I recall a warning to watch for oil smoke from the fill tube during engine/cam break-in. Makes me wonder if it might be wise to disconnect the PCV before start-up, or would manifold vacuum at 2000-2500 RPM be inconsequential in that regard? Or, would it be a definite advantage to eliminate corrosive blow-by fumes until break-in is completed, and a protective zinc layer is laid down?

6 VOLTS/POS. GRD. NW INDIANA