An error in my post has been pointed out to me.

Please look at my post again in case I may have miscommunicated, I meant to
refer to the cases/blocks/mains as being magnesium, aluminum, and steel; I
am fully aware that a crankshaft is made of steel. I guess I should have
more fully emphasized the cases just prior to listing the materials. I'd
hate to see what a magnesium crank would look like after a single run to
redline(if it made it that far).

Doug Jones