solid motor mts breaking block?

I haven't seen any break a block. A buddy of mine has a 416 on E85 putting about 550 out at the flywheel (and very torquey) and his block had one ear broken from being dropped. When I built it for him I was worried it wouldn't hold at that power level with the broken ear but he's been running the snot out of it for nearly 3 yrs. now and it's still holding.