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COMP Cams 51-601-11 Mutha' Thumpr 235/249 Hydraulic Roller Camshaft for Pontiac 265-455

(Pontiac GTO 1964-73, Firebird 1967-77, 1979, Grand Prix 1962-73, 1975-79, Grand Am 1973-75, 1978-79, Bonneville 1958-71, 1973-79 + 14 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

51-601-11
14 reviews
Sale Price

$608.95

1 left at this price

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Product Details

The COMP Cams 51-601-11 Mutha' Thumpr Hydraulic Roller Camshaft is designed for Pontiac 265–455 cubic inch V8 engines and delivers the aggressive, loping idle and classic muscle car sound that enthusiasts demand. Part of COMP Cams' popular Thumpr series, this cam is engineered to maximize low-to-mid range torque while giving your Pontiac a distinctive, choppy idle character.

This hydraulic roller design eliminates the need for break-in procedures and provides long-term durability with reduced friction compared to flat-tappet alternatives. The asymmetrical lobe separation delivers that signature Thumpr sound without sacrificing drivability.

Camshaft Specifications:

  • Part Number: 51-601-11
  • Cam Series: Mutha' Thumpr
  • Lifter Type: Hydraulic Roller
  • Advertised Duration (Intake/Exhaust): 235° / 249°
  • Duration at 0.050" (Intake/Exhaust): 193° / 200°
  • Valve Lift (Intake/Exhaust): 0.487" / 0.480"
  • Lobe Separation Angle: 107°
  • Application: Pontiac 265, 301, 326, 350, 389, 400, 421, 428, 455 V8

Key Features:

  • Hydraulic roller lifter compatibility for easy maintenance and quiet operation
  • Aggressive lopey idle with the signature Thumpr exhaust note
  • Optimized for street and street/strip performance applications
  • No cam break-in procedure required
  • Compatible with factory or aftermarket Pontiac V8 cylinder heads
  • Designed to work with stock or mild valve spring upgrades

The COMP Cams Mutha' Thumpr series is ideal for Pontiac owners who want a noticeable performance upgrade with dramatic sound and feel, while retaining enough street manners for everyday driving. Pairing this camshaft with matched COMP Cams hydraulic roller lifters and valve springs is recommended for optimal performance.

Products specifications

Fits

Pontiac GTO 1964-73, Firebird 1967-77, 1979, Grand Prix 1962-73, 1975-79, Grand Am 1973-75, 1978-79, Bonneville 1958-71, 1973-79, LeMans 1963-74, 1976-77, 1979, Catalina 1955-79, Tempest 1961, 1963-70 + 11 more models

Advertised Exhaust Duration

311

Advertised Intake Duration

291

Basic Operating RPM Range

2,000-5,800

Grind Number

291THR7

Intake Valve Lift

0.522

Exhaust Valve Lift

0.508

Exhaust Duration at .050 inch Lift

249

Cam and Lifter Kit Upgrade

CL51-601-11

K-Kit Upgrade

K51-601-11

Engine Family

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

Assembly Lubricant Included

No

Camshaft Gear Attachment

1-Bolt

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.

Lifter Type

Hydraulic Roller

Intake Duration at .050 Inch Lift

235

Cam Type

Hydraulic Roller

Camshaft Material

Billet Steel

LOBE SEPARATION

107

Usage

Street/Strip

Camshaft Series

Thumpr

Autoplicity so far has been great place to buy online automotive stuff. Good prices and well organized.

Very pleased and will be back for my automotive parts

Great prices

easy to find and order

Thanks!!!

Good

Autoplicity was very fast and easy to oredr from. prices are great and looking forward to placing future orders.

Was nice and easy just wish there was a better product picture and more info.

great website so far so good

Autoplicity had the best price on the part I needed and was in stock. Easy ordering process and good correspondence.

Easy to search

Super fast shipping, easy to use site, would buy again from site

thanks for the quick service

Great Service

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