Differences between leading and trailing spark plugs??
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Senior Member
Joined: Jul 2001
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From: new orleans la
Differences between leading and trailing spark plugs??
Is there an actual difference in the plug. I know that the leading plug fires first and all. And the trailing fires second to help efficiently burn all the gas. But i was wondering if there is an actual difference in the plug. Thanks alot. -Jeff
Z06 powered FD
Joined: Mar 2001
Posts: 1,883
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From: Dallas, Texas
Yes, one burns hotter then the other. With NGK plugs the heat range is backwards then most domestic plugs. Stock you have a 7 and a 9 heat range, 7 is hotter, 9 is 2 steps colder. Most people run 9's all around and that would matter which hole they went into.
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