This is one thing that GM has spent a lot of trial and error on.
After multipe different arrangements, the best setup by far is the PCV in the forward end of the left (driver side) valve cover, & the breather end (or tube to the air cleaner) on the aft end of the passenger valve cover.
This is how you want to do it. Inlet on the passenger side (air sucks in), exit on the driver side (fumes sucked out by engine vacuum & injested into the engine thru the PCV valve).
Since the PCV vavle is a one-way check valve, running 2 wont work.
Last edited by tjet; 02-02-2012 at 04:27 PM.