For the first hour tonight I replaced the cork valve cover gaskets with the silicone ones I purchased from Vans. These will last much longer and give a better seal. The torque on these are not the same ast the 40-45 inch pounds on the cork, you should only tighten until the gaskets start to squish out a bit.
Pretty
Old and new
Done deal. Might have to trim these a bit when installing the Baffles.