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the shop i used to work at had used cometic head gaskets with everything we built that a stock head gasket cannot handle(unless it was a honda engine that came with a stock metal head gasket). but if we bored out the engine bigger than a stock head gasket, we used cometic head gaskets. we used head studs and a product called hylomar. hylomar is like a spray adhesive that we applied on both sides of the metal head gaskets(even on stock honda metal head gaskets). it`s like copper spray but works way better. we had an sr20 powered 91 sentra that had cometic head gasket. i`ve built an ls vtec that was bored out to 87 mm(stock is 81 mm) that made 618 whp with cometic head gasket. like what waxball88 said, as long as both mating surfaces are resurfaced, cometic or metal head gaskets are perfectly ok, from my experience anyway.
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