I didn't break it but feel it would've broken eventually. 360 block with a 4" crank, I ran it for five years, best was 6.57 @ 104 in a 3260# Dart. When I took it apart to freshen it up the cam and main bearings were worn odd from the back to the front. Luckily a member here called me with a R1 engine that he no longer needed.

Several years ago there were photos posted of a small block that busted a couple cylinders from top to bottom that wasn't caused by rotating assembly failure. I don't remember what site it was posted on.