PVC breathers on valve covers

You should be running a PCV valve when ever you can. There is a new aftermarket PCV valve that is expensive but adjustable. I can't recall the name but I'd bet if you google PCV valves it will come up. It is the only adjustable PCV valve I know of.

If you really want to hot dog it, ise the PCV and pan evacs. That's what I'm doing on my new engine. If you stop and consider how both sytems work, it may make sense. BTW, Bill Jenkins did it years ago. Most guys now run a vaccuum pump. I hate the electric ones and I don't want to spend the money for a belt driven one.

You can use all the crankcase evacuation you can get.

If you are just going to use the PCV then have it on the opposite side of the breather. If you are going to use the PCV and pan evacs then DO NOT use a breather.