Topic: How to tell if I have pi heads

[kkauer]

I just bought my 98 GT about a month ago, and from what I've been reading it seems to have more power then it should. Other then the exhaust the guy that I bought it from didn't say anything about mods but it had been owned by at least two people before him. So I looked at the engine and someone has defiantly done some work done around the heads. Now with it only having 79k miles on it I don't think it was in need of a tune up, so does anyone know of anyway to check if it has pi heads other then taking apart my engine?

[Soaring]

Visually from the outside the PI and NPI heads are the same.  Try finding either a stamping number or the actual PI stamped on the head somewhere. If nothing else, take off one of the manifolds and you can identify it.  The PI heads will have a square port, and the NPI ports will be tear drop shaped. 
The oil fill is a dead give-away if it is on the pax side,  but some PI have it on the Driver's side too.
 Also, maybe check the coolant sensors to see if there is a differently tapped one or a "Y" on the sensor cause pre-PI had two sensors where PI has one, so the wiring dictates that you mod for two sensors.

[kkauer]

Thanks alot

[ronster]

99-04 were PI. 96-98 were non-pi. Engines were either Romeo or Windsor.

[Soaring]

99-04 were PI. 96-98 were non-pi. Engines were either Romeo or Windsor.

That's true, but since he has a 98 where the engine from a 99 or newer Mustang engine could have been added, he has no way to identify it as a PI or an NPI unless he follows the above.   Most likely he has an NPI because anymore these cars are throwaways .
Instead of repairing them with a fresh engine, kids today usually opt to buy a new car instead of refreshing their old one.    I may go to a junk yard and buy a 90 something Mustang and restore it just for grins. 

[ronster]

True. Any big Mustang clubs down in Texas?