Jerry You might need to check to see if the bottom edge is flat. Put it on a flat surface and go around it with a piece of paper or feeler gage to see if there any gaps between the bottom edge and the flat surface. I have a Waynes valve cover on mine and had to take to a machine shop to have them sand it flat along the bottom edge. It cost about 10 bucks, but it works great now.
Good luck
George
