Originally Posted by
THETESTER
I take your point. You would think once something was tight it would stay tight forever. I am not one for using Loctite on threads as I have seen what can happen when it "works" better than expected and you shear a fastener.
I let them sit 30 minutes, maybe an hour but I think 30 minutes. I then tightened them to spec, before putting the valve cover/breather assemblies back on the car.
I used Ultra Black RTV, new valve cover gaskets and a new bolt set - no locktite. It's been four years, and around 21000 miles. I've never tightened the bolts again (other than two months after the fix). Not a drop of oil on the engine today.
I DO suggest you check the tightness from time to time, even tho I have not. Also, consider changing the gasket under the oil fill cap while you are in there, again, I didn't but it would probably be a good idea.