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I wouldn't replace the rod bearings at 75K miles unless you are in there replacing the oil pan gasket. My N55 with 90K miles had a spun bearing. I polished the rod journal, replaced with new bearing, but the rod knock exists due to the rod journal is out of round. Still debating whether I should replace the crankshaft or replace the engine.
1) should I have to resurface the block and head or just clean them up? last time I replaced the head gasket in my Honda Pilot, I did not machine the surfaces, and the engine still runs as new and no issue since.
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