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COMP Cams K51-601-5 Mutha' Thumpr 235/249 Hydraulic Flat Cam K-Kit For Pontiac 265-455

(Pontiac GTO 1964-73, Firebird 1967-81, Grand Prix 1962-81, Grand Am 1973-75, 1978-80, Bonneville 1957-81, LeMans 1963-81, Catalina 1955-81 + 30 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

K51-601-5
5 reviews
Sale Price

$766.95

Estimated ship date Tuesday, November 24

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Product Details

The COMP Cams Mutha' Thumpr K51-601-5 is a complete camshaft kit engineered specifically for Pontiac 265-455 cubic inch V8 engines. This hydraulic flat tappet cam delivers an aggressive 235/249 duration split that produces a pronounced lopey idle and strong mid-range power, making it ideal for street/strip applications and muscle car builds seeking that classic performance sound.

Complete K-Kit Includes Everything You Need:

  • Hydraulic flat tappet camshaft with 235/249 duration profile
  • Hydraulic lifters designed to match cam specifications
  • Performance valve springs for reliable valve control
  • Spring retainers and valve locks
  • Valve stem seals for proper oil control
  • Timing chain set for precise valve timing
  • Assembly lube to protect components during initial break-in
  • Installation instructions and COMP Cams decals

The Mutha' Thumpr series is designed for enthusiasts who want maximum performance sound combined with strong torque characteristics. This kit eliminates the guesswork by providing all the necessary valvetrain components matched specifically to the camshaft profile, ensuring optimal performance and reliability. Ideal for street rods, weekend cruisers, and mild race applications where an aggressive idle and strong acceleration are desired.

Products specifications

Fits

Pontiac GTO 1964-73, Firebird 1967-81, Grand Prix 1962-81, Grand Am 1973-75, 1978-80, Bonneville 1957-81, LeMans 1963-81, Catalina 1955-81, Tempest 1961-70, Ventura 1960-61, 1971-75, 1977, Parisienne 1967-68, 1972-74 + 27 more models

Advertised Exhaust Duration

305

Basic Operating RPM Range

2,200-6,100

Cam Type

Hydraulic Flat Tappet

Exhaust Duration at .050 inch Lift

249

Camshaft Material

Cast Iron

Kit Type

K-Kit - Complete Kit

AMAZON ASIN

B005H89TE8

Engine Family

Pontiac 265-455 C.I. 8 Cylinder (1955-1981)

Assembly Lubricant Included

Yes

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

Intake Duration at .050 Inch Lift

235

Lifters Included

Yes

Intake Valve Lift

0.49

LOBE SEPARATION

107

Valve Springs Included

Yes

Usage

Street/Strip

Exhaust Valve Lift

0.475

Advertised Intake Duration

287

Camshaft Series

Thumpr

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

Cheapest place I found for High Performance Rotors. :)

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.

very good

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

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