7500 RPM won't have much of a GRUNT feel. Because torque fails away the faster the engine spins even while HP increases. Keep max HP closer to 5200 RPM for a GRUNT feel.
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I'd be satisfied if her cams are cut to limit her at 7500-8000rpm, as long as she has sufficient GRUNT (I grew up with RB30's and V8's, so chassis-twisting torque over HP for me, thanks)
Note how the RB30 makes max HP below 5600 RPM and big old V8s below 5000 RPM. That's the grunt we are used to.
If you can use up to 1900cc in your class, why not go to 79mm bore AND go to 88mm stroke? That will make 1725 cc. Better yet go to 80mm pistons (if the block permits) with 88mm stroke for 1769 cc. Yes, peak high RPM power won't increase all that much (limited by the head flow) but low RPM power will be vastly increased.
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Do I bore her another 2mm to 79mm or do I stroke her to 88mm? Either increases the cc. Right now she's the underdog in her class (Circuit and KOTM), and class won't change 'til I cross the 1900cc mark.
To get 88mm stroke, guys slightly modify the Nissan E16 crank, which almost fits in the A15 as-is. If you are seriously involved, order a custom billet crank for a 15mm stroke increase.
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