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There were some fundamental differences between the early Studebaker President eights and the Pierce eight introduced in 1929. The President has five main bearings while the Pierce eight has nine. The crank on the ’29 Pierce is fully drilled for pressure lubrication to the mains and rods.

I did not know that a drilled crank was not used on the Presidents until 1931. That would imply to me that the earlier engines are splash lubricated? I’m guessing that the ’31 Presidents were the beginning of the nine main bearing engines in the Studebaker line.