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Difference between 97-98 5.4l and 99-03 5.4l

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Old 07-04-2010, 11:45 PM   #11
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Originally Posted by C Denny Run* View Post
Did they change the 4.6 in 99 as well?
Not on the truck engines till 2001.

In a nut shell. The f-150 4.6 1997-2000 are Non Pi heads. All the other years through 2004 heritage are Pi heads. I beleive 2006 saw the 3 valve for the 4.6.

5.4 97-98 non pi. 1999+ Pi heads. 2004 3 valve for the new model while the heritage still had the 2 valve.

Intake manifolds are unique the the cylinder head. Non Pi head has a non pi intake. The intake manifolds for the 5.4 engines are wider than the 4.6 so they do not readily swap. Adapters exist to fit a 4.6 intake on a 5.4 but it is easier to use the proper manifold.

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Old 07-05-2010, 03:46 AM   #12
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JMC nailed it but I thought I'd throw out that 99-00 5.4's have the aluminum intake manifold and 01'+ have composite.
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