You need to take better pictures for sure. My question to you is this....what have you found? Can you explain anything? Do you know what to look for? Whats the condition of the rest of the crank look like? Did you measure anything at all? Check for any other signs of weakness at all? Do you see any issues with the girdle that may have led to this happening? Did you do a bolt stretch test to see if the ARP studs have been hour glassed at all? Theres so much questioning to be had and a lot of answers to be be accounted for. By you doing what I think you're doing (tearing it down to say you did it) doesn't help those that are sitting here wondering on a mechanical/engineering side what and how this was caused. This engine should have been taken apart by an engine builder.
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