| You should be able to support around 500RWHP with NGK plugs gapped to 0.035"-0.030". If you find yourself having to shrink the gap further than this, you may want to check your coil packs' resistance to see if they may be getting weak. Refer to the FSM for the diagnostic procedure located in the EF&EC section. The OEM coil packs are quite robust though and on very few occasions have I seen problems with them. I recall when we were building the Peacemaker, we were running a 0.025" gap and that supported us up to about 750RWHP (at 32psi of boost) before we had to add an ignition amplifier to the setup. If you find yourself falling short of this benchmark, I would first try locating a newer set of coilpacks to test with and purchase new units (or low-mileage units) if necessary. If you do have to use an ignition amplifier, you can set your gap back to 0.035" and be able to run high boost (>30psi) without any misfire.
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