Mustang Ford Racing GT40x Cylinder Head 58cc (79-95) by Ford Performance

Mustang Ford Racing GT40x Cylinder Head 58cc (79-95) 5.0L/5.8L

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  • Ford Racing Mustang Ford Racing GT40x Cylinder Head  (79-95) 5.0L/5.8L M-6049-X307
Mustang Ford Racing GT40x Cylinder Head 58cc (79-95) 5.0L/5.8L

Increase horsepower in your 5.0L/5.8L Mustang with Ford Racing's aluminum GT40X 58cc cylinder head for the small block Ford!

Item #M6049X307
MPN# M-6049-X307

Everyday Low Price: $599.95

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  • Increase Horsepower
  • Increased Torque
  • Reduced Weight


  • Aluminum Construction
  • 3-Angle Valve Job
  • Pedestal Mount Head
  • Fits Most 302(5.0L) Or 351(5.8L) Small Block Ford
  • 178Cc Pedestal Mount Cylinder Head with 58Cc Combustion Chamber

What's in the Box

  • (1) Cylinder Head

Made in the USA

Product Description

Ford Racing GT40X Cylinder Head
Add this Ford Racing GT40X cylinder head to your 5.0/5.8 Mustang motor for more horsepower and torque! These cylinder heads flow up to 185 CFM right out of the box! This cylinder head was designed to flow more air and create more performance for your Mustang! Adds up to 65 horsepower. Assembled with beehive springs. This head is sold individually. This Mustang cylinder head is NOT C.A.R.B. legal.

Technical Info
Brand: Ford Racing
Manufacturer's Part Number: M-6049-X306
Cylinder Head Style: Assembled
Cylinder Head Material: Aluminum
Combustion Chamber Volume (cc): 58cc
Intake Runner Volume (cc): 178cc
Exhaust Runner Volume (cc): 62cc
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Valve Diameter (in): 1.940 in.
Exhaust Valve Diameter (in): 1.540 in.
Outside Diameter of Outer Spring (in): 1.500 in.
Number of Springs Per Valve: Single
Rocker Arms Included: No
Guideplate Pushrod Size: 5/16 in.
Accessory Bolt Holes Drilled: Yes
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Quantity: Sold Individually

Installation Notes
- Must use head bolt kit M6065D289 to install cylinder heads on 289/302 blocks
- Use intake gasket M9439A50
- Check rocker arm clearance to valve springs with production rocker arms.
- Check your intake manifold for port match, not all intakes are compatible due to the tall high-flow ports.
- Requires AGSP32C Motorcraft spark plugs.

- Fits 1979-1995 Mustang 5.0/5.8 Motors
- Will not fit 1986 5.0L with flat-top pistons unless pistons are notched for valve relief

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  • Product Videos

    How To Install 302/351 Mustang Cylinder Heads and Valvetrain (79-95)

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    About This Brand

    Ford Performance
    Ford Performance - Mustang Ford Racing Parts
    Ford Performance Parts is the leader in performance parts and accessories for Mustang and Ford Lightning. is proud to offer Ford Racing Performance Parts for your project. Ford Racing is dedicated to manufacturing the highest quality products offered in the industry. Choose from suspension, exhaust, wheels, and other performance parts at If you want the best for your Mustang or SVT Ligtning, look no further than Ford Performance Parts!

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