Something strange has got to be going on, you're not going to eat up a set of bearings so bad in 12 minutes that it's going to make that much knocking noise... even if it spins a bearing in the journal, it's not going to knock like crazy. I wonder if something didn't get torqued down right or something didn't seat right. If I were you, before I did anything I would pull it all apart and see what's going on with the rod bearings period and maybe something simple.
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