Well I had oil into a spark plug tube due to bad seal. I ordered fel-pro replacement valve cover gasket set after comparing my stock onesvalve cover gaskets they look flat on one side and tapered on the other but the new fel-pro set is tapered on both sides??? Does this seem right and did my stock ones just flatten on one side from the bolts torquing them down over time??? Part numbers on fel-pro box check out as far as I can tell...