$7,000 Summertime Mustang Build Enter Now!
Talk to a Mustang Expert
1-888-332-7930
Mon-Sun 8:30 AM - 11:00 PM EST

Free Shipping On Orders Over $49. Details

Ford Performance Turbo-Swirl GT40X Aluminum Head - 58CC Chamber (82-85 5.0L; 87-95 5.0L)

Market Price $689.99 You Save 13% ($90.02)
Our Price

$599.97 (each)

FREE Shipping
  • Item 50542
  • MPN# M-6049-X307

In Stock Ships same business day. Choose options to add to cart

Features, Video & Details

  • Bolt on 65 More Horsepower
  • Improved Air Flow Over Original GT-40 Heads
  • Combustion Chamber Volume 58cc
  • Intake Port Volume 178cc, Exhaust Port Volume 62cc
  • Lightweight Aluminum
  • Fully Assembled
  • Fits 1982-1985, 1987-1995 Windsor-Style 5.0L V8s
  • Sold Individually

Review & Installation Video

Review & Install Video

More Power. Increase the horsepower and torque output of your push rod 5.0L engine with the Ford Racing Turbo-Swirl GT40X Aluminum Head. These GT-40X heads feature a 58CC Combustion Chamber to greatly improve the airflow over the original GT-40 design allowing you to bolt on 65 more horsepower.

Improved Air Flow. These Ford Racing GT-40X heads have an intake port volume of 178cc allowing for an intake flow of approximately 240 cfm at .550" lift (at 28" of H20) and an exhaust port volume of 62cc allowing for an exhaust flow of approximately 170 cfm at .500" lift (at 28" of H20). Machined for 1.94" Intake and 1.54" exhaust valve diameters.

Lightweight. Made from high quality original equipment style 356-T6 aluminum castings, each head weighs in at only 22 lbs. that is 25 lbs. lighter than the original cast iron GT-40 head, that is a weight savings of 50 lbs.

Fully Assembled. Leak tested prior to assembly, each Ford Racing Turbo-Swirl GT40X Aluminum Head comes fully assembled with M-6507-J302 intake valves, M-6505-G302 exhaust valves, and M-6513-A50 valve springs. As an added bonus the valve springs are compatible with all Ford Racing roller camshafts.

Installation Notes. Ford racing "X" heads are designed to use either GT-40 or aftermarket performance intake manifolds, M9439A50 intake gasket, and AGSF-32C spark plugs. Designed for bolt-down rocker arms part number M-6564-B351 for a 1.6 ratio or use part number M-6564-A50 for a 1.7 ratio.

Application. The Ford Racing Turbo-Swirl GT40X Aluminum Head is designed to be a direct bolt-on for the 1982-1985 and 1987-1995 5.0L Windsor-style V8 engines. It will not fit 1986 5.0L with flat-top pistons unless pistons are notched for valve relief.

Technical Note. Be sure to check your intake manifold for port match, because not all intakes are compatible due to the tall high-flow ports.

Fitment: 1982 1983 1984 1985 1987 1988 1989 1990 1991 1992 1993 1994 1995 Details

What's in the Box
  • (1) Assembled cylinder head
Installation Info
Tech Specs
Will it fit my Mustang?
  • Cobra - 94, 95
  • Foxbody - 82, 83, 84, 85, 87, 88, 89, 90, 91, 92, 93
  • GT - 94, 95

Fits 5.0L Ford V8 engines. It will not fit 1986 5.0L with flat-top pistons unless pistons are notched for valve relief

Most Helpful Reviews

5/5
Ford Racing GT40X heads

Ready to rock right out of the box with no additional parts needed besides gasket and head bolts. Direct bolt on for my 95 cobra 5.0 and worked with the factory 1.7 roller rockers. Felt the power instantly, ...

Read More
Helpful (1)

3/5
GT40X Heads

I am a Ford Mustang fanatic!!! I have installed the GT40X Aluminum Heads-58cc on my 89 Fox Body, I am a bit annoyed with the fact that Ford milled the bottom of these heads to much that you have to buy ...

Read More
Helpful (0)

Overall Rating 4 out of 5 stars
Read All 2 Reviews

Customer Photos (5) Submit Your Photo

View All 5 Photos

You Might Also Like

15 Questions / 6 Answers

Ask a Question

I want to install these on my 90 LX, 5spd. Just need to now if they are smog legal!

Greg

  • Hi, These GT40x heads are not smog legal.

    Chris J

Helpful (1)

have a 86 20thou over carbed 351w with a mild rv cam in a AC cobra replica...would these be a good addition for this motor...running stock iron heads now...if yes what would also recommended for these heads(intake,cam,etc.) thanks steve

steve

Both heads for $600 ?

SteveG

  • You will need to purchase two (2) of the Ford Performance Turbo-Swirl GT40X Aluminum Head. One GT40 Head is $599.97. Two of them will equal $1,199.94.

    AshleyK

Helpful (0)

Will this head work on a 89 5.0 with a b303 cam and stock Legnth pushrods and 1.6 roller rockers with a 3/8" stud.

Tyler

  • Hello! These Ford Performance Turbo-Swirl GT40X Aluminum Head - 58CC Chamber should work great with your setup!

    Ryan H

Helpful (0)

Hi. I'm planning to install these heads on a 85 302. The engine has a B-303 cam in it. I'm also plan to install Crane 1.7 rollers in it. Will this work ? Thanks. HT

HenryT

  • This should be able to work with the 1985 with the 302 because it is very similar to the 1987-1993 engine.

    KevinD92

Helpful (0)

Would this fit an 86 gt?

Smokn86

  • An 86 GT has flat top pistons with no valve reliefs. Because of this, you will have piston to valve clearance issues with these heads.

    AshleyK

Show 1 more answer Helpful (0)

More Products You Might Like

Customer Reviews (2) Write a Review

Overall Rating 4.0

out of 5 stars

Installation Time:Full Day

  • Performance Gain 4.5 4.5
  • Fit 3.5 3.5



  • 5/5

    Installation Time: Full Day

    January 16, 2015

    Ford Racing GT40X heads

    Ready to rock right out of the box with no additional parts needed besides gasket and head bolts. Direct bolt on for my 95 cobra 5.0 and worked with the factory 1.7 roller rockers. Felt the power instantly, can't wait to get it to the Dyno and see what the numbers say. Great product and made it to my doorstep super fast like always. Thanks AM

    BuellWillie

    Year: 1995 Submodel: Cobra La Vernia, TX 78121, USA

    Helpful (1)

  • 3/5

    May 19, 2017

    GT40X Heads

    I am a Ford Mustang fanatic!!! I have installed the GT40X Aluminum Heads-58cc on my 89 Fox Body, I am a bit annoyed with the fact that Ford milled the bottom of these heads to much that you have to buy a shim kit for your roller rockers to perform properly so that the valve will open and close to build up compression to start the engine. Sad that Ford didn't test this issue when designing these heads. These heads are suppose to be a direct bolt on with no issues as advertised everywhere!!! So waiting on the shim kit to get my Fox back on the strip!! Thanks American Muscle for having "Jeff" that is very knowledgeable on this problem and helped us out!!!

    JosephR

    Year: 1989 Submodel: GT

    Helpful (0)

Related Mustang Categories