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I took the valve cover to dealership and had a friend run it thru their automotive dishwasher with other parts for 30 minutes. When the tech came to get his parts he told me about the updated valve cover design. The parts department had it in stock and venting design was considerable improved, so I went with the new design. If I can find pictures showing the difference, I will post them.
Thanks for the post. Those pics show that GM has a few different design changes on the drivers side valve cover. I have never seen one like your original one at the bottom of the pic. It has 3 holes roughly 3/4" diameter in the vent chamber. I have seen the revised updated cover with the large rectangular hole.
My original 2004 valve cover has no removable PCV valve. It just has the fixed orifice in the PCV connection. The valve cover on my 04 only has 1 round 3/4" vent hole, in addition to the slotted holes that run across the bottom of the vent chamber and one tiny hole on the end where the hose connects. It looks exactly like the valve cover in this video.
I did enlarge the small hole at the end where the hose connects to 5/32", as the gentleman did in the you tube video. When I pulled mine off that hole and the slotted ones were all caked solid and not breathing venting anything. The round hole was not even visible due to caked on oil from 300k miles of use. I was not lucky enough to have access to an automotive dishwasher so I cleaned up as best as I could with rags, brake cleaner & compressed air. It is venting again, but it's a messy job.
If the OP has the same plugged up valve cover, that increased crankcase pressure could exacerbate an oil leak.
