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technically both things limit your rev capabilities, ive heard sr bottom ends can do 8000rpm in stock form but the head is your main concern here, solid lifters, stiffer springs, titanium retainers, and solid cams can rev to 9000rpm or higher but then the bottom end cant keep up, the fix is to balance the entire rotating assembly for the rpms you want, once balanced there should be no problems in revving the crap outta the engine
gtautosound.com has a drag sr that revs to 9300rpm, maybe you should email them for a better explanation
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