Whats the difference between GT40's and GT40P's?

95RED5.0 · October 8th, 2010, 05:57 PM

I have a 95 Mustang and a friend gave me a set of GT40's but I have heard GT40P's are better. I know the P's came on explorers but is there a difference?

Thlad · October 8th, 2010, 06:33 PM

Ya they are a different design. They moved the spark plug to more of the center of the cylinder so its more difficult to get the plug wires on if you dont have p specific headers or long tubes.

Bullitt95 · October 9th, 2010, 05:29 AM

The P's are definitely better. They come with smaller 58cc combustion chambers compared to the GT40's (62cc) so that raises the CR by 0.4:1, and they flow better especially on the exhaust size. The central spark plug location improves combustion efficiency but also makes the plugs more difficult to change.

95RED5.0 · October 10th, 2010, 12:54 AM

more difficult but not impossible right?

laser95 · October 10th, 2010, 02:47 PM

I am also considering the upgrade to the gt40p heads.I do not think the spark plug is not much of an issue if you have long tube headers.Mac makes a set of headers for "p" heads.

95RED5.0 · October 10th, 2010, 05:51 PM

i have a set of mac unequal length headers i got when i bought the car thats why i was asking

laser95 · October 10th, 2010, 07:36 PM

I was told if I ran the GT40's I could keep my bbk unequal length headers.But if I went to the GT40P's I would have to run longtubes.So you should be able to keep the headers you already have as long as you run the GT40's.

October 8th, 2010, 05:57 PM	#1
95RED5.0 Regular 1995 Mustang GT Join Date: Apr 2010 Location: Miami Posts: 54 iTrader: 0 reviews	Whats the difference between GT40's and GT40P's? I have a 95 Mustang and a friend gave me a set of GT40's but I have heard GT40P's are better. I know the P's came on explorers but is there a difference?

October 8th, 2010, 06:33 PM	#2
Thlad Regular 1995 Mustang GT Join Date: Mar 2008 Location: Kansas Posts: 100 iTrader: 0 reviews	Ya they are a different design. They moved the spark plug to more of the center of the cylinder so its more difficult to get the plug wires on if you dont have p specific headers or long tubes. __________________ BBK fender well cai, Mach 1 Rims, Accel ignition system, Steeda triax short throw, Venom 400 performance module, gt40 intake, 24lb injectors, 76mm mas

October 9th, 2010, 05:29 AM	#3
Bullitt95 Hardcore Enthusiast 1995 Mustang GT auto 13.546 @ 105.32 Join Date: Apr 2007 Location: Al Ain, UAE Posts: 1,452 iTrader: 0 reviews	The P's are definitely better. They come with smaller 58cc combustion chambers compared to the GT40's (62cc) so that raises the CR by 0.4:1, and they flow better especially on the exhaust size. The central spark plug location improves combustion efficiency but also makes the plugs more difficult to change. __________________ 243.5rwhp/284.2rwtq Mod list in My Garage

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October 10th, 2010, 12:54 AM	#4
95RED5.0 Regular 1995 Mustang GT Join Date: Apr 2010 Location: Miami Posts: 54 iTrader: 0 reviews	more difficult but not impossible right?

October 10th, 2010, 02:47 PM	#5
laser95 Newbie 1995 Mustang Join Date: Oct 2010 Location: Tampa Posts: 27 iTrader: 0 reviews	I am also considering the upgrade to the gt40p heads.I do not think the spark plug is not much of an issue if you have long tube headers.Mac makes a set of headers for "p" heads.

October 10th, 2010, 05:51 PM	#6
95RED5.0 Regular 1995 Mustang GT Join Date: Apr 2010 Location: Miami Posts: 54 iTrader: 0 reviews	i have a set of mac unequal length headers i got when i bought the car thats why i was asking

October 10th, 2010, 07:36 PM	#7
laser95 Newbie 1995 Mustang Join Date: Oct 2010 Location: Tampa Posts: 27 iTrader: 0 reviews	I was told if I ran the GT40's I could keep my bbk unequal length headers.But if I went to the GT40P's I would have to run longtubes.So you should be able to keep the headers you already have as long as you run the GT40's.

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