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Most tuners will start at .030" for a reasonable boosted setup. The closer the gap, the less energy is required, of course, and the dynamic compression of a boosted engine will increase resistance in the combustion chamber considerably. The larger the gap, however, the more energy is exposed to the fuel/air mixture, increasing the efficiency of the light-off. As ismael-robert said, a high-power ignition system, such as a comprehensive MSD setup, will allow a larger gap, but of course only the dyno tuner will be able to show power gains reliably. I run NGK 7 series plugs at .030", with an MSD 6AL-2, Blaster 2, wires, cap and rotor on 9psi, and was told by my tuner that there is little gain in opening the gap, but there are gains to be had. Also, remember to use a prong-style gauge, and not a ramp style gauge if you're very serious about a very good gap. Good luck!
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