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The first limitation is the valve springs. With stock valve springs and retainers you should not exceed the stock 964 rev limit. I don't know what that is, but probably around 6500. The bottom end is good for 7000 with occational trips to 7500. With stiffer valve springs and/or titanium retainers the valve train will be good for 7500 or so.
-Andy
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72 Carrera RS replica, Spec 911 racer
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