Google "sparkplugs", search sparkplug+reading or read the back of a Champion catalog, that will explain how they should look when in the proper heat range, and about rich/lean or detonation conditions. We read plugs for the locals all of the time, mebbie there is a local racer that can help you. Bring your used plugs(without touching the electrode ends) to your local dragstrip and ask someone that runs a fast car to help you. By the time they work themselves up to a 9 or 10 second car, they should have a grasp. You could post large, detailed pics and I probably can get you in the direction. TIMINATOR