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COMP Cams CL12-601-8 Mutha' Thumpr 235/249 Hydraulic Roller Cam and Lifter Kit for Chevy Small Block

(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)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

CL12-601-8
4 reviews
Sale Price

$1,210.95

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Product Details

The COMP Cams Mutha' Thumpr CL12-601-8 is a complete hydraulic roller camshaft and lifter kit engineered for Chevrolet small block V8 engines seeking an aggressive idle and strong mid-range performance. This cam delivers the signature "Thumpr" loping idle that enthusiasts love while providing excellent throttle response and power gains.

Camshaft Specifications:

  • Advertised Duration: 235° intake / 249° exhaust
  • Duration @ .050": 218° intake / 230° exhaust
  • Valve Lift: .525" intake / .540" exhaust (with 1.5 rocker ratio)
  • Lobe Separation Angle: 112°
  • Hydraulic roller design for reduced friction and improved durability

Complete Kit Includes:

  • Hydraulic roller camshaft
  • 16 hydraulic roller lifters
  • Assembly lube for proper break-in
  • COMP Cams decals
  • Detailed installation instructions

The Mutha' Thumpr series is designed for street performance applications with 9.0:1 to 10.5:1 compression ratios and works best with 2,000+ RPM stall converters and 3.73 or higher rear gear ratios. This cam produces peak power in the 2,500-6,200 RPM range, making it ideal for street rods, muscle cars, and performance trucks that demand an aggressive sound with strong acceleration.

Requires compatible hydraulic roller valve train components including roller rockers, hardened pushrods, and performance valve springs (not included). Professional installation and proper valve train setup are recommended for optimal performance and engine longevity.

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

311

Advertised Intake Duration

291

Basic Operating RPM Range

2,200-5,900

Kit Type

Cl-Kit - Cam and Lifter Kit

Exhaust Valve Lift

0.507

Intake Valve Lift

0.521

Exhaust Duration at .050 inch Lift

249

Camshaft Material

Austempered Ductile Iron

SK-Kit Upgrade

GK12-601-8

K-Kit Upgrade

K12-601-8

AMAZON ASIN

B001GERIX6

Usage

Street/Performance

Assembly Lubricant 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.

Gaskets Included

No

Camshaft Gear Attachment

3-Bolt

Locks Included

No

Lifter Type

Hydraulic Roller

Intake Duration at .050 Inch Lift

235

Cam Type

Hydraulic Roller

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

No

LOBE SEPARATION

107

Engine Family

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

Valve Stem Seals Included

No

Camshaft Series

Thumpr

Great Price on products and Shipping

Fast shipping, Good communication, Highly recommended.!!!

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