OK Gus,
I read the thread, yet still would like to know what the difference is between the different values...like how does an A3 differ from a Fox #8. Length only? What is the hottest plug I can or should use and why? Why would I use a hotter plug or a cooler one for that matter, engine life? What are all the different plug sizes I Could use if I choose to?

Still trying to lean "everything" at once. Can't fly, to darn windy and th snow keeps piling up, no matter how tall I make the skis .

Lefty [sm=thumbup.gif]