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  Mustangsandmore Forum Archive
  Ford Racing
  E7TE vs GT40 vs GT40p heads?

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Author Topic:   E7TE vs GT40 vs GT40p heads?
mikes82GT
Journeyman

Posts: 61
From: Vancouver, Wa
Registered: Dec 2004

posted 10-13-2005 12:02 AM     Click Here to See the Profile for mikes82GT        Reply w/Quote
Which ones to get? I already have a set of E7TE's that I'm in the process of porting and polishing and came across an article online that told me the GT40's and GT40p's flowed much more stock than the E7's I'm working on and now my work is at a standstill cuz I'm not too sure what path to take. Continue with the E7's or look for some GT40's or the P heads? I know the P heads will need some special headers to clear the sparkplugs. Will I need special headers to fit the GT40's in my 82 mustang?

Stewart
Gearhead

Posts: 10525
From: Monterey, CA Mustangsandmore Member #437
Registered: Apr 2000

posted 10-13-2005 03:02 AM     Click Here to See the Profile for Stewart        Reply w/Quote
Ported E7's are nice, but the GT40 heads are better, in my opinion. I was contemplating them for my '90 GT a few years ago, before deciding on the Edelbrock Performer heads.

As you said, the P heads require a specific header, but the regular GT40's don't.

It's been a long while since I was in the 5.0 scene, but IIRC, the GT40 heads are also known as Explorer heads because they were on the Ford Explorers.

Stewart

------------------
cynot65, to a troll on the board: "what a demented little spit puddle you are"

Black '99 Lightning
- It's my 13.19 second work truck! :D

2000 7.3L PSD Excursion
- The family land yacht

1990 Platinum GT: 25th Year Anniversary Edition
- Stolen and stripped, waiting to be rebuilt and reborn.

M&M Member #437

capri man
Gearhead

Posts: 8777
From: doerun, ga.
Registered: Nov 2000

posted 10-13-2005 10:14 AM     Click Here to See the Profile for capri man        Reply w/Quote
this might help.
http://www.carbdford.com/tech/headflow.htm

------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg

Capri
Gearhead

Posts: 1747
From: Lyons, ILL, USA M&M member #007... the secret agent member
Registered: May 99

posted 10-13-2005 10:26 AM     Click Here to See the Profile for Capri        Reply w/Quote
The P heads are not as good as the GT-40 heads. Especially when the 40 heads are cleaned up in a few spots.

Yes you will need special headers. With the location of the spark plug you might need different wires due to the boot angle as well.

72Qsam
Gearhead

Posts: 139
From: Petaluma, Ca, USA
Registered: Nov 2003

posted 10-15-2005 01:37 AM     Click Here to See the Profile for 72Qsam        Reply w/Quote
We have some GT40y's on our 289 what headers for race only?
Sam

mikes82GT
Journeyman

Posts: 61
From: Vancouver, Wa
Registered: Dec 2004

posted 10-16-2005 10:03 PM     Click Here to See the Profile for mikes82GT        Reply w/Quote
quote:
Originally posted by 72Qsam:
We have some GT40y's on our 289 what headers for race only?
Sam

Tell me more about them (the flow, valve sizes, what they came on, etc.etc..).

72Qsam
Gearhead

Posts: 139
From: Petaluma, Ca, USA
Registered: Nov 2003

posted 10-18-2005 10:40 AM     Click Here to See the Profile for 72Qsam        Reply w/Quote
The 289 goes into a Pinto,there are super comp headers but went on a stock 289 intake. We installed 303Y heads,1.94/1.60, flow factory..170ish. I was curious if we have any other option for headers without blowing the wad ??????????

COBRAII7678
Gearhead

Posts: 121
From: Festus Mo U.S.A
Registered: Sep 2004

posted 10-19-2005 04:43 PM     Click Here to See the Profile for COBRAII7678        Reply w/Quote
quote:
Originally posted by 72Qsam:
The 289 goes into a Pinto,there are super comp headers but went on a stock 289 intake. We installed 303Y heads,1.94/1.60, flow factory..170ish. I was curious if we have any other option for headers without blowing the wad ??????????

Hedman makes a small tube header for the Pinto/MustangII

Big D
Gearhead

Posts: 6843
From: WELLS, NEVADA USA
Registered: Nov 2000

posted 10-20-2005 01:12 AM     Click Here to See the Profile for Big D        Reply w/Quote
I've got GT-40P heads on my 331 stroker.. They've been worked over a little and seem to work great.. Being as I've never ran anything else on my engine,, it's hard to say what performance difference there is..

The spark plug issue is real.. I was able to make a set of Heddman Long Tubes work with the heads.. It wasn't easy or pretty,, lets just say we massaged them a little..

Here's some information on my heads..

GT- 40P Casting #E7TZ GT40P
Ported and matched to intake and Heddman Hedders
1.72 Scorpion Roller Rockers
Comp Cam Triple Valve Springs
Valves were custom ground triple grind
Heads were shaved .008 (donít hold me to that figure,, but they were shaved true)

Following Information Taken From CarCraft Magazine on GT40P Heads..
GT40P Head Data:
Valve Size: 1.84 intake 1.46 exhaust
Chamber Volume: 60 cc
Intake Runner volume: 145 cc
Valve Spring (seat) 90 lbs @ 2.00
Valve Spring (@ .500 lift) 310 lbs @ 1.500
Valve Spring (coil-bind) 1.300
Retainer To Seat Contact 0.75 intake/ 0.77 exhaust
Ex/Intake Flow Ratio 66.8 @ 5.00 lift
Max Power (theoretical) 391 HP @ 5.00 lift
60 cc head raises compression about 0.6 point - when replacing a 65cc head on a 5.0 engine

The Performance Shop that Bored & Balanced my engine estimated that I was running at about 10.5 compression ratio..

The issue with the exhaust is really a pain.. To change the plugs you have to remove the headers.. You can do it without removing them,, but it's easier & faster to just get them out of the way..

It's also hard on Spark Plug Wires,, because they're to damned close to the exhaust..

I'm putting a new set of headers on my car.. The only set of long tubes I could find that were made for 66 Mustangs with GT-40P Heads are Tri-Y's from Central Coast Mustang.. I'll let you know how they work..

Hope that helps..

------------------
Don
6T6 Fastback
331 STROKER, T-5

Metallic Royal Blue & Silver
Candy Orange-Red Flames by McGrafix

My Pics

[This message has been edited by Big D (edited 10-20-2005).]

Big D
Gearhead

Posts: 6843
From: WELLS, NEVADA USA
Registered: Nov 2000

posted 10-20-2005 01:18 AM     Click Here to See the Profile for Big D        Reply w/Quote
quote:
Originally posted by capri man:
this might help.
http://www.carbdford.com/tech/headflow.htm


One more note.. The site above,, that Capri Man recommended - is a good source of information on sbf's..

They did have a bunch of literature on GT-40P's.. And,, it seems that they were quite high on them.. At least they were high on something..

------------------
Don
6T6 Fastback
331 STROKER, T-5

Metallic Royal Blue & Silver
Candy Orange-Red Flames by McGrafix

My Pics

bbjay351
Gearhead

Posts: 308
From: Festus, Mo Us
Registered: May 2004

posted 10-21-2005 12:45 PM     Click Here to See the Profile for bbjay351        Reply w/Quote
We took my buddies car to the dyno with both sets of heads, the GT 40's and the E7TE's. The gt 40's ported and polished made 270 hp at the rear wheels, the E7te's made 254hp fully ported and polished. What a difference in performance too. You could tell the difference. I believe the 94-95 gt's also had the gt40's stock.

capri man
Gearhead

Posts: 8777
From: doerun, ga.
Registered: Nov 2000

posted 10-21-2005 01:00 PM     Click Here to See the Profile for capri man        Reply w/Quote
here is the ultimate gt40p article.
http://www.geocities.com/motorcitymustang/gt40p.html

------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg

mikes82GT
Journeyman

Posts: 61
From: Vancouver, Wa
Registered: Dec 2004

posted 10-22-2005 02:39 AM     Click Here to See the Profile for mikes82GT        Reply w/Quote
quote:
Originally posted by capri man:
here is the ultimate gt40p article.
http://www.geocities.com/motorcitymustang/gt40p.html


That's the article I was referring to that got my curiosity up about these heads. It redirects you to stangpro.com

mikes82GT
Journeyman

Posts: 61
From: Vancouver, Wa
Registered: Dec 2004

posted 10-22-2005 02:41 AM     Click Here to See the Profile for mikes82GT        Reply w/Quote
It's a small world, huh?

capri man
Gearhead

Posts: 8777
From: doerun, ga.
Registered: Nov 2000

posted 10-22-2005 03:46 PM     Click Here to See the Profile for capri man        Reply w/Quote
yup that is the article that is responsible for me purchasing a set!!

------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg

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