Don't be shocked if one rod journal is a different grind than the others. Back in the day many mechanics had a tool that would grind a crankshaft in the field with the crank still in the block. They would polish out the bad journal and install a +10, etc; rod bearing and put the pan back on. My son found his '53 had its 235 done that way sometime in a past life. Knocked when we fired it for the first time. Pulled the pan and wiggled the rod caps until #4 moved too much. Plastigauged it and put in a +10 bearing. It ran for 10+ years before being replaced by a 350.
