well from what you've told us there is two ways that the engine could have lost oil pressure, first you 're oil pump could have let go then the bearings were wrecked due to lack of oil ,
or either bearings wore out, causing excess clearance and would also lose oil pressure .
were all the clearences correct and was the engine cleaned out correctly ofter machining these could both cause ur engine to wear out bearing to soon.
I just wanna go fast with V8 GRUNT!
XD 351 ,toploader 9" lsd 300rwhp
motorvation top10 , AME top 10 + top engine bay + top interior + top sedan +top street machine ,
all ford day top 10 . 2005 was a good year for the old girl