How to identify gt40 heads

5.0 Fiend said:

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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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

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.

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.