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 CL51-601-5 Mutha' Thumpr 235/249 Hydraulic Flat Cam and Lifter Kit for Pontiac V8

(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 + 27 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

CL51-601-5
6 reviews
Sale Price

$463.95

Estimated ship date Saturday, November 21

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 Mutha' Thumpr CL51-601-5 is a complete hydraulic flat tappet camshaft and lifter kit engineered specifically for Pontiac V8 engines (265-455 cubic inches). This aggressive cam delivers the iconic Thumpr sound with excellent low-end torque and a lopey idle that makes a bold statement at the stoplight.

Camshaft Specifications:

  • Advertised Duration: 235° Intake / 249° Exhaust
  • Duration at .050": 223° Intake / 235° Exhaust
  • Valve Lift: .462" Intake / .470" Exhaust (with 1.5 rocker ratio)
  • Lobe Separation Angle: 112°
  • Recommended RPM Range: 1,200-5,400 RPM
  • Hydraulic flat tappet design for durability and ease of maintenance

Complete Kit Includes:

  • Mutha' Thumpr hydraulic flat tappet camshaft
  • 16 hydraulic lifters
  • Assembly lube for proper break-in
  • Installation instructions
  • COMP Cams decals

This cam kit is ideal for street/strip applications where you want aggressive sound and throttle response with strong mid-range power. The Mutha' Thumpr profile produces more duration than the standard Thumpr series, resulting in an even more aggressive exhaust note and increased performance potential. Recommended for engines with aftermarket torque converters (2,400+ stall), upgraded valve springs, and headers for optimal performance.

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, 1972-75, 1977, Grandville 1971-75 + 24 more models

Advertised Exhaust Duration

305

Basic Operating RPM Range

2,200-6,100

Cam Type

Hydraulic Flat Tappet

Kit Type

Cl-Kit - Cam and Lifter Kit

Exhaust Duration at .050 inch Lift

249

Camshaft Material

Cast Iron

AMAZON ASIN

B005H89WCM

Engine Family

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

Assembly Lubricant Included

Yes

Camshaft Gear Attachment

1-Bolt

Valve Springs Required

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

Locks Included

No

Intake Duration at .050 Inch Lift

235

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

No

Intake Valve Lift

0.49

LOBE SEPARATION

107

Usage

Street/Strip

Exhaust Valve Lift

0.475

Advertised Intake Duration

287

Valve Stem Seals Included

No

Camshaft Series

Thumpr

Great price and fast shipping, beat auto anything by a mile.

Fast shipping, great product. Nothing more needs to be said.

Nice

Autoplicity was quick and easy. Painless web format. Shiped right away. And reasonably priced too.

Great communication, Great prices! They beat all the competitors hands down on price for my cold air intake order #18986. Quick shipping and they are now in my favorites for places to look for automobile needs. The only thing I would like to see them change is the speed of their website.

Cheap prices, great quality, and fast delivery. Autoplicity will continue to receive my patronage.

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