Can you tell if the heads on a running car are non-PI or PI? I have a 1997 GT and I am wondering if the heads have been swapped. The prior owner mentioned something about a head gasket and I did not question him about it. Now, I am thinking he may have swapped the heads out from a junk yard car. Thats what he did with the transmission, he told me he rebuilt the trans, only to find out later he replaced it with a junk yard one. looking at the motor, it has a Dorman intake manifold. Is this a PI manifold? Unfortumatly I no longer have contact info for the prior owner to ask him.