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well, stroke has alot to do with it. an RB25DET has the same cylinder width as an SR20DET, but typically readliens a few hundred RPM higher. why? because the stroke is shorter. since theres more cylinders, you can use the same width and shorten the stroke to achieve the better displacement but free-er revving. RB26dett's can go all the way to 10k (although its not recommended), and i've heard the tach on the 400r goes all the way to 12k.
however, if you want to be able to rev more...and even if you dont really wanna push it that far, but want better pickup at the high revs...I would suggest getting dual valve springs and titanium retainers. this wont even cost you a couple hundred dollars, but your engine will be much more responsible in the high RPM's. if you wan tot really push it, get newer, reinforced valves. these are also relatively cheap, and will take alot more punishment in a highly tund N/A or F/I engine. i think ferrea makes some valves for the KA? if they dont, im sure someone else does.
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