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Are the valve covers steel or cast aluminum? I have cast aluminum on my small block and use Moroso blue rubber steel core gaskets. I had a 64 Chevelle SS with cast aluminum valve covers back in the day before RTV. Used Permatex #1 to glue the cork gaskets. I removed the old Permatex with a wire wheel. You can use a wire wheel on steel covers also.
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 Snakebit
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