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Picked up another manual on the D4800 series. One table in particular has some interesting info on EGT: 1200°F exhaust at 0°F ambient. Quite a bit hotter than I'd have guessed. Note that this would increase proportional to the increase in ambient temperature.
Also lists cooling airflow...
There was a production change to an undercut valve guide but it also appears to have been a kit to fit the earlier engines. Unfortunately, I don't have any part numbers. An ag dealer may be able to help you.
I live two hours from my truck so, instead of actually working on my truck, about all I can do is accumulate parts or do research. I picked up a copy of the 1981 engine technical manual for the White D5000 which is the engine used in the 2-155 farm tractors (among other industrial...