Apparently it doesn't have one in the usual sense. It's actually built into the valve cover itself from what I've been told. And get this, it is not replaceable as a $10 item as you would hope. They expect you to buy a new valve cover to fix venting problems. Of course in the course of changing the valve cover, you will need a number of gaskets as well and about 6 hours. There is no way to avoid taking off the valve cover, but try cleaning the vent orifice before going out and buying a new cover.
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