PI Heads
 

What year did they start putting PI Heads in trucks I picked up a 99 f150 singlecab 4x4 and do not know if it has the PI Heads?

99 was the first PI heads I believe.

pi heads have square shape intake ports, and non-pi heads have oval shape intake ports. that is the easiest way to tell the two apart.

Or you could just look at the casting numbers through the wheel well.

There's some pictures in this thread:
https://www.f150online.com/forums/sh...hlight=casting

define square intake ports? on the PI heads... cause i dont see the difference.. or what makes them square. its more of a flat oval..

4.6 didnt get pi heads till 2001 and 5.4 got them in 99

damn from that description my ported heads i bought are actually PI heads... grr just from the difference i just now noticed. hope this intake will match up :(

yeh i just checked the casting numbers 2001 mustang GT heads. they are brand new heads were never used. and ported so its all good just means i get to buy the better flowing intake!!