which heads work better on a mustang 90 with cobra intake? the gt40 or gt40p's ? why?

 

95-early 97 Explorers and Mountaineers had GT40 heads and internal egr/air pump passages. Late 97-00 Explorers and Mountaineers had GT40P heads - no internal egr, no air pump passages. In 01, the Explorer/Mountaineer switched to the 4.6L mod motor -- 00 is the last year the 5.0L was put in them.

The Explorer, Cobra and GT40 intakes all share the same lower, the uppers are different. All 3 flow similarly - the GT40 may have a slight advantage. The GT40 upper weighs noticeably less than the cast Cobra and Explorer uppers. The lower has no provision for the ACT sensor (in your stock #5 runner) so you'll either have to drill and tap, or lengthen the harness and relocate the ACT. I put mine in the elbow just before the throttle body.

If you need your stock emissions systems functional, get an intake from the early models (GT40 heads/early intake) - your fox body emissions parts will work fine.

 

My mustang 1990 does not have smog pump, so does that mean I dont' need to worry about the emission thing with the upper intake?

 

95-early 97 Explorers and Mountaineers had GT40 heads and internal egr/air pump passages. Late 97-00 Explorers and Mountaineers had GT40P heads - no internal egr, no air pump passages. In 01, the Explorer/Mountaineer switched to the 4.6L mod motor -- 00 is the last year the 5.0L was put in them.

The Explorer, Cobra and GT40 intakes all share the same lower, the uppers are different. All 3 flow similarly - the GT40 may have a slight advantage. The GT40 upper weighs noticeably less than the cast Cobra and Explorer uppers. The lower has no provision for the ACT sensor (in your stock #5 runner) so you'll either have to drill and tap, or lengthen the harness and relocate the ACT. I put mine in the elbow just before the throttle body.

If you need your stock emissions systems functional, get an intake from the early models (GT40 heads/early intake) - your fox body emissions parts will work fine.

I beg to differ on some of your info. Yes, the 93-95 Cobra, the GT40/Cobra intakes as sold through FRRP and the 96 to very early 97 Explorers and Mountainers use the same intake. All have the provision for the ACT in the #5 runner but only the 93 Cobra and GT40/Cobra as sold through FRRP have the hole drilled and tapped. The others mentioned above have the boss there, but it is undrilled.
The later 97-2000 Explorer and Mountaineers have a different upper and lower. I know this as I have one sitting here.
The lower intake does not have the boss for the ACT in the #5 runner and there is absolutely NO EGR hole in the lower or the upper. The Ford engineers even removed the metal in the upper plenum where the EGR used to be.
Finding a 96 or very early 97 Explorer/Mountaineer engine is not an easy task. You would be better looking on Ebay for the GT40 heads as they pop up all the time. Prices seem to be between $350-$400 for a set of stock ones. hth

 

So are the F67E-BA for the 96 till early 97 part (GT40)?

And are the F77E-BA the GT40p part number?

I can find plenty of both, but I am trying to get the GT40s for under $200 a pair.

Tks

 

Gregory

For an NA application, the GT40p heads would be the better application.

They have 58cc chambers, which yeild about 9.4:1 CR for your engine from the stock 9.0:1 and they flow better than the GT40 heads, especially at low lifts. You need p specific headers though.

However, for me, I am better off with the GT40s, due to chamber size and header resrtrictions.

 

gnvair said - "The later 97-2000 Explorer and Mountaineers have a different upper and lower. I know this as I have one sitting here.
The lower intake does not have the boss for the ACT in the #5 runner and there is absolutely NO EGR hole in the lower or the upper. "

I referred to the differences between the late 97-2000 and the earlier intakes in my post. I too know the diffrence well - as I've got a 99 model Explorer intake on my car - complete with no egr at all and the ACT relocated to the intake air elbow just upstream of the throttle body.

 

The 95-97 internal EGR intakes are not easy to find.