The breather valve is operating correctly. The breather cover deals with two separate parts; breather valve, and oil pressure switch. The OPS has a passage where oil is pumped up to it by the oil pump.
Extra info: All new head gaskets on the engine, new shaft seals, no visible leaks in those areas.
So I'm going to try the new cover/gasket and spin the oil pump. If it still leaks, then I need to open the block up, find those passages and see what's blocked.
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