PCV leak

67 gt said
Famous funny thing is I’m running the same but 2pcv in the sniper one on each bank and has stoped my rear main leak. Have been running it this way no sign of oil in the manifold anywhere and no leaks . Have put on 6k with no issues. With 1 pcv and one breather opposite side it would leak from the rear main.

Have you given any thought to the dual PCVs sucking atmospheric air into the crankcase at the formerly leaking rear mainseal, because you know, that the rear main seal is designed to prevent pressure escape.... not pressure intrusion. You could consider it a one-way valve.