Oldfeller--FSO wrote on 04/30/12 at 16:14:27:
Take the covers off, remove the "O" rings, flat sand the flat surface of the covers on a full sheet of medium sandpaper just until the entire surface shows even sanding marks.
You have likely warped your valve covers a bit by over-tightening them. The existing "O" rings will work fine in the slightly shallower channels produced by the sanding.
Get four new bolts, the over-tightening causes bolt to stretch and can cause early failure, so get some new ones now before they break on you.
Locktite is not needed on the valve cover bolts -- you will be making trouble for yourself as the little bolts like to stretch and snap bad enough as it is -- with locktite your odds of bolt failure just went up a whole lot on the next remove.
I added the locktite because the bolts seemed to have vibrated loose causing my "extra" leak. I didn't think over tightening (and perhaps warping the covers) was the issue because I really didn't wrench them down (a stubby 10 mm wrench was used) but a refacing of the mating surfaces on the covers might be the answer. What do you think about some lock washers instead of chemical bonding to reduce vibration induced bolt loosening?