How Robust is the 318 block?

I think the concern might be the combination of +.060 and the extra stroke that can load the cylinder walls more. As most have said, check for thickness as well as core shift.

Bottom end would tend to be a little weaker than a 340/360 because of less material in the main caps.
can 340 main caps be used on a 318 after a line hone? any aftermarket caps for 318??