switched from the autolite 3923's to the Champion truck plugs tonight. I noticed a bit of pinging with the autolites that wasn't there before I changed to them. A friend of mine tryed the truck plugs and had positive results. Going to check milage and post back. was getting about 13-14 on the high way w/ 3923's allways hoping for more[8D]Truck idles better with the Champs, can't really test any power gain due the whole town is an ice slick, guess i have to wait for spring to get after her.[sm=gears.gif]