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12. The Firepower ignition system from Performance Distributors I installed awhile back works great and will facilitate a plug gap of 0.065 of an inch. The larger plug gap leads to a more complete combustion of the fuel mixture, which in turn provides more horsepower, better gas mileage, and cleaner spark plugs. After gapping the Autolite plugs, I installed them and plugged in the yellow LiveWires.