[Argess]

I didn't find the rubber worked any bettter or any worse than the cork. In both cases, I needed to use Permatex Aviation Sealant (gasket shellac.....used to be Indian Head....looks like molasses) to make a decent seal.

Cast covers make it easy for a coated gasket to "squirt out". Best way I have found is to glue the gasket to the cover with the gasket shellac, let dry overnight. Then coat the exposed cork and torque it down snug. After yet another 24 hours, tighten a bit more.

Some attention should be made to trimming the intake manifold gaskets as they usually stand proud between the manifold and the head. They have a metal center, but a good razor blade (or very sharp utility knife) will slice them off flush. RTV in this area is not required. Just make sure you use gasket shellac and re-torque a day later.

Since I had to do this with rubber as well as cork, I now only use cork as it is cheaper. On the other hand, the rubber ones can be used a few times, so I guess it's really just personal preference based on whim of the day.