Mark the stud anyway that you can so that when you back it out You can Cut it off Then Reinstall it. Also Be sure to use a sealer on the treads.And Now depending on the valve cover you use the Cover may also need a little triming TO clear the Upper part of the stud Or Nut.

Larry/Twisted6
[oooooo] smile
Adding CFM adds boost smile
shocked God doesn't like ugly.