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 Post subject: GTP HEADS
Posted: Sun Nov 16, 2008 10:55 am 
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Hi guys,

We all know the AU XR8's heads have "GT40P" stamped on them.

The EB GT / ED XR8 SPRINT / EL GT which had the GT40 heads, not GT40P, had "GTP" stamped? Is this correct?

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Posted: Sun Nov 16, 2008 11:04 am 
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I beleive they both have "GTP" cast into them. Under the rocker cover is where the 40P's will have "GT40P" cast into them.

 

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Posted: Sun Nov 16, 2008 11:08 am 
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Image

That image shows it only saying GT on the GT40 heads.




I'm know my GT40Ps have GTP stamped on them.

 

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Posted: Sun Nov 16, 2008 11:10 am 
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Nice find Timmeh :)

 

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Posted: Sun Nov 16, 2008 11:15 am 
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Just a quick search on the forum brought that up for me. :D

 

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Posted: Sun Nov 16, 2008 2:29 pm 
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Also;
GT40 heads have 3 ribs on the front face of the head.
GT40P have 4 ribs.
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Posted: Sun Nov 16, 2008 3:18 pm 
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Thats correct XR9UTE.
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Posted: Sun Nov 16, 2008 7:17 pm 
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Timmeh wrote:
Image

That image shows it only saying GT on the GT40 heads.




I'm know my GT40Ps have GTP stamped on them.

 

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Posted: Sun Nov 16, 2008 7:22 pm 
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picture of my "GTP" stamp.

 

 

Attachments:
GTP.JPG
GTP.JPG [ 148.18 KiB | Viewed 2269 times ]

 

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Posted: Sun Nov 16, 2008 7:56 pm 
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How many lines do you have on the front of them 3 or 4?

3 its GT40 and 4 its GT40P.

 

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Posted: Sun Nov 16, 2008 10:07 pm 
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Timmeh wrote:
How many lines do you have on the front of them 3 or 4?

3 its GT40 and 4 its GT40P.


Can you show me where I'm looking on the pic you supplied above?

 

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Posted: Sun Nov 16, 2008 10:16 pm 
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EL2XR8 wrote:
Timmeh wrote:
How many lines do you have on the front of them 3 or 4?

3 its GT40 and 4 its GT40P.


Can you show me where I'm looking on the pic you supplied above?


It is not shown on those pics.

On the very front and rear faces of the head there will be 3 or 4 vertical bars cast into the head.

 

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Posted: Sun Nov 16, 2008 10:23 pm 
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The lines are located on the front of the head.

If your looking at your engine from the front of your car. To the right behind the alternator on the head is some raised lines. If you have 4 lines its a GT40P head if you have 3 lines its a GT40 head.

Image

 

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Posted: Sun Nov 16, 2008 10:25 pm 
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I'm guessing you have GT40Ps going off posts in the other thread where you mention plug clearance issues.

 

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Posted: Sun Nov 16, 2008 10:53 pm 
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Yep, I got 4 bars, don't know why I was told they are 40's by the engine builder.
Thanks guys.
So to fix my clearance issues now, what headers do I need?
Cheers.

 

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