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COMP Cams 48-601-10 Mutha' Thumpr 4/7 Swap Hydraulic Roller Camshaft 235/249

Manufacturer

Picture for manufacturer COMP Cams

Part Number

48-601-10
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Sale Price

$776.95

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Product Details

The COMP Cams 48-601-10 Mutha' Thumpr is a high-performance hydraulic roller camshaft engineered specifically for Chevrolet 348-409 cubic inch W-series engines from 1958-1965. This specialized camshaft features a 4/7 swap firing order design that switches the traditional firing sequence to 1-8-7-3-6-5-4-2, delivering a broader torque curve, reduced crankshaft deflection, and improved power delivery characteristics.

Key Specifications:

  • Intake Duration @ .050": 235 degrees
  • Exhaust Duration @ .050": 249 degrees
  • Advertised Intake Duration: 291 degrees
  • Advertised Exhaust Duration: 311 degrees
  • Intake Valve Lift: 0.574"
  • Exhaust Valve Lift: 0.558"
  • Lobe Separation Angle: 108 degrees
  • Grind Number: 47S 291MTHR-8
  • RPM Operating Range: 2,200-6,200
  • 3-Bolt Camshaft Gear Attachment

Performance Features:

  • Hydraulic roller design for reduced friction and increased durability
  • Aggressive "thumping" idle characteristic that defines the Mutha' Thumpr series
  • 4/7 firing order swap requires only swapping #4 and #7 ignition wires—no additional engine modifications needed
  • Delivers exceptional street/strip performance with strong mid-range to upper RPM power
  • Designed for high-performance street and strip applications

Recommended Setup:

  • Minimum 9:1 compression ratio
  • 2,500+ RPM stall converter
  • Performance intake manifold
  • Aftermarket gears
  • Header exhaust system
  • Upgraded valve springs required (sold separately)

This camshaft produces a very rough, aggressive idle that delivers the signature muscle car sound enthusiasts demand while providing substantial horsepower and torque gains throughout the powerband. Assembly lubricant is included for proper installation.

Products specifications

Advertised Exhaust Duration

311

Advertised Intake Duration

291

Intake Valve Lift

0.574

Exhaust Valve Lift

0.558

Exhaust Duration at .050 inch Lift

249

Grind Number

47S 291MTHR-8

Engine Family

Chevrolet 348-409 c.i. 8 Cylinder (1958-1965)

Camshaft Series

Thumpr 4 and 7 Swap Firing Order

Assembly Lubricant Included

No

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.

Basic Operating RPM Range

2,200-6,200

Camshaft Gear Attachment

3-Bolt

Lifter Type

Hydraulic Roller

Intake Duration at .050 Inch Lift

235

Cam Type

Hydraulic Roller

Camshaft Material

Billet Steel

LOBE SEPARATION

108

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Love shopping here, I always find what I need.

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Quick Purchase, very good.

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