I asked because I tried a sealed crankcase pcv with a fixed orifice (under the intake manifold) and had weird oil pressure problems. When I researched it I seem to remember finding others with the same issue, and an article from good source stating that’s what was happening. Of course I can’t find it now. Regardless I went back to the previous setup with a fixed orifice and a one way check valve and inlet air metered through the throttle body and all was well.
