InjunTom is absolutely correct. Caca passa... Before pointing the finger (which ever one you choose to point), be sure where you stand.
If the rod nuts are still tight on the bolt, and the bearing is chewed, clearance or oil starvation are the likely culprits. If there's no serious damage to other cylinders, measure the clearance there. Chances are, it's "typical".
If the clearance appears to be correct, the oil pump or oil gallery plugs would be the next place to look. If the front gallery plugs are gone, this CAN happen, toot-sweet. Technically speaking, the missing plugs would be the resonsibility of the short block assembler, but it's also the job of the "final" assembler to check all that stuff. NEVER ASSUME... That is, check, double check, and then, when you're satisfied all is well, CHECK IT AGAIN!!
Let us know what you find.
Jim
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