PI Heads on 4.6L ?
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New User
Joined: Aug 2004
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PI Heads on 4.6L ?
I have a 2000 Expedition 4x4 XLT 4.6L with a Windsor engine (vin code "6"). How do I determine if I have "PI" heads?? Is there any way to tell without tearing into the engine?
I have taken one of the valve covers off in the past and have the 2 camshaft cap "clusters" that hold the cam in place (not individual caps). Also, the camshaft is bolted to the timing chain gear (not pressed).
Any help would be greatly appreciated.
I have taken one of the valve covers off in the past and have the 2 camshaft cap "clusters" that hold the cam in place (not individual caps). Also, the camshaft is bolted to the timing chain gear (not pressed).
Any help would be greatly appreciated.
Hotshot
Joined: Aug 2002
Posts: 12,679
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From: BC, Canada
There is a Ford Special Service Message that says.........
WHEN SERVICING CYLINDER HEADS ON A 4.6L, 5.4L & 6.8L ENGINES, PLEASE BE AWARE THAT THERE ARE SEVERAL DIFFERENT COMPONENT COMBINATIONS. THERE ARE POWER IMPROVED (PI) AND NON-POWER IMPROVED (NPI) HEADS FOR THESE APPLICATIONS. THESE HEADS ARE NOT INTERCHANGEABLE AND LOOK DIFFERENT (INTAKE PORTS ARE SQUARE ON THE PI & OVAL ON NPI). PLEASE USE ENGINE TAG CODE, RF NUMBERS STAMPED ON HEADS (ABOVE EXHAUST MANIFOLD) AND VISUAL APPEARANCE TO DETERMINE IF PARTS ARE COMPATIBLE. FAILURE TO FOLLOW THESE CHECKS MAY RESULT IN ENGINE FAILURE. 1997-1998: ARE ALL NPI 1999 LIGHT DUTY TRUCKS, INCLUDING F-150, F-250, EXPEDITION/NAVIGATOR 2V: ARE ALL PI 1999 SUPER DUTY F-SERIES AND ECONOLINES: ARE NPI AND 2000 ARE ALL PI.
WHEN SERVICING CYLINDER HEADS ON A 4.6L, 5.4L & 6.8L ENGINES, PLEASE BE AWARE THAT THERE ARE SEVERAL DIFFERENT COMPONENT COMBINATIONS. THERE ARE POWER IMPROVED (PI) AND NON-POWER IMPROVED (NPI) HEADS FOR THESE APPLICATIONS. THESE HEADS ARE NOT INTERCHANGEABLE AND LOOK DIFFERENT (INTAKE PORTS ARE SQUARE ON THE PI & OVAL ON NPI). PLEASE USE ENGINE TAG CODE, RF NUMBERS STAMPED ON HEADS (ABOVE EXHAUST MANIFOLD) AND VISUAL APPEARANCE TO DETERMINE IF PARTS ARE COMPATIBLE. FAILURE TO FOLLOW THESE CHECKS MAY RESULT IN ENGINE FAILURE. 1997-1998: ARE ALL NPI 1999 LIGHT DUTY TRUCKS, INCLUDING F-150, F-250, EXPEDITION/NAVIGATOR 2V: ARE ALL PI 1999 SUPER DUTY F-SERIES AND ECONOLINES: ARE NPI AND 2000 ARE ALL PI.
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New User
Joined: Aug 2004
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PI Heads
Thanks. Thus, if my Expedition is a 2000 it definitely has the PI heads. I dropped it off at the shop today to get a new (reman) engine installed. I'm also having the pistons, etc., balanced and the heads ported. I just wanted to make sure I had the PI heads, as the price I was quoted for porting is for the PI heads.
