OHNO60 Posted January 18, 2008 Share Posted January 18, 2008 DO ANY OF YOU GUYS REMEMBER HOW TO DETERMINE WHATS A PI AND NOT A PI HEAD ON A 5.4? THANKS IN ADVANCE GUYS! Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted January 18, 2008 Share Posted January 18, 2008 Tony I think this should help you out... Quote: HEADS There have been two different head castings used for the SOHC motors, each with two variations, and one DOHC casting that was used on both the right and left side of these engines. All of the SOHC heads are Windsor castings, so they have individual caps on each cam journal and four 10 x 1.5mm holes in both ends of the heads, but the DOHC heads are Romeo castings, so they have ladder caps and four 8.0 x 1.25mm holes on both ends. 1997 (through 7/20/97) SOHC "Not Power Improved" Heads The 5.4L engines originally came with a F65E, F75 or F75E castings. They’re all "NPI" heads that have the bigger chambers with the "swirl fin" behind the intake valve and the small, oval shaped, intake ports. This early head is unique because the two blind holes that are used for the pegs that keep the intake gasket aligned during installation are drilled toward the inside of the port, closer to the valley. ’97 (7/21/97) through ’99 SOHC "Not Power Improved" Heads Ford made one minor, but important, change to the "NPI" head late in 1997; the intake gaskets were modified and the blind holes for the alignment pegs were moved over to the opposite side of the ports so they were closer to the head. It appears that Ford made this change only on the F75E castings, but it’s best to check all of the 5.4L "NPI" castings to be sure you get the right heads on the right engine, or make sure that you send the gaskets that match the heads that were installed on the long block. 1999-’01 SOHC "Power Improved" Heads The "power improved heads" with the square intake ports were introduced in ’99. They had bigger intake valves, different springs and a heart-shaped chamber with a modified swirl-fin behind the intake valves. They’re all XL3E castings. NOTE: The "PI" heads weren’t used on everything in ’99, so be sure to have your customer actually look at the intake ports before selling an engine or you will have about a 50/50 chance of selling the wrong engine. 2002 "Power Improved" Heads Ford continued to use the "PI" heads in 2002, but they revised the intake gasket again, so they moved the two dowel holes back over to the valley side of the ports. There are two versions of the later gasket, one that has a coolant restrictor built into the gasket and one that doesn’t, so rebuilders need to be especially careful when supplying gaskets for these late model applications. This latest version of the "PI" head is a 2L1E casting. Quote Link to comment Share on other sites More sharing options...
OHNO60 Posted January 19, 2008 Author Share Posted January 19, 2008 THANKS LARRY! THAT 'LL DO IT. /forums/images/%%GRAEMLIN_URL%%/thumbup.gif Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted January 20, 2008 Share Posted January 20, 2008 Thanks I have had that for a while, just waiting for the question to come up, I'm sure it will again... Quote Link to comment Share on other sites More sharing options...
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