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I not sure but I think the 4% general rule for compression ratio/power difference refers to peak hp. Torque at the low end can be effected more.
Take it as a general rule of thumb.
Even at that if you were limited to running economical 87 octane gas (and the limited cr, you'd still have a pretty good motor. Mostly because the cam is fairly mild as cams go and the heads are pretty good. Should work well.
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