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Old 08-20-2009, 08:49 AM
  #6  
CamBirdRacing
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Join Date: Feb 2009
Posts: 510
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The reason for this, I believe, is that the more sharp edges you have on a plug, the more spark you can get out of it. This is one of the reasons I use NGK or ND plugs. I can't remember the last time I used an american plug in a car.
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