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COMP Cams 12-600-8 Thumpr Hydraulic Roller Camshaft Small Block Chevy - 227/241

(GMC G2500 1979-95, Yukon 1992-95, K1500 1979-86, 1988-95, C1500 1979-86, 1988-95, K2500 1979-86, 1988-95, Jimmy 1970-91 + 242 more models)

Part of: COMP Cams Thumpr Hydraulic Roller Camshaft Small Block Chevy

Other options in this family: COMP Cams 08-600-8

Manufacturer

Picture for manufacturer COMP Cams

Part Number

12-600-8
7 reviews
Sale Price

$549.95

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The COMP Cams Thumpr 12-600-8 hydraulic roller camshaft delivers aggressive performance with a signature lopey idle for Small Block Chevrolet engines. This camshaft features 227/241 duration specs designed to provide excellent throttle response and strong mid-range torque while maintaining street-friendly drivability.

Key Specifications:

  • Advertised Duration: 279°/297° intake/exhaust
  • Duration @ .050": 227°/241° intake/exhaust
  • Valve Lift: .480"/.480" with 1.5 rocker ratio
  • Lobe Separation Angle: 112°
  • Hydraulic roller design for reduced friction and increased durability
  • Optimized for 9.5:1 to 10.5:1 compression ratios
  • RPM Range: 1,800-5,800 RPM

Performance Features:

  • Aggressive sound with pronounced lope at idle
  • Improved throttle response throughout the power band
  • Excellent street manners with strong acceleration
  • Compatible with stock torque converters and rear gears
  • Requires aftermarket computer or calibration in electronic fuel injection applications

The Thumpr camshaft series is ideal for enthusiasts seeking maximum performance sound with reliable street performance. This cam requires compatible hydraulic roller lifters, timing set, and valve springs for proper installation. Best suited for performance street applications in 262-400 cubic inch Small Block Chevy engines.

Products specifications

Fits

GMC G2500 1979-95, Yukon 1992-95, K1500 1979-86, 1988-95, C1500 1979-86, 1988-95, K2500 1979-86, 1988-95, Jimmy 1970-91, C3500 1979-86, 1988-95, K2500 Suburban 1979-86, 1992-95, K3500 1979-86, 1988-95 + 239 more models

Advertised Exhaust Duration

303

Basic Operating RPM Range

1,900-5,600

Grind Number

283THR7

Exhaust Valve Lift

0.497

Intake Valve Lift

0.511

Exhaust Duration at .050 inch Lift

241

Camshaft Material

Austempered Ductile Iron

Cam and Lifter Kit Upgrade

CL12-600-8

K-Kit Upgrade

K12-600-8

Usage

Street/Performance

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

Intake Duration at .050 Inch Lift

227

Cam Type

Hydraulic Roller

AMAZON ASIN

B0014F35R0

LOBE SEPARATION

107

Cam, Lifter and Gear Drive Upgrade

GK12-600-8

Advertised Intake Duration

283

Engine Family

Chevrolet 262-400 c.i. 8 Cylinder (1958-1998)

Camshaft Series

Thumpr

I put my order at 7/29 and received nothing after the order. I emailed to ask my order status at 7/31 and at 8/1 I received my order. Pretty fast shipping. I am satisfied with the shipping and hope later tonight the product will work fine for my car!

Hard to find part for a great price.

Lowest price and S&H around! Prompt responses! Will def buy from again!

Fast delivery, best price. Recommended seller

Great pricing, fast ship A+++

Unbeatable price and super fast shipping! The website is easy to navigate and there is a wide range of products to choose from. No need to go to the auto parts store when you have Autoplicity.com

No problems ordering a leak down tester from Autoplicity which had the lowest price and reasonable shipping charges. The item was well packaged and I would buy from them again.

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