It's the distance between the inner core and the electrode which fires up in a sparkplug in all gasoline engines....
How to Set and Adjust Spark Plug Gap
If you're replacing the spark plugs in your car
engine, you'll need to set the gap before reseating the
spark plug. The gap is the distance electricity arcs between the ground
electrode and center electrode. The gap must be set correctly to ensure
maximum performance. Here's how to set the gap of a spark plug.
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