Alright so i'm curious, I have an ls vtec with BC stage 1 cams, ferrera oversized valves, supertech valve train, and b16 pistons. It's running not to it's full potential for sure. Also it has a misfire. On top of that I pulled plugs and found oil all over them. So my first thought is that the valve seals are leaking. Then I asked myself why would brand new valve seals go bad? I haven't actually ripped the head apart and seen the valve seals myself but it's my diag for now. I think the valve lash could be set wrong because that would cause the seals to go bad, the misfire, and the recent tapping that has occured. Would I have needed to set different valve lash from manufacturer spec because of the oversized valves?