GT40X heads - Vintage Mustang Forums
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post #1 of 12 (permalink) Old 07-04-2019, 08:06 PM Thread Starter
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GT40X heads

Does anyone have experience with the Aluminum GT40X heads. There is a set selling for $875 wondering how these compare to other aluminum heads out there and if this is fair price. This is for a 94 GT EFI roller engine

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Ford 302 gt40x SVO cylinder heads 64cc chamber original - $875

64cc. These are oem with all original ford hardware and never been resurfaced, there is some light polishing in the intake ports. The heads have approximately 22k miles on them and have excellent deck linearity. Could use some light cleaning if you want that new look. Otherwise they are in excellent working condition.

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

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.

Thanks

Flade
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post #2 of 12 (permalink) Old 07-04-2019, 09:20 PM
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i made 500 to tires on boost with them
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post #3 of 12 (permalink) Old 07-04-2019, 11:23 PM Thread Starter
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Originally Posted by strtcar View Post
i made 500 to tires on boost with them
Not bad. What motor did you have them on? What mods?

Flade
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post #4 of 12 (permalink) Old 07-05-2019, 06:58 AM
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I think the price is a bit high for used X heads. They are a decent lower end head similar to the Edelbrock E-Streets, which you can get assembled for $1,035 on Summit. I bought a pair of X heads that had never been run, with ARP head bolts & sleeve washers for $800 a year ago. The 64cc chambers will likely lose you a bit of compression, 58cc chambers are a better option.

'65 A-code coupe, T-10 4-speed, 8" 3.25 limited slip
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post #5 of 12 (permalink) Old 07-05-2019, 08:45 AM
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875 a pair isn't to bad for used heads
they have a largish 64cc vs a 60cc combustion chamber than the Edelbrock Performer 5.0 heads I got used at a similar price last year


Brad
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post #6 of 12 (permalink) Old 07-06-2019, 12:46 AM Thread Starter
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Thanks, I was concerned about the large chamber heads, seemed better suited to a car with boost. Ill keep looking for a better suited set.

Flade
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post #7 of 12 (permalink) Old 07-06-2019, 09:13 AM
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Quote:
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Not bad. What motor did you have them on? What mods?

302
e303
gt40x heads
9:1
systemax intake
s-trim 12lbs
t5
holley hp efi
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post #8 of 12 (permalink) Old 07-06-2019, 09:20 AM
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Offer a lower price and see what happens. You could always get them surfaces to bring the volume down

Tom

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post #9 of 12 (permalink) Old 07-06-2019, 04:38 PM Thread Starter
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Originally Posted by Huskinhano View Post
Offer a lower price and see what happens. You could always get them surfaces to bring the volume down
That is a thought. I wonder how much I would need to mill them to reach 60cc or less.

Flade
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post #10 of 12 (permalink) Old 07-06-2019, 04:43 PM
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Most head manufacturers have an equation and a max allowable milling to achieve a desired chamber CC.
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Regards,
Patrick
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post #11 of 12 (permalink) Old 07-06-2019, 05:25 PM
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That is a thought. I wonder how much I would need to mill them to reach 60cc or less.
Pure stab in the dark, Id guess about .020 to .030. Since the heads breath much better then a stock head your filling the cylinder much better offsetting that loss in CR is my feeling.

Tom

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post #12 of 12 (permalink) Old 07-06-2019, 07:18 PM
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Offer a lower price and see what happens. You could always get them surfaces to bring the volume down
wheeler dealer


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