Randy Winberg who makes some of the best crankshafts in the world, told me it did not matter how a crankshaft was stored.
That is good enough for me.
I don't need anyone to tell me that storing a crankshaft on its side is fine, I can figure that out by just looking at it. The mains are 3 inches thick and just a few inches long. A steel bar that size cannot be bent by a few pounds of load. The topic is silly but it pops up on a regular basis.
