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COMP Cams 33-601-11 Mutha' Thumpr 235/249 Hydraulic Roller Camshaft for Ford FE 352-428

Manufacturer

Picture for manufacturer COMP Cams

Part Number

33-601-11
14 reviews
Sale Price

$598.95

3 left at this price

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Product Details

The COMP Cams 33-601-11 Mutha' Thumpr Hydraulic Roller Camshaft brings the classic, choppy idle and aggressive sound profile of a radical solid cam to Ford FE big-block engines (352–428 cubic inch), while maintaining the everyday drivability of a hydraulic roller design. Part of COMP Cams' popular Thumpr series, the Mutha' Thumpr is engineered to deliver that signature loping, uneven exhaust note that enthusiasts love — without sacrificing street manners.

This cam features an asymmetrical lobe separation design that creates the distinctive "thumping" idle character. The hydraulic roller lifter compatibility means no valve lash adjustments, reduced valvetrain wear, and improved compatibility with modern engine oils. It is an excellent upgrade for street/strip builds seeking both performance and showmanship.

Camshaft Specifications:

  • Part Number: 33-601-11
  • Cam Series: Mutha' Thumpr
  • Lifter Type: Hydraulic Roller
  • Application: Ford FE Big Block 352, 360, 390, 406, 410, 427, 428 cu. in.
  • Advertised Duration (Intake/Exhaust): 235° / 249°
  • Duration at 0.050" (Intake/Exhaust): 194° / 210°
  • Valve Lift (Intake/Exhaust) with 1.76:1 rocker ratio: 0.524" / 0.509"
  • Lobe Separation Angle (LSA): 107°
  • Grind Number: 11

Key Features:

  • Produces the classic "Thumpr" loping idle sound on Ford FE big-block engines
  • Hydraulic roller design eliminates the need for periodic valve lash adjustments
  • Asymmetric lobe profile delivers a distinctive, aggressive exhaust note
  • Improved high-RPM performance over stock camshaft profiles
  • Compatible with COMP Cams hydraulic roller lifters and related valvetrain components
  • Ideal for street/strip, hot rod, and restomod Ford FE builds

The COMP Cams Mutha' Thumpr series is a favorite among Ford FE enthusiasts looking to transform the personality of their engine. Pair this camshaft with matching hydraulic roller lifters, pushrods, and valve springs (sold separately) for optimal performance and longevity.

Products specifications

Advertised Exhaust Duration

311

Advertised Intake Duration

291

Basic Operating RPM Range

2,200-5,900

Grind Number

291THR7

Engine Family

Ford 352-428 c.i. 8 Cylinder (1963-1977)

Exhaust Valve Lift

0.551

Intake Valve Lift

0.567

Exhaust Duration at .050 inch Lift

249

Cam and Lifter Kit Upgrade

CL33-601-11

K-Kit Upgrade

K33-601-11

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

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SMOOTH TRANSACTION- you wont find all the items you need all in the same place elsewhere

easy deal!!

Need them fast

EZ PZ, This entire transaction went flawlessly, from ordering, to receiving on my doorstep, quicker than had anticipated. I just opened the box today, one day after receiving, just to make sure there was a battery in it. The only thing left to do is insta

Ordered wrong item. Trying to return.

Easy checkout. Thanks.

Amazing shipping speed!!!!! Best price on internet! Item arrived as described. Will do business again!

EASY TO ORDER

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I found what I wanted and it was overall a pleasant experience.

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