I'm certain that was the problem. There is no internal oil passage between the oil pump output galley and the oil galleys serving the engine. The oil flows into the filter and then into the oil galleys. There is an internal oil pressure relief in the filter. It allows, when the oil pressure is high when the engine is cold, for oil to flow into the filter and not go through the filter media. The oil still has the enter the filter to get from the oil pump output galley to oil galleys serving the engine.
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john
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