[mkmskm]

I've got a photo that looks just like that from a fellow club member here. The engine had 500 miles on the rebuild and what he suspects is that the crank was built back up and the heat was wrong doing it. On his break you can see about 1/2 the metal in the diameter just plain failed. Any ideas on the history of your crank? Yours obviously had weights hung on it. What else was done to it? Makes me wonder if it had the same issue.