With an engine serial number I can match up the appropriate HPOP part number through the Sales Reference Manual.
I will say that there could be
a RARE exception to every rule, but the VIN number and serial number should tell the story. Sometimes, if the truck is purchased used, then the Previous Owner could have done practically anything to the engine.
One simple way to tell is that the 2005 cast iron pump sticks up through the middle of the HPOP cover. The IPR is screwed into this extended part of the HPOP. The HPOP cover will be aluminum.
Here is the 2004.5 "revisions" version of the 6.0L bible.
Check out the round aluminum pump on page 23 (picture 41). Also page 25 (picture 52)
On page 27 it states:
The high-pressure pump utilized with the new wavy high-pressure rails will have the capability to produce increased oil pressure over the original high-pressure pump.
No mention of the cast iron HPOP in the 2004 6.0L bible.
Then you go to the 2005 6.0L bible and it includes the last "running changes" to the 2004 engine. These were PRE-2005 engine production. The cast iron pump was NOT
one of those running changes.
Also in the 2005 6.0L bible, you can see the transition to the cast iron HPOP for 2005
, in the 2005 6.0L bible (page 2 and picture 5, as well as pages 3-4 and pictures 7-11):
THEN YOU HAVE THE EXCURSIONS ......
Note that the earliest 05 Excursions ACTUALLY came with the 04 HPOP since the Excursions were used as the place to "use up" the extra 04 engine inventory.
NOTE also from this 2005 6.0L bible: "The (2005) serial number break for Indianapolis built engines is 6344943. Production began June 29, 2004."
This mid-2004 beginning date for the 2005 engine production causes many un-informed people to think that they have 04 engines when they don't.
Internet vendors do MUCH to extend the mis-information, so do some forums.
The attachment summarizes the issue quite well ..... it is also from the 2005 6.0L bible.