Mustang Ford Racing GT40x Cylinder Head 64cc (79-95) by Ford Performance

Mustang Ford Racing GT40x Cylinder Head 64cc (79-95) 5.0L/5.8L

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  • Ford Racing Mustang Ford Racing GT40x Cylinder Head (79-95) 5.0L/5.8L
Picture of Ford Racing Mustang Ford Racing GT40x Cylinder Head (79-95) 5.0L/5.8L

Increase horsepower in your 5.0L/5.8L Mustang with Ford Racing's aluminum GT40X 64cc cylinder head for the small block Ford!

Item #M6049X306
MPN# M-6049-X306

Everyday Low Price: $649.99

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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 64Cc 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): 64cc
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)

    Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

    Customer Photos (11)

    Product Reviews (3)

    out of 5 stars
    4.5 stars
    3 reviews
    5 stars    2
    4 stars    1
    3 stars    0
    2 stars    0
    1 star    0

    3 of 3 REVIEWS
    3 of 3 REVIEWS

    5 Stars   Gt40X
    By on 2/27/2014
    Image uploaded by Jacob Stockdale Bought these and I can't wait to put the heart back in my fox the gt40X heads with 1.6 SVO roller rockers I'm excited

    Yes, I would recommend this item to a friend!

    Was this review helpful to you?

    5 Stars   Love these heads, had a budget love them.
    By on 2/24/2016
    These heads E303 cam Trickflow street burner intake 24 lbs injectors 70 mm bbk tb 75mm ProM mass air bbk headers flowmasters it dynoed 357 at the wheels.

    Yes, I would recommend this item to a friend!

    Was this review helpful to you?

    4 Stars   Excellent fit, decent gains
    By on 6/30/2015
    Image uploaded by david r. Have been running these heads for the past year. I have a 95 gt with full bolt ons, stock bottom end, ProProd intake, E303, and everything is fully supported in my valve train, ignition, and fuel. I made 290 330. These are really nice heads but unless you plan on porting them or using them with nitrous I would recomend the trickflow top end kit or AFR 205s. The stock intake will not work with these heads, you need either gt40 or aftermarket. If you want to make serious power go with AFR 205s. By the way the quality of these heads is very good. I daily drive my car and bought these heads for that reason.

    Yes, I would recommend this item to a friend!

    Was this review helpful to you?

    Vehicle Applications

    Ford Mustang - 1979 (79) - 1980 (80) - 1981 (81) - 1982 (82) - 1983 (83) - 1984 (84) - 1985 (85) - 1986 (86) - 1987 (87) - 1988 (88) - 1989 (89) - 1990 (90) - 1991 (91) - 1992 (92) - 1993 (93) - 1994 (94) - 1995 (95)

    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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