gt40p heads?

montyd

Member

Mar 13, 2006

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Oct 22, 2006

#1

• Oct 22, 2006

• #1

i am looking at getting a set of heads off an explorer like everyone does. and i saw a forum on here where someone said there is a comparison of explorer and gt40 heads and the pros and cons of it on stangnet but i cant find it. does anyone know or have the link? any help would be appreciated thanks fellas

 

Brett88lx

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Sep 3, 2006

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Oct 22, 2006

#2

• Oct 22, 2006

• #2

This may or may not help but I always assumed that the cylinder heads off an Explorer WERE GT40P's.

 

montyd

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Mar 13, 2006

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Oct 22, 2006

#3

• Oct 22, 2006

• #3

i know they are gt40p heads i want to know the difference betweent eh gt40p and the non p heads

 

9

95GTAODE

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Nov 25, 2004

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Oct 22, 2006

#4

• Oct 22, 2006

• #4

'96 to early '97 came with standard GT40's, while
mid '97-'01 came with P's.

-40's can be identified by 3 lines cast into the ends of the heads,and "GT" cast into the rocker valley and beside the lower rear head bolt hole.

P's have 4 lines and "GTP" cast into the same places.

P heads also have 58cc nominal chambers compared to 62-64cc for the standard-40's, as well as a smaller exhaust valve that promote's velocity, along with the spark plug relocated closer to the center of the chamber.

All told, P's are probably worth 10-15 hp over the regular 40's.

The relocated plug angle is why P's need specific headers.

 

montyd

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Mar 13, 2006

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Oct 22, 2006

#5

• Oct 22, 2006

• #5

so my shortys that are on my car now wont work with the new head from an explorer?

 

9

95GTAODE

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Nov 25, 2004

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Oct 22, 2006

#6

• Oct 22, 2006

• #6

montyd said:

so my shortys that are on my car now wont work with the new head from an explorer?

Click to expand...

Depends what year explorer... '96 and early 97's have standard GT40's, so you would be fine.

If they are off of a mid-97 -01, they are P's and require a P specific header... FRPP and MAC make P shorty's, and, while nor designed for P's, BBK and MAC long tubes do work.

 

V

v8only

Active Member

Jul 3, 2003

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Oct 22, 2006

#7

• Oct 22, 2006

• #7

in my opinion, the differences functionally are negligeable and debateable. The only difference imo worth considering is that the spark plug angles of the p heads require ford racing shorty p headers, or mac p headers (garbage), or some wicked 90 boots and customizing on headers. Not a big deal though, those ford headers are just over $200 on summit in stainless form, and give you tons of access to the plugs.

 

90

Active Member

Sep 24, 2006

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Michigan insane asylum

Oct 23, 2006

#8

• Oct 23, 2006

• #8

i no about the 4 slash on the gt40p's and 3 on the gt40's... i thought the gt40 were iron.. and the gt40p's were aluminum?/? im not 100% sure but is that true ?

 

V

v8only

Active Member

Jul 3, 2003

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Oct 23, 2006

#9

• Oct 23, 2006

• #9

they're both iron heads, i'm running an entire 97 explorer motor now with the p heads.

 

BlownFiveLiter

have car, will race....wait, it doesn't run

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Nov 29, 1999

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Chicagoland

Oct 23, 2006

#10

• Oct 23, 2006

• #10

Everything you want to know about GT40P heads

 

D

dcrab

New Member

Nov 13, 2006

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Nov 27, 2006

#11

• Nov 27, 2006

• #11

Tri-state offers some p's with 1.94/1.54 valves. I understand that factory was 1.84/1.46. Are the larger valves a good improvent over stock for this peticular head?

 

L

Lxstang306

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Nov 27, 2006

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Nov 27, 2006

#12

• Nov 27, 2006

• #12

gt40p have diff exhuast ports thats why not all headers will fit them spark plugs have been moved to.

 

millhouse

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May 14, 2002

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Simpsonville, SC

Nov 27, 2006

#13

• Nov 27, 2006

• #13

Lxstang306 said:

gt40p have diff exhuast ports thats why not all headers will fit them spark plugs have been moved to.

Click to expand...

The exhaust ports have nothing to do with fitment issues...it's all in the plug angle.

 

jtfairlane

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Mar 5, 2006

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Nov 27, 2006

#14

• Nov 27, 2006

• #14

Lxstang306 said:

gt40p have diff exhuast ports thats why not all headers will fit them spark plugs have been moved to.

Click to expand...

The exhaust ports on GT-40P heads cause no issues with just about any small block ford headers. The exhaust ports are a "redesigned" port in comparison to an E7TE head or a standard GT-40, but they are not a raised port or anything else that would require different headers. The only reason they require unique headers is because of the revised plug angle.