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289 or GT40 heads on my 302?
#324440 September 04th 2009 10:05 pm
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What is better performance wise, 289 Closed Chamber or GT40 heads? I can get GT40's a good deal but want to know what I can get more performance and HP out of. I am planning on porting and polishing them either way I go.

Last edited by Twisted; September 04th 2009 10:10 pm.

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Re: 289 or GT40 heads on my 302?
Twisted #324638 September 07th 2009 8:17 pm
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I would recommend getting a set of heads off of a late 80s truck or van 302. These are the high performance heads put on GT Mustangs in the late 80s, but should be much cheaper. I wouldn't even bother porting and polishing in a van. If I understand head flow correctly, in a heavy vehicle that turns low RPMs, you want stock size port to increase port velocity.


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Re: 289 or GT40 heads on my 302?
Reed #324683 September 08th 2009 3:32 am
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What Reed is referring to would be E7 (E7TE) heads. They are very popular with the Crown Victoria crowd (also heavy vehicles!). The GT40/GT40P heads are acknowledged as better performers, though. They came from the factory on Explorers and Mountaineers, which also need a good bottom end.


Steve
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Re: 289 or GT40 heads on my 302?
SteveS #324819 September 08th 2009 2:47 pm
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Thanks for correcting me! I know just enough about Fords to be dangerous, but not enough to be an expert.


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Re: 289 or GT40 heads on my 302?
SteveS #324848 September 08th 2009 4:54 pm
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Twisted Offline OP
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Originally Posted by SteveS
What Reed is referring to would be E7 (E7TE) heads. They are very popular with the Crown Victoria crowd (also heavy vehicles!). The GT40/GT40P heads are acknowledged as better performers, though. They came from the factory on Explorers and Mountaineers, which also need a good bottom end.

Yeah, I actually was looking at GT40's off an explorer. I think the years were 1996-1997 GT40's and about 1998-2001 was GT40P's


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Re: 289 or GT40 heads on my 302?
Twisted #324851 September 08th 2009 5:07 pm
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Re: 289 or GT40 heads on my 302?
Twisted #324852 September 08th 2009 5:08 pm
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Hey Twisted!! The GT-40P Heads have a different spark plug angle then all the other small block Heads. Just thought I'd let you know that. Headers?? Don't know where you would find any.
I had a set on a NICE 5.0 and MAC was the only one at the time who had Headers for these heads. You could try the Factory Manifolds from the Explorers, but this is something I've never tried. Good Luck and oh ya.... I LOVE YOUR VAN!!! Later Man, Kev- cool

Re: 289 or GT40 heads on my 302?
Kevs_Kustoms #324915 September 08th 2009 11:08 pm
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Kev's right Twisted, and those factory headers on the explorer are really restrictive do to the confined engine bay. I was lucky enough to change a set when I was still working at the dealer....horrible job.

Re: 289 or GT40 heads on my 302?
Twisted #325334 September 10th 2009 4:54 pm
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There's no way I am putting manifolds on this at all lol. I think I'll stick with the E7's for a while. If I did get them off an explorer, I would not get the GT40P's, I would get the GT40's.


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