I have a new to me Limited (non sport, 3.8) Montero and I'm in the process of getting her back to good. But the one thing I can't seem to locate is the PCV valve. Can anyone give me an idea of where it's hiding please?

 

PCV valve would be located on near the front of one of the valve covers. Attached are couple of photos showing PCV location on different styles of engines. Yours should be looking like one of these. You may need to take off some plastic covers from the top in order to see it.