed for enthusiasts who want maximum performance with that distinctive choppy idle. This kit is specifically designed to work with factory roller blocks, eliminating the need for aftermarket roller lifters. Ideal for street/strip applications where dramatic sound and strong top-end power are priorities. Requires aftermarket torque converter (3,000+ stall recommended) and rear gear ratio of 3.73 or higher for optimal performance.

Products specifications

Fits

GMC G2500 1987-95, Yukon 1992-95, K1500 1988-95, C1500 1988-95, K2500 1988-95, Jimmy 1987-91, C3500 1988-95, K2500 Suburban 1992-95, K3500 1988-95, C2500 1988-95, K1500 Suburban 1992-95, C1500 Suburban 1992-95, P3500 1987-96 + 78 more models

Advertised Exhaust Duration

319

Advertised Intake Duration

299

Basic Operating RPM Range

1,900-5,600

Engine Family

Chevrolet 305-350 c.i. 8 Cylinder O.E. Roller (1987-1998)

Exhaust Valve Lift

0.519

Intake Valve Lift

0.533

Intake Duration at .050 Inch Lift

243

Exhaust Duration at .050 inch Lift

257

Kit Type

GK-Kit - Cam and Gear Kit

AMAZON ASIN

B002EE2X9G

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

Lifter Type

Hydraulic Roller

Cam Type

Hydraulic Roller

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

Yes

Usage

Street/Strip

Valve Stem Seals Included

No

Pushrods Included

No

Camshaft Series

Thumpr

<br><br>Borgeson 000940<br><br>I found Autoplicity during a price search on the Borgeson steering shaft for my truck. I had never heard of them, and was a bit skepticle. But after doing some research, found that Autoplicity has a good reputation on a Jeep forum I visit.<br><br>I decided to order, and I am impresed. Extremely fast shipping, I placed my order on Saturday, and its now Monday before noon. I am holding the new part!

Quick shipping and they had the fuel jugs I needed for the best prices thanks!<br><br>UPDATE: they were so good I made another order with them within a week.

I ordered an Optima battery for my truck after I did a Google search for the battery. Autoplicity was the cheapest on the Web. Even cheaper then eBay. They got me hooked. Thanks Autoplicity

Great Pricing (lowest i can find anywhere) and Quick Shipping, Product has no damage from shipping! Thank you Autoplicity!

I received my ARP head studs as described and on time with zero problems, and cheaper than anywhere else.Will use again!!!

We ordered a cover for a pickup truck bed and were so pleased that it was shipped so quickly. The price was the lowest that we found on the internet or in any of the stores where we looked. We were notified by e-mail as soon as it shipped. We will definitely shop this site again.

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy