I used those exact gaskets in kit form to replace the valve cover gasket, valve cover to rocker seals, and rocker to head seals to keep oil out of the spark plug tubes. It was so easy, my 12 year old helped me. The gaskets don't leak and I didn't see the need for permatex in the corners, but I ended up having to use a very small amount to hold the gasket in place so it wouldn't fall off when I flipped the valve cover over to install it. Hope this helps!