Guys, I Know that the stamped steel FE valve covers have long been a source of "controlled seepage" of
oil. This has been a major concern with my FE to small block valve cover adapter kits when the stamped FE covers are used. I wanted to let the readership know that I think I have found a great solution to the problem.
DSC Motorsports in California produces high quality cork FE valve cover gaskets in three different thicknesses, standard 1/8", thick 1/4" and extra thick 5/16". After a long personal battle involving stamped FE valve covers used with an adapter kit on my 351W I tried a pair of the 5/16" gaskets and they are absolutely free of seepage. I began by glueing the gasket to the valve cover lip using Permatex Ultra High Tack gasket cement and then mounting the cover, tightening only to 5 lb/ft of torque. The extra thickness of the 5/16" gasket ensured that there was no interference between the lip of the valve cover and the adapter plate. I hope anyone having a seepage problem on their FE motor can benefit from this discovery.