It is difficult to determine if the crankshaft and the bearings are aligned properly. Perhaps during assembly in the factory, the bearings were fitted with a minute misalignment which will only be amplified and further exaggerated at high revs. I guess it's a draw of luck. A guy at the track broke 3 crankshafts on the same engine at the same place.

I also know a few people who when they break a crankshaft in their engine, they try to get a spare crankshaft in and sell it as a 2nd hand engine to another unsuspecting person or just sell the other parts of the engine.

Anyway, it would be great if Dino, Top Gun 777 Grinder or Motorman could shed some light on how to detect and know if the crankshaft is installed correctly and aligned in the bearings...