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[font=Verdana, Arial, Helvetica, sans-serif]basically the distance between the thing at the top of this picture and the thing slightly below it, but here's more detail
more here: http://www.superchargersonline.com/content.asp?ID=11
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What is Spark Plug Gapping?[/font][/font]
[font=Verdana, Arial, Helvetica, sans-serif][font=Verdana, Arial, Helvetica, sans-serif]Another method of insuring proper spark is through gapping. The term gapping means to provide an adequate jumping distance for the spark to terminate. Gapping spark plugs is very important in both non-supercharged and supercharged applications. The average spark plug gap between the electrode and the ground is determined by the engineers that have designed the ignition. Usually, when an engine is converted to being supercharged, the gap is reduced to approximately.032 to .035. This reduction in the gap helps prevent whats known as spark blowout" due to the increased amount of fuel and cylinder pressure. The higher the cylinder pressure the harder it is for the spark to occur. The ability of the spark to actually take place is enhanced by decreasing the spark plug gap.[/font][/font]
[font=Verdana, Arial, Helvetica, sans-serif][font=Verdana, Arial, Helvetica, sans-serif]A very common problem that is seen time and time again is an application that runs smoothly until about 3,000 rpm. At that point, the engine usually sputters and the power that was being created has become non-existent. If you find yourself saying, "I cant get this car to runI have no idea whats going onits not running properly..." - Check the spark plug gap! More often than not, once you properly gap your spark plugs, all your worries seem to go away. It really is magic![/font][/font]
[font=Verdana, Arial, Helvetica, sans-serif][font=Verdana, Arial, Helvetica, sans-serif]How to Gap Your Spark Plugs[/font][/font]
[font=Verdana, Arial, Helvetica, sans-serif][font=Verdana, Arial, Helvetica, sans-serif]When gapping your spark plugs, it is recommended that you always use a spark plug gapping tool. This tool can be purchased at most any auto parts store for approximately $2-$5 and is a MUST to have in your tool bag. This tool has a fork that is designed to be attached to the spark plug ground. Once that is complete, you can safely increase or decrease the spark plug gap by bending the ground wire. (If you're not 100% sure how to perform this or any task, it is always recommended that you seek out the services of a trained professional.)[/font][/font]