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February 12-16, 2020.

I suspected that there were gremlins in my oil pan. I am far enough along that I wanted to pull the "pack" to get the front end of the truck cleaned up and inspected. I pulled the oil pan and found that two sets of rod bearings were more than a little loose. So, the crank is going off to the machine shop for a bit of weight loss.
One of the heads looks ok (the side with decent compression). the other side had two valves getting ready to get sucked into the head. Fortunately, I have a spare set of powerpack heads that are ready to run.
I found at least one piston with a broken compression ring (the lowest of the low compression cylinders).

the LS swap might be coming along a bit sooner than I expected as well.