Quote:
Originally Posted by gearmesh, inc.
I just got done on a 4.7 Dodge that overheated and caused an exhaust valve seat to drop out of the head. Since the valve couldn't rise up far enough in the head with the dislodged valve seat, it let the roller cam follower jump out of place when the cam came around on the base circle. Keep an eye out for dislodged valve seats when you tear that 5.4 down. Dislodged seats can cause valve bending, too.
Sounds like you may have an oil pressure problem, too. From what I can remember from my Ford technician days (whew, long time ago!) when mod motors first came out, mod motor oil pump gears might be powdered metal like the factory con rods. We all know how strong those are, now don't we?
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This situation could be spot on^^
The oil pump goes through the crank, the impellar is forged aluminum, there are no moving parts eccept the impellar and it is cut to fit slots (big slots) on the crank. I don't think i have ever seen one fail, however they can loose seal at the block flange and at the pickup tube.