5.9L Magnum questions

With all the talk of whether or not to inspect/re-ring bottom end, I'm surprised no one has stated the fact/obvious. Any Magnum engine with over a hundred thou on the clock needs the rid shells checked. Plenum gasket is most likely out and it has been sucking oil. Thus, detonation. The upper shells are almost always wore. Only way to know is to look. No piston/rod removal necessary. It's been 50/50 for me on the cam bearings. Mains are usually perfect.