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its gonna depend a lot more on head flow and cam choice than compression alone.

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The heads and the cam are the heart of the motor.

I've seen tests in mags where they took a motor, dyno'd it, then started adding gaskets to reduce compression. The loss of compression had a surprisingly small effect on the peak hp.

Most builders say 1 point of comp alone will only ad 3% to a given combo.

The combo needs to be matched. Obviously you wouldn't run the same cam in a 10:1 iron motor, as a 14:1 alum motor. Add in that it is pretty unlikely that you'd ever get a iron head to flow like an aluminum one. Not because of the material, just because the alum head will be designed as a performance head.

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