Gt40p heads December 29, 2014, 10:33:58 PM I have a 95 gt, I am confused over this egr subject. So I pulled gt40p heads and lower and uppr intake from a 98 explorer. Do the egr ports match up from heads to intake or do I have to have something drilled out? Intake a heads from the same explorer. Quote Selected
Gt40p heads Reply #1 – December 29, 2014, 11:06:39 PM Gt-40p heads do not have smog ports on the back for your emissions. (Don't 94-95 gt's use a smog pump?)The upper and lower should line up fine for the egr, assuming you have the correct intake. Its generally accepted that the earlier intakes should always have the external egr capabilities as stock. The later ones sometimes have them, sometimes don't.If you have the hole below the intake, and the round circle in the center of the 8 intake ports, between the upper and lower, your all set. If not, you've got the wrong style.Weird for your first post on a cougarbird forum to be about a mustang... Quote Selected
Gt40p heads Reply #2 – December 30, 2014, 01:01:58 AM If the intake that I have came from the same explorer that I got the heads, shouldn't it line up? Quote Selected
Gt40p heads Reply #3 – December 30, 2014, 03:12:55 AM If it has the holes for the egr, then yes the holes for the egr should line up fine. If it doesn't have egr capabilities, there will be no hole to line up. Quote Selected
Gt40p heads Reply #4 – December 30, 2014, 05:10:24 AM '98 Should have the internal EGR...ought to be a hole in the center of the ports on the lower.The older GT40 style had external EGR...which is likely the setup you'd need, if your car has to pass the sniffer. Quote Selected
Gt40p heads Reply #5 – December 30, 2014, 11:50:43 AM the GT40P heads don't have thermactor (air injection) provision, which may be a problem if Colorado requires visual smog. You may be able to add the thermactor tubes as non-functional to pass visual. See this post from FEP (post #10): Totally-confused-about-GT40-and-GT40p-heads Quote Selected
Gt40p heads Reply #6 – December 30, 2014, 02:30:17 PM Older 96 and early 97 had GT40 heads, late 97 and later have P heads. P headed engines have EXTERNAL EGR, meaning the EGR source is fed to the valve by a tube attached to the exhaust manifold. The heads themselves have the provision for internal EGR, so if you had a stock intake, or an early Explorer intake, you could still use the stock internal EGR setup. On the earlier engines, the EGR is internal like your stock engine. So, you can use GT40's or GT40p's with an internal EGR intake (stock, 96-97 Explorer) but, if you use the intake from the P engine, you'll have to use a matching upper and lower AND feed the EGR valve from a tap on the header. The matter or internal or external EGR is determined by the intake, not the heads. Quote Selected
Gt40p heads Reply #7 – December 30, 2014, 04:58:21 PM So if I understand correctly as long as I use the upper and lower from the 98 also, I should be good Quote Selected
Gt40p heads Reply #8 – December 30, 2014, 06:21:24 PM As long as a 95 Mustang uses externally fed EGR, then yes. Quote Selected
Gt40p heads Reply #9 – December 30, 2014, 07:17:45 PM Quote from: TheFoeYouKnow;442165As long as a 95 Mustang uses externally fed EGR, then yes.Or can't I also have a machine shop drill out the egr port on the heads? Quote Selected
Gt40p heads Reply #10 – December 30, 2014, 08:22:37 PM Quote from: Mustanco;442170Or can't I also have a machine shop drill out the egr port on the heads?GT40P's don't have the Thermactor capability.. Quote Selected
Gt40p heads Reply #11 – December 30, 2014, 11:02:25 PM Quote from: ThunderbirdSport302;442175GT40's don't have the Thermactor capability..FYI EGR and Thermactor are two diffrent things. All Ford factory heads since the 80's (E6, E7, GT40, GT40P) have internal EGR passages. E6, E7, and GT40 heads have Thermactor passages. GT40P heads do not have Thermactor passages. Quote Selected
Gt40p heads Reply #12 – December 30, 2014, 11:24:26 PM Oh, I left off the P. Never really paid a lot of attention to E7 heads, other than taking several sets off of various engine in the past couple of years... Quote Selected
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