GT40, GT40P, performance heads
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Tuned
Joined: Jul 2004
Posts: 476
Likes: 5
From: Delaware
GT40, GT40P, performance heads
What is the difference between the GT40 and GT40P heads? I've read that the GT40P heads require different headers or exhaust manifolds than the rest of the cylinder heads, what's the difference with them? In my quest for more performance for my 90 Bronco with 302FI I'm looking at other heads for it. Before I go to the salvage yard I need to know what I'm looking for. I'd like to go with the Ford or Edelbrock aluminum heads but they may be out of my budget so I was looking at the Ford GT40 cast heads. I have the E7TE heads on it now with some porting, should I just stay with them and increase the valve size from the 1.78" intake/1.46" exhaust up to 1.84"/1.54" or just look for something better?
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
I have the "P" heads, they are a bit of a redesign. For one thing, they have oval exhaust ports rather than square, and as RTM said, the plugs are angled differently, they are actually straighter and that's what causes the header interference, but not with all headers. I tried several different sets that I have to see what the problems were, and found quite a few different clearance issues.
Here are some links to the most informative sites I have found regarding these heads:
http://www.stangpro.com/html/article...les/gt40p1.htm
http://www.themustang-net.com/tech_articles/gt40p.shtml
Hope this helps, -TD
Here are some links to the most informative sites I have found regarding these heads:
http://www.stangpro.com/html/article...les/gt40p1.htm
http://www.themustang-net.com/tech_articles/gt40p.shtml
Hope this helps, -TD
Freshman User
Joined: Feb 2005
Posts: 28
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The bolt pattern for the exhaust manifolds on the "P" heads is different from all other Windsor engines. It is diagonal and requires matching exhaust manifolds. You WILL NOT be able to use your existing manifolds with these heads.
Cargo Master
Joined: Dec 2003
Posts: 2,735
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From: Sunny Florida
Originally Posted by Hawkeye77
The bolt pattern for the exhaust manifolds on the "P" heads is different from all other Windsor engines. It is diagonal and requires matching exhaust manifolds. You WILL NOT be able to use your existing manifolds with these heads.
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
This is definitely not true. As I said, I have the P heads and several sets of old headers laying around, most of which were made before the P heads were introduced. Also bolted up a pair of factory shorties from an '88 Mustang, all of them bolt up just fine, the only differences are the port shape and the plug angle. If you click on the first link in my earlier post and scroll down the page, you will see pics of the P head ports. Pretty clear that the bolt pattern is the same. Perhaps you were thinking of some of the aftermarket heads? -TD
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