I know this is the wrong place for this but this thread sees alot of action and I didn't know where to correctly post this question.... So I am guessing that the lower hole is for a low port egr valve but I don't need it because I will use the other one. I am trying to come up with a way to plug that hole and I have been to every hardware store and parts store and even a place called fastenal that deals mainly in bolts. Welding is my last resort. Help me find a way to make this happen.