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Spark plug gap

Engine

Vehicle Information: Model: 911Sc Targa; Year: 1981; Body Type: Targa; Total Mileage: 147000 km;

I have a 1981 911 SC and bought a PermaTune ignition module for it recently. The motor is a stock 3L with 9.3:1 compression. I just bought new standard plugs ( Bosch W5DC ) and would like to know what gap you think will give me the best burning spark.Thanks

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