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I think the stock plug is around .030" and I brought mine down to .020 for my stage 2 set up. The reason for a tighter gap on the plugs is when you make more power, you're burning more fuel and you need the spark to be smaller and more concentrated. See below:
A wide gap creates a longer spark arc but without sufficient "juice" from your ignition system, (including amps), can be weak. A small intense spark is MUCH better than a big, weak spark, especially when dealing with richer fuel mixtures and more volumes of fuel being burned.
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