I forgot how the old saying went exactly, but, stands to reason, new rings put more pressure on old valves. Visa versa? New rings and valves put more pressure on rod bearings. Which would put more pressure on the old mains... so it goes I guess... the time and money for a complete rebuild will be time and money well spent... 'in frames'... just ain't a rebuild in my book... just an in frame 'repair'.....
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