The text book answers are the way to go . For an inframe budget rebuild you replace parts if you can manually wiggle the valve at full lift or the the head of the valve has less than a nickels thickness between the seat angle and the flat head of the valve .
The reason I posted this is because I see a few folks parting out tractors because they believe it would be too expensive or too much effort to get the old gal running again .
Hastings rings says their rings will seal a .010 tappered bore but the text books recomend tight gaps that would require most used parts to be replaced . While technically their way is much better , thesel old tractors will run a very long time after a refreshment of rings and a few bearings . I would spend the money to rebuild the oil pump as they are a weak link .
These are not modern motors that need to turn 4K + rpms doing 70 mph down the freeway for 200K + miles .
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