I've never seen a broken Mopar crank besides a few pics of aftermarket cast ones. But I've never seen a forged crank with cracks radiating from the forge line on the counterweight either, until now. I don't think they will fully fail and probably been there since 1970 and can be welded up and nobody would know. But right now with everything else I've seen in this motor and the car it came out of, nothing is going to be taken for granted.