The new cam created more dynamic pressure. ( compression) just adding to your issues and new rings didn’t really do much. I’m thinking what ever your piston to wall clearances were or are now isn’t good, new rings may of help temporarily. Also thinking if all was ok initially it would’ve been short lived. Its just not sealing up, weather is the rings or valve seals, or A combination of both….just honing and putting in new rings is like a coin toss.
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