I replaced my valve cover gasket and the spark plug well sealer gaskets on my 2004 Mitsubishi Lancer recently because of an oil leak. The previous owner (or his mechanic) had over-tightened the bolts on the valve cover and which has resulted in some deformation of the cover around the bolts. I also noticed some marks on the inside of the cover indicating that two of the valves have been touching the valve cover at the top of their stroke.
The issue I'm now facing is that when I tighten the bolts on the new gasket to the specified torque I get oil leaking into the spark plug wells.
I tried tightening the bolts a bit more and that causes all the valves to knock on the cover. I loosen them and I get the leak in the spark plug wells again.
What do you guys think of using some RTV to fill the gap between the spark plug well gaskets and the cover?
What are the risks?