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COMP Cams GK35-602-4 Big Mutha' Thumpr Hydraulic Flat Camshaft Kit for Ford 351W

(Ford F-150 1981-95, Mustang 1969-95, F-250 1981-95, Bronco 1981-95, Thunderbird 1977-79, F-350 1981-95, Galaxie 500 1969-74, F-100 1981 + 37 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

GK35-602-4
4 reviews
Sale Price

$700.95

Estimated ship date Friday, November 20

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Product Details

The COMP Cams Big Mutha' Thumpr GK35-602-4 is a complete hydraulic flat tappet camshaft kit engineered specifically for Ford 351 Windsor engines. This aggressive performance camshaft delivers the iconic Thumpr loping idle and massive low-end torque that enthusiasts crave, with 243/257 degrees of advertised duration for a radical sound and strong throttle response.

Camshaft Specifications:

  • Advertised Duration: 243°/257° (Intake/Exhaust)
  • Duration at .050": 224°/236° (Intake/Exhaust)
  • Valve Lift: .501"/.510" (Intake/Exhaust) with 1.6:1 rocker ratio
  • Lobe Separation Angle: 107°
  • Hydraulic flat tappet design for reliable street performance
  • Aggressive loping idle with strong vacuum signal

Complete GK-Kit Includes:

  • High-performance hydraulic flat tappet camshaft
  • Matched hydraulic lifter set (16)
  • Valve springs and retainers designed for cam profile
  • Assembly lubricant and installation components
  • Detailed installation instructions

The Big Mutha' Thumpr series is designed for street/strip applications where maximum attitude and aggressive sound are priorities. This kit is ideal for muscle car restorations, hot rods, and weekend warriors running automatic transmissions with higher stall converters (2,400-3,000 RPM recommended) and rear gear ratios of 3.73:1 or steeper. The kit provides everything needed for a professional camshaft installation, ensuring proper valve train geometry and optimal performance.

This camshaft works best with aftermarket cylinder heads, performance intake manifolds, and free-flowing exhaust systems. Professional installation and proper valve train setup are recommended to achieve maximum performance and engine longevity.

Products specifications

Fits

Ford F-150 1981-95, Mustang 1969-95, F-250 1981-95, Bronco 1981-95, Thunderbird 1977-79, F-350 1981-95, Galaxie 500 1969-74, F-100 1981, F-250 Pickup 1981-95, Fairlane 1969, Ranchero 1969-79, Torino 1969-76, F-350 Pickup 1981-95 + 32 more models

Advertised Intake Duration

295

Basic Operating RPM Range

2,500-6,400

Cam Type

Hydraulic Flat Tappet

Engine Family

Ford 351W 8 Cylinder (1969-1996)

Exhaust Valve Lift

0.498

Intake Valve Lift

0.512

Intake Duration at .050 Inch Lift

243

Exhaust Duration at .050 inch Lift

257

Kit Type

GK-Kit - Cam and Gear Kit

AMAZON ASIN

B002EE566I

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

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

Yes

Usage

Street/Strip

Advertised Exhaust Duration

313

Valve Stem Seals Included

No

Pushrods Included

No

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!

It was easy and the price is good, but this is just the order. If I get the product in the same manor, that will be great. Thanks, Mike

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

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