I'll defer to someone more qualified to answer that
@The_Josh_Bear. This is my first time wrenching on a 7.3 IDI, although I got 2 under my belt now.
Got the engine transferred to the stand and drained the oil out of it. Not a hint of coolant, just very dark motor oil as expected with any diesel. I then cleaned off the heads and checked for any warpage. There was none at all.
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I then removed all the valves and found that the stem seal on all 8 exhaust valves had disintegrated:
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Everything otherwise seems to be in good shape with the stems being nice and snug in the heads. Some of the valves were pretty dirty:
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What's the best way to clean them? Ultrasonic cleaner?
Next I pulled all the pistons:
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2 of the top compression rings were stuck in #4 and #8. #2, #3, #5 and #7 had broken 2nd compression rings. #7 also also had a broken oil control ring.
The good news is the pistons themselves look ok (except that one with the dings in it from the glow plug. There's a hint of side play in the wrist pins, but I don't think its enough to worry about. They also popped out real easy, so no major ridge in any of the bores.
Crank journals all look good:
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I'll take a micrometer to the journals tomorrow and also take a closer look at the rod bearings to see if they are standard size or not.