There was zero leakage of oil or antifreeze. I am certain the pitting and gouges are from debris.
The pump gears are hard, but not like tool steel. A file scratches them.
So, I finally got to measure the head today. Got in onto the bench and was rolling it into position and guess what I saw? Metal filings and glass beads in a water passage. Interestingly, the same machine shop did the work back in '96. Maybe cleaning after milling ain't a happening thing.
I didn't find any metal in the oil pan, but definitely hard, rough, very small particles. Also, when I built this motor I capped it off with a polished valve cover from MSA. My search for the source of debris turned up a problem with that valve cover. The vent baffle perimeter is sealed with a material that is extremely hard (probably started as firm and flexible). I found several pieces of that sealant in the debris field. The pieces are quite brittle. If some of these made their way through the motor, I could easily see them causing this damage.
If that is true, then any valve cover is essentially a time bomb. As if there aren't enough things to keep us awake at night. 🤯
Oh yeah, measured the head. It's been cut a total of .106" with .007 off the top (machine shop just did it) and the balance off the bottom. Combustion chamber now measures 43.5cc.