shaving heads but using less than 92 octane

I have a 3.4 v6 out of a 94 camaro in my fiero, I am wanting to shave the heads for a little more compression but I'd like to use mid or regular grade gas, is this possible and how much can I shave.

Youd have to figure out what the current compression ratio is and find out how many ccs the combustion chambers are on the heads. Then you can figure out how much to shave so that you dont raise the compression too high.

bust out the calculator...