Can you store an engine on its end?

...Given of course, you drain the oil and don't lay it directly on its flywheel(support the block around the flywheel perifery or just take it off)...

I don't see why it wouldn't work, but why? Of course there are many more knowledgeable than me here so I will let them chime in.

I figure if the back of the block will take a 7K rpm clutch dump then it will withstand sitting on the floor. I have a couple of SBC sitting on the back of the block.

Yes.

I do it all the time. No harm done.

If anything, it makes it easier to assemble the front stack on a rotary.

I thought of something at work today.

If the engine has a straight shaft like a rotary, or has the thrust bearing on the flywheel-most main journal, you can store it on the flywheel.

If the thrust bearing is in the middle, then do NOT store it on the flywheel.

I forgot that them pesky piston engines have crankshafts with all sorts of weird notches and cutouts in them Then I remembered, hey, we have a crank rack because you're not really even supposed to store cranks on their sides because, technically, they can go out of plane over time.