I never had a crank fail either, or anyone I know of.
After I get one ground I have it magnafluxed and ultra sound for cracks just to be safe. But never had one fail.
This folklore is getting good.
There are at least 16 gearheads that have posted to this posting.
How many really built a 400 motor and have it in their ride, and not heard it from someone else?
The ones I know, no need to reply.