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I would also rev it to 6000 without worrying.


It may stay together and may or may not even float the valves in a stock 440 at 6000 but why twist it that far when it will peak long before that and you will be far better off shifting earlier. (and easier on the motor too)



The op hasn't said what he's got for cam and head flow, but I agree that if it's out of breath long before 6000 there's no point in taking it that high. But if it was peaking out higher in the rpm range I wouldn't sweat taking it to 6k.