Anyone fabricate their own exhaust heat crossover blockoff plate?

Get some stainless steel sheet metal, 28 to 24 gauge. Cut it so it's about 1/8 to 1/4" " bigger than the opening in the intake manifold. Carefully glue it to the intake manifold with RTV. Sandwich it between the intake gasket and the manifold, and bolt down the manifold. An easier way is to get some intake gaskets that do not have the hole like Fel Pro #1213S3. These will work because they have a steel core.