My understanding is that you need to resurface it when you put in a new clutch. It has to do with the clutch setting a particular wear pattern or grip pattern on the flywheel. I put a used clutch in my car a few months ago, but I put in the matching flywheel too, so I never worried about it. I just put in a new clutch last week and resurfaced my original flywheel. I guess it'll work without resurfacing it, but that's alot of work to not be sure, and possibly have a clutch that slips at odd times. Just my .02
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