determining if heads are GT40P or GT40 X.Y - Northern California Ford Owners

This is topic determining if heads are GT40P or GT40 X.Y in forum Tech Talk at Northern California Ford Owners .

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Posted by SydeWayzSix (Member # 2222) on :

I am going to pick up a set of GT40 heads, but need to make sure that they are the ones that DO NOT require special headers. The P-heads are the ones that need the specific headers, right? Also, by looking at the heads or the stamp, how would I be able to determine which model they are??

thanks [patriot]

Posted by 91 5.0 5speed (Member # 1867) on :

quote:
Originally posted by SydeWayzSix:
I am going to pick up a set of GT40 heads, but need to make sure that they are the ones that DO NOT require special headers. The P-heads are the ones that need the specific headers, right? Also, by looking at the heads or the stamp, how would I be able to determine which model they are??

thanks

Quit being so damn cheap and just by my edelbrocks! [Big Grin]

Posted by 93cobracoupestang (Member # 5765) on :

they say gt40p and have 3 lines on the back? i think.

Posted by SydeWayzSix (Member # 2222) on :

quote:
Originally posted by 91 5.0 5speed:

quote:
Originally posted by SydeWayzSix:
I am going to pick up a set of GT40 heads, but need to make sure that they are the ones that DO NOT require special headers. The P-heads are the ones that need the specific headers, right? Also, by looking at the heads or the stamp, how would I be able to determine which model they are??

thanks
Quit being so damn cheap and just by my edelbrocks!

man....I would, but thats over $500 more out of my broke ass pockets [Frown]

For this stock bottom end, I just need something a little better than stock. Once I have money to build a "real motor," I'll be in the market for some aluminum ones [patriot]

If you let them go for $300 I'll pick them up tomorrow [Wink]

quote:
Originally posted by 93cobracoupestang:
they say gt40p and have 3 lines on the back? i think.

3 lines on the back??? What do you mean [Confused]

[ April 11, 2006, 01:09 AM: Message edited by: SydeWayzSix ]

Posted by 93cobracoupestang (Member # 5765) on :

on the head there are lines that stick out im not sure how to explain it. but its obvious when you look at it. they will say gt40p and will have 3 lines im pretty sure on the back of it. somebody help me out/sidwayz out.

Posted by modular (Member # 6599) on :

The plugs go straight in and are not angled giving the reason for the special headers.

Posted by 1quik69 (Member # 5481) on :

On the edge of the head right below the valve cover it will say gt40 or gt40p or something like that on the "p" head. The 40's have 3 raised bars on the front of the head, the "p"s have 4 raised bars. The bars look like those shortbread cookies you buy.

Posted by SydeWayzSix (Member # 2222) on :

quote:
Originally posted by modular:
The plugs go straight in and are not angled giving the reason for the special headers.

So the P-head's plugs are straight, right?

Posted by 23boy5.0 (Member # 5511) on :

what are the differences in the two heads performance wise?

Posted by 93cobracoupestang (Member # 5765) on :

the "p"s flow better

Posted by vpr_klr (Member # 3353) on :

DON'T BUY P HEADS. THEY ARE JUNK(THOUGH, BETTER THAN STOCK, BUT CUSTOM HEADERS FOR SHIT HEADS!?).

THEY DON'T FLOW MORE, AT ALL.

THE REVISED PLUG ANGLE IS WHERE THE POWER IS AT. THEY USED A STRAIGHT PLUG FOR BETTER COMBUSTION IN THE LATER MODEL, OBD-II EQUIPPED VEHICLES(EXPLORER'S).

THINK ABOUT THIS, GT-40'S CAME OFF COBRA'S AND WERE SOLD IN THE FORD RACING CATALOG

WHILE THE GT-40 "P" HEADS CAME OFF EXPLORER'S AND WERE NEVER OFFERED BY FORD RACING.

WHICH ONE WOULD YOU RATHER HAVE.......

IF THEY ARE "P" HEADS, A BETTER IDEA WOULD BE TO EXCHANGE YOUR STOCK HEADS FOR CNC PORTED POWER HEADS(STILL AN E7TE CASTING).

Posted by SydeWayzSix (Member # 2222) on :

ok...I picked up the heads.

They are stamped "GT" on the corners, but do not say GT40...also, they have 3 raised bars on the backside. These are the NON "P" heads right?

Posted by forced331 (Member # 1270) on :

What you have are Standard Gt40 heads, the same as the 93 cobra.

Posted by SydeWayzSix (Member # 2222) on :

quote:
Originally posted by forced331:
What you have are Standard Gt40 heads, the same as the 93 cobra.

yeah..thats what I wanted [Big Grin]

I dont want the P-heads because I didnt want to deal with the headers [patriot]

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