The gasket is not the problem. The stupid cover does not have enough "lip" to hold the gasket in place. Those thicker gaskets would only make it harder to seal. They would fill the "lip" up and you wouldn't have anything to snap on the head. I don't know how many gaskets I've seen hanging out or sucked in around the rocker arms. Poor design. With all the fancy stuff people make for Type-4 engines, you would think someone would have addressed this problem a long time ago.