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Author Topic:   GT40 vs. GT40P Heads
Kaiser J. Braham, III
posted 01-27-2005 10:40 PM           Edit/Delete Message   Reply w/Quote
What is the difference between a set of GT 40 heads and GT 40P heads ??? Is it the valves ??? What is the specific difference(s) ???

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Posts: 898
From: Lakewood, CO, USA
Registered: Jun 2001

posted 01-28-2005 10:18 AM     Click Here to See the Profile for JCQuinn@work   Click Here to Email JCQuinn@work     Edit/Delete Message   Reply w/Quote
The most important difference is the placement of the spark plug in a more centralized position in the combustion chamber. The P head has the plug positioned to optomize the flame front. These are called "fast burn" heads by some. The effect is more efficient combustion, more power and reduced emissions. When using the P head you should require less total ignition lead. I will find out how much less sometime this year when I fire up my P headed engine.

I think the exhaust valve is slightly smaller due to a slightly better port. I may be remembering wrong though, I do not have any reference material here.


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Kaiser J. Braham, III
posted 01-28-2005 12:07 PM           Edit/Delete Message   Reply w/Quote
Thanks !!!

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From: Delta BC Canada
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posted 01-30-2005 10:29 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
And they don't fit with most headers or exhaust manifolds. Plugs sit almost straight out rather than at a big angle.

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capri man

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From: doerun, ga.
Registered: Nov 2000

posted 01-31-2005 09:27 AM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
go here click on articles and scroll down to the gt40p article. the best article i have ever seen on them. they are great little heads but you do have to have P-specific headers. good luck

mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft.
M&M member #839

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