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Topic: gt-40 (p?) heads... (Read 2969 times) previous topic - next topic

gt-40 (p?) heads...

Reply #15 –
Well, I got the heads today. They're Ps, and they look to be in great condition. I hope I never, ever have to pull heads on an Explorer/Mountaineer again. The headers were a total PITA to work around when it came time to get the lower head bolts out.
Tbird232ci, do you happen to know the part number for the 90 degree boot plug wires?
:cougarsmily:5.0 HO, E303 cam, Exploder/Cobra intake, smog pump delete, Ford Taurus electric fan, MAF conversion, BBK headers, MAC 2.5" off-road exhaust w/x-pipe, AOD w/shift kit, 8.8 Trac-Loc rear w/disc brakes, 5-lug conversion w/'98 Mustang GT 17" wheels, Mach 1 springs:cougarsmily:

gt-40 (p?) heads...

Reply #16 –
Just so you know GT40P and GT40 iron heads use the same spark plugs. Makes finding plugs easier (just say you need plugs for a 93 Cobra ;) ).

Many companies make 90* plug wires for 5.0s. Check summit. I think MSD makes 9mm wires with a 90* boot.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

gt-40 (p?) heads...

Reply #17 –
Why not say you need plugs for an Explorer?  Seems easy enough.
One 88

gt-40 (p?) heads...

Reply #19 –
Quote from: xjeffs;208704
I was reading last night that they switched to the P heads for lower emissions.  They reconfigured the combustion chamber and moved the plugs, reconfigured the exhaust port to flow just as much with a smaller valve.


That information is "old hat" to me...but thanks anyway.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

gt-40 (p?) heads...

Reply #20 –

I just had to get a look at the things to come. i'm not so sure about the red, but then again, whatever.
:cougarsmily:5.0 HO, E303 cam, Exploder/Cobra intake, smog pump delete, Ford Taurus electric fan, MAF conversion, BBK headers, MAC 2.5" off-road exhaust w/x-pipe, AOD w/shift kit, 8.8 Trac-Loc rear w/disc brakes, 5-lug conversion w/'98 Mustang GT 17" wheels, Mach 1 springs:cougarsmily:

gt-40 (p?) heads...

Reply #21 –
Quote from: Sick88Tbird;208856
That information is "old hat" to me...but thanks anyway.


Sorry, I misread your post.  I thought you wrote you didn't know "why" not "when" they switched.  I thought it was an odd statement.  My bad.

gt-40 (p?) heads...

Reply #22 –
the front side of the head is stamped with a P if they were a P

ive often wondered how much better my 289 heads are to the gt's.  with 1.45/1.94 valves, ported and shaved .030, studed with 1.6 rollers, they gotta be a decent set.

gt-40 (p?) heads...

Reply #23 –
Quote from: xjeffs;208885
Sorry, I misread your post.  I thought you wrote you didn't know "why" not "when" they switched.  I thought it was an odd statement.  My bad.


Yeah, it'll happen.  I'm still not sold on them being better than the original iron gt-40's and I probably never will...but that's just me.  I understand about velocity and all that...I just wonder what the test standards were for that flow bench test...you can test the same heads different ways and end up with different results one way or the other.

It's ashame...Ford had all the hardware to pump out 280-300hp 5.0's, but instead went to the lack-luster mod-motor in '96.  Can't win'em all, I suppose.  The one thing I did find interesting is how little room there is for port work before hitting a water jacket...I wonder if the original iron GT-40's had the same water jacket above the exhaust port?

-Don
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

gt-40 (p?) heads...

Reply #24 –
"P" headers are available from MAC, or used to be. They are less of a pain to install and clear better than the FMS versions. BTW they are 50 dollars cheaper. Of course they are not stainless or coated. "P" heads are the best flowing factory windsor small block head available. Kinda like the Vortec for the Chevrolet. These heads will calm detonation issues to a point due to the cumbustion chamber design and plug location. 340 hp is easy w/ "P" heads an "E" cam, roller rockers, and the explorer intake manifold. a 5 speed will put that combo at a 12.50 quarter with a 3.73 gear and 25 mpg. Best street combo for the buck, Good score. That is definately the cheapest way to go to have a badass 5.0 for low bucks. Strip that Explorer to the ground. BTW if you want a cool ranger, the explorer 8.8 rearend will bolt right in and has rear disk brakes. get the wiring harness and all and swap it in a Ranger with a T-5. 12.0's is easy.

gt-40 (p?) heads...

Reply #25 –
Quote from: CougarSE;208750
Why not say you need plugs for an Explorer?  Seems easy enough.


Because the Advance auto by me didn't have Autolite plugs for a 5.0 Explorer but the did for a 93 Mustang Cobra :hick:
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

gt-40 (p?) heads...

Reply #26 –
ok so the p heads have straight heads and the regualr gt40s have angled plugs? anything other I could use to tell if the motor im looking at has gt40's on it or not? I already looked at it and said id buy, and all i remeber is the plugs were on an angle, and the guy said when he bought the motor the heads had already been put on the motor, they dont match, the block was painted blue adn the heads are rusted.  Port shape or anything to distinguse between E7's and gt40's?
RIP 1988 and 1990 Lincoln Mark VII LSC
I welcomed the dark side and currently am driving a 2000 Dodge Durango SLT plus, with a 5.9, Code named project "Night Runner"
Shes black on black, fully loaded, with headers, 180 tstat, e fan, straight exhaust into a cherry bomb vortex ler, full tune up, ported intake and T/B, MSD coil, and round aircleaner.
Mods to come: Fully rebuilt and heavily modded 46RE, and a richmond rachet locker.
my $300 beater ;)
R.I.P Kayleigh Raposa 12/18/90 - 2/24/07

gt-40 (p?) heads...

Reply #27 –
I think the GT40's have 3 little raised bars on the front of the head stamped onto it.E-7's don't.The E-7 and GT40 heads both have angled plugs.I'll almost bet that the GT40 heads were taken off and replaced with something else.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

gt-40 (p?) heads...

Reply #28 –
motor is an 89 van motor, so it had the truck intake, and would have been e7 heads no?
RIP 1988 and 1990 Lincoln Mark VII LSC
I welcomed the dark side and currently am driving a 2000 Dodge Durango SLT plus, with a 5.9, Code named project "Night Runner"
Shes black on black, fully loaded, with headers, 180 tstat, e fan, straight exhaust into a cherry bomb vortex ler, full tune up, ported intake and T/B, MSD coil, and round aircleaner.
Mods to come: Fully rebuilt and heavily modded 46RE, and a richmond rachet locker.
my $300 beater ;)
R.I.P Kayleigh Raposa 12/18/90 - 2/24/07

gt-40 (p?) heads...

Reply #29 –
Quote from: daboss351;220791
motor is an 89 van motor, so it had the truck intake, and would have been e7 heads no?


like Vinnie said, there should be 3 vertical bars on the front of the head facing the radiator. gt40p's have 4 lines.
1979 Ford Fairmont
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5.0L/4R70W/8.8"/5-lug/3" Exhuast