Hi guys i just got a 2003 mustang gt 4.6 how do check kow it the car has pi heads

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Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
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It should have PI heads originally. Do you suspect this motor has been replaced, or the heads have been changed?
 

wmburns

SN Certified Technician
Aug 14, 2009
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Your 2003 GT has PI heads unless someone has swapped in a non-PI motor.

It may have a Dorman PI intake.
  • The part numbers on the plastic
  • the bolts that hold the COP into the intake go DIRECTLY into the plastic and resemble wood screws. A real Ford unit will have brass inserts and real machine screws.
  • The Dorman unit will have two ECT bosses on the metal coolant cross over.
 

tsemmett

Active Member
Jul 2, 2019
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Intakes are different as well
7AE2F698-39BF-4132-955C-9C11BA950C8F.jpeg
Just FYI, these are both NPI intakes; they reversed the runner order when moving to PI (starts with Cyl # 5 instead of Cyl # 1). Some NPI cars got the aluminum crossovers (my 98 had one).
 
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