[Dave at Pelican Parts]

TMK, a more-common problem than warping the cover is simply sucking the gasket in. When you run hard at high RPMs for extended periods of time, you can develop a good vaccuum in the rocker box. This can sometimes be more than the vents can handle, and if that happens then the gasket can get sucked in.

The solution to that is gluing the valve gasket to the valve cover. I have heard of people using everything from RTV (in small amounts, please!) to carpet glue, to engine case sealer. But it seems to work.

--DD