Another plug that I found to run great and last
in my Clocked JL is the Dynamite #7(med.) turbo
plug. I had the engine tuned for the med. Picco
plug and when I switched to the Dynamite plug,
I didn't have to re-adjust the carb. I have ran
a gallon of fuel, taking plug readings after each
quart ran. The coil in the plug still looks great, perfect
color.