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You can hook up a quality undampened gauge to the oil pressure port, and read the oil pressure at idle. It should be steady at the needle. If the needle is really bouncy, that's indicative of a worn rod bearing. As the rod bounces up and uncovers the oil gallery, the pressure will drop (because pressure is resistance to flow) and then when it comes down to cover it the pressure will spike. Beside physical inspection, that's probably the best way to diagnose a rod bearing.
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