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I have a stock intake manifold with exhaust crossover. I heard there are gaskets with a blocking plate to block off the crossover. I think Fel pro makes one. Anybody got the part #
MS90314-2 is for 69 - 82 chevy sb's. You can see a good picture of it on Summit's web site. It shows what appears to be 2 separate exhaust cross over block off plates that are optional pieces that come with the gaskets. However, they appear to have small holes in the middle of them as well. This is consistent with the Felpro's I just used on my performer intake except they were an integral part of the gasket. Hope this helps