Just for clarity, you're talking about the valve covers and not the silver NEO valve cover shroud thing, right?
rb25 valve cover - Zilvia.net Forums
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I think the valve covers are steel. (see if a magnet sticks to them) Any machine shop or buddy with a welder should be able to run a bead across the crack and then grind it down to the point you'd never be able to tell there was anything done after you paint it.
