Breathers, PCV question

Dusted73 said

I have mopar performance valve covers that only have a vent hole in one of them and oil fill ports on both. Should I drill a hole in the other and put one hose with a pcv to the carb or intake manifold and the other side to the air cleaner? Other question i have is I'm running a open air filter with bottom and top lid, should I drill a hole in the bottom lid and put a fitting in?

Click to expand...

The hose to the air cleaner is sorta optional; you can run a breather on the valve cover with an atmospheric dump. The thing is;
at higher rpms,
and at WOT,
and especially as the rings get older,
the PCV system cannot keep up; so the breather starts to work backwards, and pukes blowby gasses, usually with plenty of oil in them, onto the valvecover, making a mess.
The other thing is, people forget to wash that breather out from time to time, not remembering that it is inhaling dirty air 100% of the time.By hooking it to the air cleaner, on the carb-side of the filter, it gets already filtered air. Furthermore, because that connecting pipe has a generous size, and is several inches long and all uphill, any oil in that column has a tendancy to drain back into the breather which is a good thing.