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Ford Performance Turbo-Swirl GT40X Aluminum Head - 64CC Chamber (82-85 5.0L; 87-95 5.0L)

Market Price $659.97 You Save 9% ($60.00)

$599.97 (each)

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  • Item 50241
  • MPN# M-6049-X306

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Features, Video & Details

  • Bolt on 65 More Horsepower
  • Improved Air Flow Over Original GT-40 Heads
  • Combustion Chamber Volume 64cc
  • 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

Hello and welcome back to Stage 3 of AmericanMuscle’s project Foxbody, as you can see we’re currently out enjoying the fruits of our labor which took place in the first two stages, and for the first time since we started this project, I can honestly say I’m not embarrassed to be out driving it. Of course a part of that lack of embarrassment is because we haven’t pulled up to anything fast yet, there’s no doubt our GT is looking good, but what’s the point of having all those Cobra parts if we don’t have the performance to back it all up, well, welcome to stage 3 my friends, where all of that is about to change. Before we get back to the shop where we lay out our plans to increase our tire slaying abilities, let’s recap what we knocked out in stage 2. In stage 2 we completely replaced our destroyed factory convertible top, with a brand new top and rear glass, along with just about every piece of molding and weather stripping you can think of, we put the finishing touches on our convertible Cobra vision, thanks to our Cobra tail light covers and 10th anniversary Cobra style wheels, made possible through the 5 lug conversion kit we installed. Finally, we moved to the interior and made it look as good as our exterior, thanks to the freshly painted dash, new carpet, and other miscellaneous items making our GT look and feel like it was 1993 all over again. Alright, I can’t wait to get back to the shop to show you all the stuff we have in store for this stage, let’s get to it. As you can see we have some big plans for our 302, all with the goal of replicating the Cobra’s power plant, which is going to drastically improve our performance. For starters, we’re going big with a trio of parts from Ford Racing, all of which will do wonders for our 5.0. First up we’re looking at the Turbo Swirl GT40X aluminum heads from Ford Racing, these heads are a variation on the original GT40 heads found on the 93 Cobra, with a few improvements. For one they’re made out of lightweight aluminum versus the heavier cast iron and they’re designed to flow much better than the original GT40’s. To top it off, we’ve installed some Cobra valve covers. For us to see the biggest gains using these heads, our stock cam just isn’t going to cut it, so we’re going to go with a popular street cam, the Ford Racing E303. This hydraulic roller cam should really compliment those GT40’s, and is an excellent choice for any street car thanks to its low to mid range torque. Of course we’re still going to have that great lope at idle which should sound amazing by the way, but it’s not radical enough that we’re going to have to worry about stalling out at every red light. The cheery on top for our 302 has to be this Ford Racing intake manifold, which is getting nearly impossible to find anymore, this part, paired with our Ford Racing heads and cam, is going to allow our 5.0 to flow some serious air, and will complete our Cobra transformation under the hood. Alright, in order to move all that extra air out of the engine, we’re reworking out entire exhaust from the headers all the way back, in order to keep up with that Ford Racing theme we’ve got going on under the hood, we selected our ceramic shorty headers, which we’d already installed when we did all of our motor work, and are designed to work specifically with those GT40 heads. From there, we go to BBK’s off road H pipe which does feature mandrel bent 2.5” stainless steel tubing, and should bolt up to those shorty headers without issue. Finally, everything’s going to exit out of Flowmaster’s American Thunder Cat-Back exhaust, which features those iconic 44 series mufflers. This exhaust features 100% stainless steel constructions throughout, including 2.5” mandrel bent tubing, and those OE style polished tips. Alright I think it’s safe to say we’ve got the performance side of things pretty well taken care of, but we haven’t addressed the fact that this thing still handles like a boat. So we’re going to attack our suspension much like we did our engine, go big or go home. Ron and I are just finishing up installing the KONI STR shocks and struts, which are actually a killer set for the price. We’re pairing those up with the SR Performance lowering springs, which should lower our Fox about an inch and a half on all 4 corners. Finally, we have the car in the air, the wheels off, we figured this would be a great time to ditch those rusty old drum brakes, in favor of these brand new disks. To dial in our new Fox’s alignment, we’ve installed the SR Performance caster/camber plates, which should get everything back into spec without issue, and offer a little bit more adjustment in future if need be. Since our car is a convertible, we are losing some of the structural rigidity which comes along with having a steel roof, to help combat this, we’ve installed the SR Performance subframe connectors, this part along with our springs, shocks and struts, should take all the laziness out of our suspension, and get it handling like a sports car should. Alright, now everything’s pretty much buttoned up, we’re going to tie it together with one of our custom Bama tunes, and see if all this hard work has paid off in really cranking up the power. We’ve already grabbed our baseline run after stage 1 when we got the car back from painting, so I’m going to hop in, bury this thing one more time, and see what the improvements are. Alright, our baseline run with our 93 GT gave us 194 horsepower, and 266 ft/lbs of torque. With all of our stage 3 modifications, the car put down an impressive 279 horsepower, and 317 ft/lbs of torque, making for a solid gain of 85 horsepower over our baseline numbers. The car did even better throughout the power band, picking up as much as 103 horsepower, and 107 ft/lbs of torque, throughout the curve. With the power finally there to back up our Cobra appearance, I think it’s time for one more cruise to see how our Fox does with all its modifications. Alright, stage 3, performance, check. The car's breathing better, the tune brought it all together, and as a result, this thing has some serious balls. Here we are, we’re in the back roads, moving along at a good clip, I’d saying the car is doing quite well, it’s pretty confident, I feel confident driving it, I don’t feel like I’m going to fly off the road, which I couldn’t have said before we did all this work. The car feels good, sounds awesome, and it’s just a whole hell of a lot more fun to drive. I know some people might question this build, you know, why a convertible, why a Fox body, well, because we wanted to, I mean that’s what car building is all about, it’s doing what you want. In this case, we’ve never seen Cobra convertible Fox bodies, so we wanted to build one, and I think we did a hell of a job. So is this the last you’ve seen of this car? I don’t know, maybe, maybe not, but in the meantime, thanks for watching stage 3 of AmericanMuscle’s project Fox body.

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 64CC 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
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
GT40X HEADS

Great quality Ford product, fit and finish just like they came on car from factory. Great PAC springs that will work with most every camshaft excluding crazy big cams. Big combustion chambers great for ...

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Helpful (1)

5/5
Fresh Build, Clean Power

Ordered through a local ford shop. Shipped quicker than "All" the competition. Clean Fit, awesome detail done by ford racing and even weighs less than the v6 cast aluminum heads. These heads are aweso ...

Read More
Helpful (5)

Overall Rating 4.9 out of 5 stars
Read All 11 Reviews

Customer Photos (4) Submit Your Photo

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30 Questions / 12 Answers

Ask a Question

Are these heads compatible with the 1994 cobra lower intake

Basscat96

  • Yes they will work fine with the cobra intake.

    92GTSC

    Good Answer (0) (0)

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Total cost? Approximately how much would the total cost be for a set of the GT40x heads and installation?

TimDav95

  • Depends all on how you go about it. Heads alone are 1200. If you plan on doing a cam at the same time to get more out of your heads, it would be an additional 200. To upgrade your intake can be around 600. headers to fit these heads are around 250 unless you want ceramic which are more. Set of roller rockers would run you another 180. Plus gaskets bolts and push rods would be another 300. So as a total 2730 would help get the most out of these heads. installation time all depends on the shop and how much you get them to do.

    Nickster

    Good Answer (0) (0)

Show 2 more answers Question Resolved

Are these heads setup to use with the thermactor system? I have a 89 notch 5.0L

99chromegt

  • The heads are not marked as off-road use only so they should be compatible with all the OEM emissions equipment.

    clowe1965

    Good Answer (0) (0)

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I am using a b303 cam with 1.6 ratio roller rockers. Will the valve springs on these heads capable of .500 lift or will i need to get new springs.

TimmyT

  • The FRPP springs will be enough for the B303 and 1.6's. They are made to match FRPP cams

    AgentSVT

    Good Answer (0) (0)

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do you need specific headers for the aluminum gt40x heads I know the gt40p heads need new headers but need to know about the gt40x heads I am buying soon

ecclec01

  • The gt40x heads use any stock style replacement header unlike the p heads.

    Runningstang2004

    Good Answer (0) (0)

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Are these heads suitable to work on either side? I am working with a budget here so that's the reason for my question. $1,200 is a little difficult to come up with all at once so I will have to buy a set on a one at a time basis......Sooooo, are these heads interchangeable to either side of the block without causing the intake and exhaust valves to be in the wrong position on one side. By looking at the picture of the head, one side would have the valves in the opposite position than the other side.

JD53

  • Yes they work on both sides. I run them they are great.

    92GTSC

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Customer Reviews (11) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Full Day

Installation Cost:$500-$1000

  • Performance Gain 4.636364 4.6
  • Fit 4.909091 4.9



  • 5/5

    Installation Time: Weekend

    July 01, 2016

    GT40X HEADS

    Great quality Ford product, fit and finish just like they came on car from factory. Great PAC springs that will work with most every camshaft excluding crazy big cams. Big combustion chambers great for forced induction cars. If staying N/A recommend getting 58cc to keep compression up. Flow devent, not best but I prefer genuine Ford Parts. Would definitely buy again. Fast delivery as with all AM parts.

    Black462

    Year: 1993 Submodel: Cobra

    Helpful (1) (0)

  • 5/5

    July 11, 2012

    roller rockers

    you will need 1.60 PEDESTAL roller rockers to fit.

    roush500

    Year: 1995 Submodel: GT Sarasota, FL, USA

    Helpful (5) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 16, 2012

    Fresh Build, Clean Power

    Ordered through a local ford shop. Shipped quicker than "All" the competition. Clean Fit, awesome detail done by ford racing and even weighs less than the v6 cast aluminum heads. These heads are awesome!!!

    St33zy

    Year: 1998 Submodel: Other Hampton, Va

    Helpful (5) (0)

  • 5/5

    Installation Time: Afternoon

    April 26, 2013

    more than expected!!!!

    I was expecting some heads to arrive that were as heavy as the stock heads and that would perform a little better than stock. man was I wrong. these gt40x heads weigh half as much as stock and way out perform them. along with the ford racing e303 cam and shorty headers in saw a 115 rwhp gain on the dyno. the icing on the cake is that now my stang just sounds meaner than ever.

    supersleeper

    Year: 1993 Submodel: GT vidalia, GA

    Helpful (2) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    December 12, 2014

    Would I reccomend? Yes and No

    Silky smooth install. Good quality parts. If you do not plan on porting these heads I would recomend going with the Edelbrocks that AM offers. Although they are a little more expensive they flow much better on paper. With that being said I think these heads flow excellent. I can hear the difference in air that my engine gets now. If I could go back in time I would order these heads again

    Dmcj

    Year: 1995 Submodel: GT bay area

    Helpful (1) (0)

  • 5/5

    Installation Time: Full Day

    June 22, 2014

    Great fit

    This heads arrived insanely fast. I think it was like two days. And wow what a difference these made!

    88Mustangg

    Year: 1988 Submodel: Other Redding, CA, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    May 08, 2014

    Very nice setup

    I read tons of reviews and forum discussions but it came down to price for me I bought one head new and the other new but open package on Ebay and for about $700 I have a set of aluminum heads that blow away the stock anchors. I havent had the car out for a full pass yet but sure does seem a lot more alive I do want to mention that the chambers needed some cleaning up any novice can do it I have porting experience and the tools but just gave them a quicky.

    DanLINY

    Year: 1990 Submodel: Other Long Island, New York, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    December 20, 2013

    great pricing

    the web site was easy to use and the pricing was great. not installed yet doing a whole engine rebuild this spring. looking forward to breathing more life and power into my car.

    bret1966

    Year: 1995 Submodel: GT Oklahoma City, OK, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Weekend

    March 21, 2013

    Great heads for the money!

    I make over 450 HP at the wheels using these heads on my 110,000 original 302 with a procharger P1SC, F Cam and GT40 intake.

    92GTSC

    Year: 1992 Submodel: GT Dayton, OH, USA

    Helpful (1) (0)

  • 4/5

    Installation Time: Weekend

    January 24, 2014

    Finishing off the top end

    Installed in about a weekend. everything fit nicely. Only negative comment is the packaging for an expensive machine piece the packaging left a lot of opportunity for damage in shipping.

    Mustangc97

    Year: 1991 Submodel: GT

    Helpful (0) (1)

  • 5/5

    Installation Time: Afternoon

    June 08, 2016

    Upgrade hp

    My head gasket recently blew! So instead of just cleaning it up and replacing the gaskets And possibly paying to machine the stock boat anchors.I decided to spend the extra money and go for a weight reduction and hp gain and yes it worked out! They look great and I can feel the extra ponies when I hit the gas!

    ARYAN0808

    Year: 1982 Submodel: GT

    Helpful (0) (1)

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