Diff in GT40 and GT40p heads

S

Stevejr

Member

Dec 17, 2008

63

0

6

Humboldt Tn

Jan 23, 2009

#1

• Jan 23, 2009

• #1

Whats the difference in gt40 and gt40p heads? Other than hp.

 

final5-0

Mustang Master

Apr 6, 2003

6,817

12

79

DFW Texas

Jan 24, 2009

#2

• Jan 24, 2009

• #2

not much

if you find a better deal on 40's, I'd get them and not be worried about them not being p's

Grady

 

KamiKaziDK

Member

May 16, 2005

555

0

17

Mesa, Az

Jan 24, 2009

#3

• Jan 24, 2009

• #3

you need special headers for the P's cause the spark plug angle....get regular gt40s unless you've done nothing to your exhaust and plan on getting headers in the future....then it's whatever you get a better deal on...usually Ps.

 

S

Stevejr

Member

Dec 17, 2008

63

0

6

Humboldt Tn

Jan 25, 2009

#4

• Jan 25, 2009

• #4

I already have gt40s I was just curious how to tell them apart, and if they made more power and why.

 

M

MORDENENOUGH

New Member

Jan 21, 2009

8

0

1

Jan 25, 2009

#5

• Jan 25, 2009

• #5

I also have a question about these heads if someone can help...I know that the P heads are not drilled on the back for smog but it seems that the standard gt40 are not all drilled either. Which ones are drilled and why? I want to run them on my buget build but can't seem to find any with the smog ports and I have to run them for emissions testing. Sorry if I jacked this thread, hope you guys can help.

 

blksn955.o

Founding Member

Mar 15, 2002

3,263

0

66

st.louis mo 314

Jan 25, 2009

#6

• Jan 25, 2009

• #6

My regular gt40 heads have the ports in the back. From what I read years ago the P's can not be ported as much due to the water jacket being closer/over the runner.

Stock for stock the p's should and seem to make more power...not much on avg. but more. If you find both sets for the same price get the P's. However, going with non p's will not be that big of an issue.

 

KamiKaziDK

Member

May 16, 2005

555

0

17

Mesa, Az

Jan 26, 2009

#7

• Jan 26, 2009

• #7

MORDENENOUGH.....they should both have smog on them, these heads are all from 93 and newer vehicles.

 

94GTCoupe

10 Year Member

May 7, 2006

1,412

92

79

CA

Jan 26, 2009

#8

• Jan 26, 2009

• #8

MORDENENOUGH is right about the smog ports on the gt40's,i cant say for sure about the gt40p's though.

the heads on the left are from a 97 explorer.the red arrows point to where the smog tube would attach.note the small hole next to the large hole with the threaded plug.its the same on the other side.

the head on the right is from a later model Mountaineer.this is the drivers side head with the rear of the head facing us.blue arrow-its just a threaded hole,it just stops,so it dont need a plug.also has no small threaded hole to attach the smog tube.its the same on the other side of the head.

(sorry,this is the best pic i could find.i know it's kinda hard to see,and yes they are all gt40 heads,not p's)

View attachment 275110

heres a pic of the explorer heads with the plugs removed.(yellow arrow)

View attachment 275112

on a side note.the upper and lower intake from the explorer was unpainted,cleaned up pretty easily.

but,the upper and lower from the mountaineer had somekind of REALLY tough paint on it,took me all day today and many coats of aircraft stripper to get it off.
i'm kinda loopy from all the fumes

 

M

MORDENENOUGH

New Member

Jan 21, 2009

8

0

1

Jan 26, 2009

#9

• Jan 26, 2009

• #9

davis3, thanks for the great pics, that's exactly what I was talking about. I have to run the heads with the ports because in my town all smog equipment must be operational to pass the emissions test. Do you know which vehicles came with the smog equipt heads? thanks

 

final5-0

Mustang Master

Apr 6, 2003

6,817

12

79

DFW Texas

Jan 26, 2009

#10

• Jan 26, 2009

• #10

You'll find emissions capability on ALL of em

Grady

 

S

Stevejr

Member

Dec 17, 2008

63

0

6

Humboldt Tn

Jan 26, 2009

#11

• Jan 26, 2009

• #11

I have a cobra with gt40s And was wondering if there was anyhting to the gt40ps from what im readin i think not when i tear down ill just port and polish the ones I have. Do ya agree?

 

GTA_V6_Mustang

Active Member

Nov 29, 2004

1,326

3

39

Miami, FL

Jan 27, 2009

#12

• Jan 27, 2009

• #12

Stevejr said:

I have a cobra with gt40s And was wondering if there was anyhting to the gt40ps from what im readin i think not when i tear down ill just port and polish the ones I have. Do ya agree?

Click to expand...

Just get the ones you have P&P.

The good thing about the P's is hands down they start flowing a greater amount of CFM at lower valve lift. And theres ways around the water jacket thing, trust me we got around it on my heads. I like the P heads but if you have the regular 40's already its not a big deal. And the way to tell the regular 40's from the P's is the P's will have a P, lol. And on the ends of the heads they will have 4 ribs instead of 3.