[undy]

A little negative crankcase pressure is good for the engine. It keeps things well ventilated, recircs/burns unburned hydrocarbons and actually does help ring sealing, to a small degree. Plus, it's always embarrasing to me to have visible vapors coming out of your valve cover breathers.

The way Brent sets his up is the same way I do, breather in one valve cover with the PCV in the opposite one. It sets up a nice cross-flow ventilation through the engine.

Two thumbs up for the venerable PCV!