Sometimes when you remove the valve cover, the studs that hold the cover down become partially screwed out of the head. Then when you replace the cover and tighten the nuts, they tighten with a space under the cover and the gasket is not being squashed and this results in a leak.
Remove the cover again, screw in the studs all the way then replace in the normal way.
I chased a leak for a while there and even replaced the cam shaft seal before realizing the problem. It always seems to be the studs on the ends of the head that do this.
Steve
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