D;
There WAS a "ring problem" as two broke and there was NO mention of any leakage.
New/rebuilt engines usually run SAE 20 oil during 'break in' and then heaver, depending on the type of operation planned etc. Using SAE 40 or 50 during that period is NOT 'normal' either.
With 40+ pressure all the bearings should have run just fine. Why there was a failure there is a mystery, I guess.
As far as the pin bushings go; this may be due to the higher compression and advanced initial timing, (higher combustion temp) hard to say. They may have been to tight to start-off & the heavy oil just didn't get in there enough.
Those MOPAR flatheads ran forever (almost) like you say, till they were replaced in the 60s.
Sometimes "stuff happens".......
Good luck to all.
