Craig, What are you doing for allowing air back into the engine? I think I would 2nd Otto's comment about the placement of the PCV valve. In this
2020 thread on the same topic there is a mention by HRL about the port being about valve cover height to prevent oil getting sucked out of the crank case. I believe there was another more recent thread on the subject, but not finding it just yet this morning. I need more coffee!
