Steve sorry it took so long to get back (dead Computer). I do work for Champion but I am strictly on here as a hobby. My hole family is into cars so from a young age up (now 41) I love them. Dad has a 54 vette that we restored, my uncles had mustangs and A's. Now I love them all. I found this web site looking for parts for my friends 1912 Franklin and decided to join. And getting to work at Champion in the Prototype lab building the next great plug for the next great car is like a dream to me. I did not see it was a old post thanks for the tip. This is a link I found on line that looks good for trying to figure out what will work or if you give me some info i could try to look it up also Champion sparkplug symbol code decode Spark Plug Numbering System, Spark Plugs Symbol Code, Symbol Key, NGK, Champion, Denso, AC - Cixi Meiya Automobile Parts Co., Ltd. Most people have no idea how much tech goes into a spark plug. It looks simple till you get into all the different combinations. I am looking for a reference chart to help in applications. I believe this would help a lot of the problems. Torque on most 10 MM plugs should be 17 ft lbs. Thank for talking to me I hope to be on and see what is up. Also where do I go to put the cars I own a picture under my name? Jeff