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In a couple posts down from the top....says ECT was staying at 198. If the pump wasn't working, it would probably have melted already. 258 is defuel.
With all the oil coolers in and out... the OEM oil cooler is not in the block, correct? It was removed and you used a what brand external cooler, 2 weeks after the second one was in.. why? Was it showing signs of clogged up or large split between temps?
If the oil cooler doesn't have clogged passages, it has to be the bypass.