It is NOT a one way valve. is it a HOLE. Nothing more. Sometimes the engine needs to inhale air, sometimes it needs to expell air. This is a relief port. SIMPLE. It is common practice to plumb 2 or 3 extra ports into the valve cover, with baffles, to improve engine health and breathing.
I was referring to the PCV valve at the block. Not the hole at the rocker cover.
Originally Posted by Weq
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