Hello. I have a question about the hole in the valve cover that goes to the intake. Is there some sort of valve on it or is it just a hole? Me and my grandpa were working on my truck and he pushed a screwdriver in the hole to see if it was clogged and he said he felt something soft fall out. My question is whether this was just some sludge that was knocked loose or a valve of some kind. Here is a photo of the spot on the valve cover I am talking about. Thanks!