V-Power is copper too and is easier to gap. As far as "performance" plugs, what IS a performance plug? A more expensive plug? A spark is a spark. A timex will keep time as well as a Rolex will.

Other than gold, copper is the best conductor of heat. It also requires less voltage to produce a spark that platinum or iridium. So, why would someone want to run a plug that requires more voltage to operate properly and will not remove as much heat from the cylinder?

The ONLY advantage to a platimum plug is that is may last longer.

Here is what the number mean:

http://www.ngksparkplugs.com/docs/te...tnumberkey.pdf

 

lots of good stuff here... so, DD did you go with the plain jane plugs? Im due for for a plug change soon...

 

I thought I posted this. Sorry, I must have posted it somewhere else.

Anyway, I went with the V-power NGK's. They're copper too, but a little better performance (who knows?) than the standard plugs. My tech and NGK decided to use a plug one setting cooler though (#7) because of the supercharger and other mods. They did not change the gap. They weren't comfortable altering the gap and since they were going to warranty their work, so to speak, I didn't feel comfortable pushing it if they weren't comfortable doing it.