I did a search and didn't find this, but maybe you guys should try autolite racing plugs. solid copper electrodes. I've had them in my sup for about 2000 miles now, and they seem to work great. I know they don't last long, but niether do regular autolites. You can get them from advance auto parts, part number is AR3923 . They have to order them, but if you keep your reciept, you can make them stand behind the 1 year warranty.