I think the OP is being far too concerned with a crack leading to a crank failure in that cheek to Journal area of the thrust, especially if it’s not just a sharp edged 90 degree.
In all the pictures I have ever seen of failed cast large main factory cranks it aways seems to me that the crack that lead to the failure started inside the crank.
This looked like it was due to the sharp edges left at the internal point where the two cross drilled oil passages met.
Once I had a 455 crank that was useless to me due to a spun numbed 1 main bearing , so I tossed it up against a big rock and the it cracked right in half, and that seperation / crack ran right thru the meeting of the cross drilled oil holes.
Coincidence?
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And he was not talking about 1/8 or 1/4 mile ETs!
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Two dry rotted 14 x 10 Micky Thompson slicks.
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Two pairs of brown leather flip flops, never seen more then 2 mph.
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