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I've never had a problem with steel rocker covers. I use cork gaskets, which I glue to the covers with impact adhesive, then apply a thin smear of grease to the cork before installing with the stock screws. Never had a leak, and the gasket lasts for several removal/refit operations. The key is not to overtighten.
Edit - but no, I've never seen cast ones that look like stamped ones.
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