[Walt Fricke]

Naw, it was the bearing. Looking up bearing failure or the like on Google produced a site which showed a picture of fatigue failure or stress failure or the like. Looked just like this.

Some part of the substrate isn't up to the loads imposed. In my case that included 8,200 rpm on the dyno, but the engine with earlier production runs of Glycos (by maybe 8 years?) which was run to that had no issues (bearings good enough to make me regret the teardown). So it appears Glyco reformulated things for rod bearings which included a weaker layer in there somewhere.

Don't know if this would happen on a car not run beyond the stock rev limit (~6,500-7,000) of these early cars, or only occasionally run up that high (as in not raced).