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Old 10-10-2012, 06:17 PM   #1
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GT40 Heads Question.

Hi,
I found a set of GT40 Heads on Ebay for $200 + S&H. Stamped E3ZE 3-Bar
The ad says the Heads are not Drilled for EGR. I'm using the GT40 Intake with the Hole for the EGR. So would I have to have the Heads drilled for the EGR ???
Not sure what to do as I'm suppose to pay for them Friday & if they have to be drilled I'm not sure I want them. Will I have the same issue no matter what GT40 or GT40P Heads I get??? All info is appreciated!!! Thx, Dale
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Old 10-10-2012, 06:29 PM   #2
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You have a 302? Just wondering cause this is the 96-04 section
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Old 10-10-2012, 06:31 PM   #3
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Yes a 94 GT 5.0 Can't find the place for 94-95 GT Where is it???
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Old 10-10-2012, 06:34 PM   #4
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I moved it for ya. It's the 79-95 section.
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Old 10-10-2012, 06:36 PM   #5
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I'm sure someone else will chime in with your answer. But check the useful mustang info thread in the stickies in this section. There is some good gt40 info in there.
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Old 10-10-2012, 06:36 PM   #6
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Thx
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Old 10-10-2012, 06:50 PM   #7
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Anyone ???? I can't find anything on a hole for the EGR in the Heads. I know there's a Hole in the Center of the GT40 Intake for the EGR & a hole needs to be drilled in the #5 Runner for the ACT Sensor. But I'm lost on the Heads. Anybody install GT40 Heads that had a hole for the EGR in the Heads???
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Old 10-10-2012, 06:57 PM   #8
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i did find this

There are some differences between the GT40 and GT40P cylinder heads. First off, GT40 heads are equipped with thermactor holes to connect to the EGR/smog equipment. GT40P heads are not. GT40P cylinder heads use an external EGR connective system (I believe in combination with the intake manifold). However, the latter can be drilled and tapped to accomodate the EGR ports, if that is your preference. Secondly, the GT40P has a somewhat revised combustion chamber, and different spark plug placement. Because of this, not all headers clear GT40P heads. Make sure to use a known GT40P-specific header. Regular headers can be used, but then require different spark plug wires to be used, usually ones capped with 90° boots. Furthermore, there is said to be slightly different chamber volumes. GT40 combustion chambers are slightly larger, with volumes ranging from 63-66 cc. The Explorer/Mountaineer heads (GT40P) are somewhat smaller, measured between 58-61cc chamber volume. Thus, GT40P's may give a small bump in compression. Finally, the last difference between the two are valves. Both have 1.84" intake valves, but the GT40 has a 1.54" exhaust valve whilst the GT40P cylinder heads have a slightly smaller one, at 1.46".

on here

http://www.fiveohinfo.com/performance/gt40-gt40p.html
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Old 10-11-2012, 05:47 AM   #9
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So are you saying the GT40 Heads can be Drilled for the EGR??? Sure hope my OEM parts are all set up with the hole for the EGR. Everyone kept telling me to make sure I got the intake with the EGR Hole or I'd have to drill it. Is there a way to tell what OEM Set up I have without removing the Intake?
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Old 10-12-2012, 12:01 AM   #10
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There is no need to drill the heads for the egr. The hole you are thinking of is for the smog pump on the back of the heads. Now would be a good time to delete the smog pump. You can use the internal egr but you would have to switch to a fox body egr spacer and throttle body set up, or just run the sn95 elbow and egr setup since its external any way.
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Old 10-12-2012, 12:03 AM   #11
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There is no reason to drill the #5 runner for the act either since the sn95 cars have it in between the MAF and the TB on the intake tube.
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Old 10-12-2012, 12:06 AM   #12
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Quote:
Originally Posted by dreamstang
I'm sure someone else will chime in with your answer. But check the useful mustang info thread in the stickies in this section. There is some good gt40 info in there.
I do need to do some updating to the information, going to have to find the missing parts.
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Old 10-12-2012, 06:18 PM   #13
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Remove Smog Tube

If I remove the Smog Tube Completely am I going to have lights lit up on my dash? Emissions wont even look at a car if any light is on.

---------- Post added at 04:18 PM ---------- Previous post was at 04:18 PM ----------

I'd like to remove all the pollution crap!!!
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Old 10-12-2012, 06:22 PM   #14
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Quote:
Originally Posted by Hellish Horse
If I remove the Smog Tube Completely am I going to have lights lit up on my dash? Emissions wont even look at a car if any light is on.
I put the gt40p heads on my 90 and the check engine light came on because I removed all my emissions. Might be able to have a shop burn your computer to remove the check engine light.
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Old 10-12-2012, 09:00 PM   #15
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Quote:
Originally Posted by Hellish Horse
If I remove the Smog Tube Completely am I going to have lights lit up on my dash? Emissions wont even look at a car if any light is on.

---------- Post added at 04:18 PM ---------- Previous post was at 04:18 PM ----------

I'd like to remove all the pollution crap!!!
There is a some info on the check engine light eliminator for taking out the egr in the mustang useful info in the stickies. Just taking off the smog pump shouldn't cause it to come on but it's possible.
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Old 10-12-2012, 10:57 PM   #16
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Here's the diagram to make the egr eliminator plug.
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Old 10-12-2012, 10:58 PM   #17
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I deleted the smog pump and no CEL but I also have a tune so...
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