gt40 p heads

03stanger · January 5th, 2007, 07:05 PM

got a set of heads for my buddy's car. they are the gt40 p heads off the exploders...i heard rumor that regular mustang headers will not work with these heads, that you had to buy some special ford motorsports headers....ive talked to some friends of mine and they have never heard of this...whats up

82GT · January 5th, 2007, 08:13 PM

It's true

mikebert · January 5th, 2007, 08:19 PM

It may or may not be true. The problem lies in the repositioned spark plugs. If your current headers and wire boots clear the headers, fine. If not, you'll keep melting the boot / wire.

1slo5.0 · January 5th, 2007, 08:19 PM

Some headers will work. The spark plug hole is moved down and rotated out which puts the electrode closer to the center of the combustion chamber. Standard unequal length shorty headers won't work because of the GT40P spark plug location. MAC offers a coated GT40P specific shorty and Ford Racing offers a set of stainless shorties that work. Stock Mustang headers work also. Most equal length shorties will not work. BBK equal length shorty headers have been known to fit. MAC, Hedman and BBK full length 1 5/8" headers fit. Some full length headers require minor clearancing on some primary tubes but is not a big issue. Spark plug wires with 90 degree boots are very helpful.

03stanger · January 5th, 2007, 10:18 PM

thanks for the help fellas

mikebert · January 6th, 2007, 01:14 AM

Yeah, I didn't want to mention that long tube work (since that's another expense) but all the long tube + GT40P set ups I've read about have worked.

Depending on the headers, some people only have one or two pipes that are a problem for clearance. If that's the case, you may consider buying a spark plug boot adapater (can't think of a more specific part name at the moment). You can get these 90 degree jobbies that clip on the spark plug, turn 90 degrees, then have a male end for the boot to clip on to.

They're kinda expensive to me, but a fraction of lube tubes, so if money is tight, that's an option.

January 5th, 2007, 07:05 PM	#1
03stanger Regular Join Date: Jun 2006 Posts: 123	gt40 p heads got a set of heads for my buddy's car. they are the gt40 p heads off the exploders...i heard rumor that regular mustang headers will not work with these heads, that you had to buy some special ford motorsports headers....ive talked to some friends of mine and they have never heard of this...whats up

January 5th, 2007, 08:13 PM	#2
82GT Regular Join Date: Nov 2006 Location: Danville, Pa. Posts: 244	It's true __________________ 1982 GT (t-top) 351w(.060),10:3, ported & polished iron heads, 1.94/1.60 valves, BBK shorties & flowmasters, 274XE cam, stealth intake, mallory dizzy, stealth intake, 750dp, Edge 3700 stall converter, C-4, 4:10's Best E.T 12.85@102mph

January 5th, 2007, 08:19 PM	#4
1slo5.0 Zippee is my step sister. 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 10,353	Some headers will work. The spark plug hole is moved down and rotated out which puts the electrode closer to the center of the combustion chamber. Standard unequal length shorty headers won't work because of the GT40P spark plug location. MAC offers a coated GT40P specific shorty and Ford Racing offers a set of stainless shorties that work. Stock Mustang headers work also. Most equal length shorties will not work. BBK equal length shorty headers have been known to fit. MAC, Hedman and BBK full length 1 5/8" headers fit. Some full length headers require minor clearancing on some primary tubes but is not a big issue. Spark plug wires with 90 degree boots are very helpful. __________________ Thanks to: Trick Flow, Team Z Motorsports, Total Engine Airflow and Furo Racecraft My daily driver has 16 cylinders and 4400hp @ 1000 rpm....

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January 5th, 2007, 08:19 PM	#3
mikebert Enthusiast Join Date: Oct 2006 Location: Augusta, GA Posts: 906	It may or may not be true. The problem lies in the repositioned spark plugs. If your current headers and wire boots clear the headers, fine. If not, you'll keep melting the boot / wire.

January 5th, 2007, 10:18 PM	#5
03stanger Regular Join Date: Jun 2006 Posts: 123	thanks for the help fellas

January 6th, 2007, 01:14 AM	#6
mikebert Enthusiast Join Date: Oct 2006 Location: Augusta, GA Posts: 906	Yeah, I didn't want to mention that long tube work (since that's another expense) but all the long tube + GT40P set ups I've read about have worked. Depending on the headers, some people only have one or two pipes that are a problem for clearance. If that's the case, you may consider buying a spark plug boot adapater (can't think of a more specific part name at the moment). You can get these 90 degree jobbies that clip on the spark plug, turn 90 degrees, then have a male end for the boot to clip on to. They're kinda expensive to me, but a fraction of lube tubes, so if money is tight, that's an option.

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