I pulled the cam and there is damage to the two lobes where the lifters were damaged. The rest of the cam looks good. The cam is by Elgin and is likely a custom grind. I will take it to Clay Smith Engineering tomorrow and maybe they can fix it. At this point I am thinking the pair of lifters got out of their dog bone retainer, rotated for a bit, and went back into the retainer. I plan to turn down my rev limiter (currently 6500) and cross my fingers that the problem does not recur. Here are photos of the cam stampings and damage to the two lobes.
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