After reading all of the other comments, here are my thoughts:
Just having been overhauled does not insure that it was put together correctly. It was put together by a human, and humans do occasionally make mistakes. Like not checking for the proper ring size. Like having all of the ring gaps lined up. Like not having a proper hone finish in the cylinder bore. There could also be issues with valve stem seals.
Regarding using any abrasives, I would say use extreme caution. While they may aid in seating the rings more quickly, they may also linger and cause premature wear of the rings/pistons/bores. So, once you put them in, how long does it take to get rid of them?
For diagnosis, I might suggest that you do a leakdown test before taking anything apart. That would help to either prove or disprove a ring problem.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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