How to identify gt40 heads

Discussion in 'Fox 5.0 Mustang Tech' started by 5.0 Fiend, Aug 29, 2004.


  1. 5.0 Fiend

    5.0 Fiend New Member

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    I have heard of gt40 heads being a good increase over stock, and that they came on some explorers. My question is, what years did the gt40's come on explorers, and how do I identify them?
     
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  2. tjm73

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    I believe all 5.0 V8 Explorers got the GT-40P heads. Which are different from the GT-40 head. The P head has the spark plugs coming out at a different angle, which requires special headers. FRPP sells the headers you would need.

    I'm pretty sure the GT-40 heads only came on 93-95 Cobra's and some crate motors. For a long time you could buy them dirrect from FRPP (then called SVO). A couple years ago they were discontinued.

    GT-40P heads can be ID'd by the "GTP" on the head. According to this http://www.ford-fox.org/viewtopic.php?topic=619&forum=1 the GT40 has "GT" cast where the "GTP" is.

    See this link for more info on GT-40 vs. GT-40P:
    http://www.themustang-net.com/tech_articles/gt40p.shtml

    [​IMG]
     
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  3. 5.0 Fiend

    5.0 Fiend New Member

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    Thanks, that was the answer I was looking for.
     
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  4. Ourobos

    Ourobos Member

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    GT40s also came on Explorer through mid 94. GT40s have 3 bars on the end and GT stamping, instead of the 4 bars and GT40P stamping. My heads came from a 94 Explorer. The Cobra heads have a smaller combustion chamber, raising the compression, as compared to the over the counter or explorer GT40s, hence I had mine milled .025. If you get the GTs, make sure you look into better springs, unless you run the stock camshaft.
     
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  5. BadA$$88'Coupe

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    Regular GT40's came on the Explorers through 1996. After '96 they went to the GT40p heads. Im selling a set of GT40's I got off a '96 Explorer. I think some '97's had GT40's and some had the GT40p's.
     
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  6. Gearbanger 101

    Gearbanger 101 Straight Outta Locash
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    Correctamundo!!!

    Also, GT-40's have 1.84/1.54 valves versus GT-40P's 1.84/1.46 valves. As where stock E7TE heads use 1.74/1.46 valves.
     
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  7. Michael Yount

    Michael Yount Advanced Member

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    Not quite - regular GT40's came on Explorers through the first couple of months of 97 model production -- somewhere around build dates in Oct.96 the swap was made to GT40P's. That means 95, 96 and the first month or two's production of 97's had GT40's; the rest had P's. Look for the 3 parallel bars cast into the ends of the heads. I don't believe the 5.0L was available in the Explorer until the 95 model year - 94 models the only engine available was the pushrod 4.0L v6.
     
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