mechanics say I got the wrong engine?!?!

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Dec 11, 2003 | 06:49 AM

#16

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

It will say on the valvcover sticker if it is a Windsor built engine or if it was built in the Romeo plant. There are some differences in the internals of the two.
Jimmy

Dec 15, 2003 | 07:22 PM

#17

HomerWinzlow

Logistics Pro

Joined: Jul 2003

Posts: 3,595

Likes: 52

From: Lawton, Oklahoma

13670 POWER IMPROVED VS NON-POWER IMPROVED CYLINDER HEADS - TIP
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.

This is just an FYI for those wondering about the power difference in later engines.

Did you ever get this resolved on the problem posted?

Last edited by HomerWinzlow; Dec 15, 2003 at 07:25 PM.