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Think your on wrong thread.....however, check pcv for proper operation, this may be what's causing pressure in the crankcase, could be head gasket or timing cover leaking just enough to contaminate the oil but not enough to notice missing from cooling system, and the knock may only be a lifter as your oil has been water contaminated. This would be a best case scenario for you. But like you said, probably need to tear down and in spect.