No offense but i highly doubt you can look at a plug and know what it means. It really is a lost art. There is tons of misconceptions of what to look for.

http://www.ngksparkplugs.com/techinf...q/faqread2.asp
http://www.corvetteactioncenter.com/...ark-plugs.html

Smokey Yunick has written some good things on how to read plugs.

But for you, you cant use it to TUNE a car, a wideband is much more efficient