Stupid question

[94GTHO]

How do you tell if your heads are PI or not

 

[94GTHO]

..........

 

[bakos24]

99-04 stangs have PI heads.
94-98 I believe have non PI heads.

 

[03ghoststang]

the intake ports on the heads are design differently on both NPI and PI

 

[Kilgore Trout]

There was a great thread the other day that had side by side pics of PI and NPI intake manifolds. I looked for it but I cannot find it...

 

[Outlaw97GT]

There was a great thread the other day that had side by side pics of PI and NPI intake manifolds. I looked for it but I cannot find it...

I still have the pics on my pc.....
View attachment 453965

PI intake, notice that the 1st runner is on the left side (driverside) , on right in pic..
View attachment 453967

NPI intake, notice the 1st runner on the right side ( pass. side) on left in pic.
View attachment 453969


But looking at the intake isnt always the way to tell if the heads are PI. Could be NPI heads with a PI intake.
Im not sure how to tell with them on the car, without taking off the intake to look at the ports.