Small vid about PCV

OEM has been doing it like that since about 1963


Not like that. It’s like AJ said. With a breather open to manifold vacuum when it drops at WOT any blow by will go right into the engine. The OE’s didn’t do that.

They have a breather that’s open to atmosphere so at WOT the blow by can go somewhere other than the engine.

IMO, the guy who made the video should have just blocked off the open breather all together and just let the PCV pull a vacuum in the crank case.