[Bearman90]

I didn't work cleanly taking it apart since the crank is shot anyway so it looks worse than it is, but yes, there were contaminants in the oil which origin's I have traced back to a clear mea-culpa; I made an error in assembling that probably caused a small amount of contaminated oil to be released into the bearings which caused most of that circumferential scuffing.

That being a bit beside the point, I'm wondering specifically how different journals can exhibit a barcode-like identical wear pattern perpendicularly to the circumferential wear-marks. They are profoundly distinct from any regular wear I have seen before and around the internet. Thanks for your resource, I'm reading it as we speak!

I'd happily discuss the post-mortem as well, maybe in another topic or once I found an answer to the above. The bearings that came out after 80.000 miles looked completely pristine compared to this 2000 mile run, and the engine still ran fine apart from the runout issues that made me disassemble.

Edit:

Upper bearings. Sputter coating is completely gone.