One of my winter jobs was to remove the inlet manifold, clean the valves and then fit a catch can from the sump vent to the inlet manifold. Rather than vent to atmosphere I decided to go back into the inlet manifold to create the suction to draw the fumes/oil into the catch can.

https://www.talkmorgan.com/ubbthreads.php/topics/792499/re-workshop-note-gdi-oil-breather#Post792499

Roadster 3.7
Plus 4 110 Anniversary
Plus 4 Fiat TC