GT-40 or GT-40p

65 fastback

Founding Member

Mar 17, 2002

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Northern VA

Feb 29, 2008

#1

• Feb 29, 2008

• #1

I found a local buy of some cast iron Ford heads for a good price.

"I have a set of Gt 40 iron heads that have about 1k miles on them sice being Cleaned, ported, 3 angle valve job, milled .005", and new Trick Flow spring Kit."

The seller says they are GT-40 heads off of a '96 or a '97 Explorer. I asked if they were GT-40p's and he said no, they are true GT-40's. Did Explorers ever come with straight GT-40 heads or were they all GT-40p's?

Thanks,
Tim

 

B

bnickel

Founding Member

Aug 21, 2002

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lubbock, texas

Feb 29, 2008

#2

• Feb 29, 2008

• #2

yes, the P head was a later development for the explorer and before that they used a regular gt40 head. i can't remember the exact cutoff year though so you might do a google search or even a search for recent P head threads, i know it was mentioned in one of them

 

65 fastback

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Mar 17, 2002

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Northern VA

Feb 29, 2008

#3

• Feb 29, 2008

• #3

Thanks Bnic, I did some research and it looks like the '96-'97 Explorer heads are GT-40s. Plus there were some pictures on what to look at specifically to identify them.

I think I'm going to go ahead and get them, I think the 351 heads are my limiting factor.

Thanks,
Tim

 

65 fastback

Founding Member

Mar 17, 2002

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Northern VA

Feb 29, 2008

#4

• Feb 29, 2008

• #4

OK, next question. What are some good, inexpensive roller rockers for these heads?

Tim

 

B

bnickel

Founding Member

Aug 21, 2002

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lubbock, texas

Feb 29, 2008

#5

• Feb 29, 2008

• #5

the 93 cobra roller rockers (made by Crane cams) are inexpensive and they come used all the time on ebay too, if you'd rather go that route. they are also 1.7 rocker too so more lift from the same cam

http://store.summitracing.com/partdetail.asp?part=CRN-44746-16&autoview=sku

 

Decurion

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Sep 28, 2006

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Livonia, MI

Mar 1, 2008

#6

• Mar 1, 2008

• #6

+1 on the cobra rockers. The easiest way to tell the gt from the P heads is the gts have 3 ribs on the front, the Ps have 4. Here is a set of pictures I saved from somewhere comparing the 2.
http://s10.photobucket.com/albums/a142/1strealjeep/gt40p heads/