View attachment 1405933 I was expecting to hear that the block or crank were bad but they are fine for rebuild. Cylinders will be +30 or 40. #4 is pretty close for the 30, it has the most wear and tapir - wider at the top. Most likely caused by the broken ring.
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These two valves should be nearly identical.
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This bearing from one of the rods - not looking so good
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The timing chain tensioner:
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And the winner is me because I am not sure this truck had many miles before a catastrophic failure and yet not! Safely driven into the garage.