I've had several 318 forged steel cranks out of OEM production motors that had the #2 main bent(checking it with a set of V blocks and a dial indicator) .0007 that was just enough to make those cranks kave a tight spot when spinning it without any rods or pistons in the motor. I have heard the same thing on laying cranks down, they will bend Maybe a cast iron crank will I also have several smashed toes from bumping into a crank standing up and it falling forward onto my foot I have several new foregded steel stroker cranks in thier shipping boxes laying on my shelfs in the shop, I have never seen or heard of or had a forged steel crank be bent if it had not spun a rod bearing or suffered some other form of abuse first