I have a Eldebrock Air Gap with the raised runners, and a valley pan made into it & it leaks like a sive if I don't get it tightened down right & keep a check on it. I have to re-tighten it about every 6 weeks or it will leak around the front seal & oil will blow back under the carb. I think it over expands at the valley, and causes the rubber seal to leak. I have tried Loc-tite, rtv blue, bubble gum, and it still does it.