I recently noticed the ribbon ground wire connected to the upper firewall on the passenger side was not connected to anything. I recently had a valve cover gasket replaced, but can anyone show me a pic or diagram where the loose end of this cable attaches to? I'm assuming to one of the valve cover bolts, but want to make sure I do it correctly. Thanks!

It really doesn't matter where it's connected as long as it's connected. Valve cover sounds right.

Likely is a bolt on the VC. Ground is ground the world around. Can't have enough of them. VC to firewall sounds logical to me.

Yeah, it's very often overlooked when changing a VC gasket.

The braided ground wire on firewall, near valve cover is for radio-noise supression. It connects to one of the extended valve cover bolts, on top of nut then a second nut is added.