PI or NPI

damtheman69 · February 11th, 2009, 07:57 PM

I just bought a 1998 Ford Mustang GT. The thing is the car has some work done to it, some of it makes no sense to me. It has BBK shorty Headers and a 3 in exhaust, undrive pulleys, the usual cold air intake, a new plenum, 70mm tb, and all the usual bolt ons. The thing that kills me is that all this is on a stock motor with a lot of miles. I think, but i am not sure, that this has had a PI head swap. I am not sure. My question is, how do you tell if it is they are PI heads or NPI heads. Thanks.

HMUSN · February 11th, 2009, 08:00 PM

read the stamp that says "PI" on the heads.

seriously.

Drtbkercr5 · February 11th, 2009, 08:25 PM

Yep, there will be a bunch of numbers and then right below it, it will be stamped PI.

mustangracer2g · February 12th, 2009, 01:32 AM

+1 on that

also you can check the intake to see if its the right one, and also the oil filler neck will be on the passenger side instead of the driver side on the valve covers... usually... but yeah the PI stamp is the most SURE way to tell if the heads are PI

330CubeGt · February 12th, 2009, 04:40 PM

's

February 11th, 2009, 07:57 PM	#1
damtheman69 Look Ma! My First Post! 1998 Mutang GT Join Date: Feb 2009 Location: Texas Posts: 1 iTrader: 0 reviews	PI or NPI I just bought a 1998 Ford Mustang GT. The thing is the car has some work done to it, some of it makes no sense to me. It has BBK shorty Headers and a 3 in exhaust, undrive pulleys, the usual cold air intake, a new plenum, 70mm tb, and all the usual bolt ons. The thing that kills me is that all this is on a stock motor with a lot of miles. I think, but i am not sure, that this has had a PI head swap. I am not sure. My question is, how do you tell if it is they are PI heads or NPI heads. Thanks.

February 11th, 2009, 08:00 PM	#2
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	read the stamp that says "PI" on the heads. seriously. __________________

February 12th, 2009, 01:32 AM	#4
mustangracer2g Regular 1997 Mustang GT not as slow... PI swapped :-) Join Date: May 2008 Location: San Diego, Ca Posts: 275 iTrader: 0 reviews	+1 on that also you can check the intake to see if its the right one, and also the oil filler neck will be on the passenger side instead of the driver side on the valve covers... usually... but yeah the PI stamp is the most SURE way to tell if the heads are PI __________________ If there's one thing in life you should never take for granted its the ability to drive fast when given the hp to. (PI engine swapped now, so i can go just a lil bit faster haha) oh yeah, and why the hell do imports always try to race me?!

February 12th, 2009, 04:40 PM	#5
330CubeGt MM Fanatic 1997 SVT COBRA 1996 Mustang V6 Join Date: Dec 2007 Location: Orlando Posts: 4,880 iTrader: 14 reviews	's __________________ -04 IRS - Magnaflow - Wheel Replica - Autometer - FTBR - FRPP - SCT - Brembo - PRO 5.0 - BOI-

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