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There has been discussion about grooving heads. If you poke around a bit on google or maybe even here you can find a paper written by a guy who did some testing with a Geo Metro engine. The change isn't drastic, but it is worth looking into if you are going to be rebuilding a head. Of course, if you have a 4 valve per cylinder engine, like SVOboy said, you likely don't have anything to groove.
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