I have a 99 LS1 and when I did my h/c I changed to the LS6 valley cover and ran the pcv according to LS1HowTo.com and also through an AMW catch can. I can hear the little ball rattling inside the valve and I am catching oil in the can, which is up front in front of the radiator. However, I did some work recently on my intake manifold and although the front of the throttle blade was clean, the inside of the intake had a lot oil pooling in it on the bottom and my intake runners had a thin layer of oil in them. The car doesn't burn oil, just a quick puff of blue when you gun it. I'm assuming it's from all the oil in the intake and runners, because it didn't do it after I replaced the intake, all cleaned up of course, and cleaned the intake runners. I know it's probably going to come back unless I can figure out what's happening.
How do I verify the pcv mess is working properly?

 

Try putting a filter in the pcv line, and run it that way for awhile, then check for oil in the intake again. I have a stainless kitchen scrubber type filter permanently installed in mine (no "catch can", which I've tried before and didn't do much except catch water).

 

Just get rid of all your pcv together and just go with a breather