rtv usually will just make the gasket slick and slide around when you tighten the bolts. I like to use the cardboardy type gaskets vs cork as i always overtighten and crush the cork to smithereens. Clean the bolt threads well and use removeable locltite on them so they wont back out. torqure to spec (which is something like 15 ft lbs- look it up). and more and you crush the gasket. any less and they can back out. criss cross as much as you can