Brad put the Autolites in my R3 motor, and they work fantastic. I have used NGK plugs for over 50 years, but have now used Autolites in three other cars and am impressed with them. Also, counterfeit NGK's are flooding the market and it seems lately, many NGK plugs are almost impossible to source. If people want to use Champions, that is fine, but in the 1970s and 1980s, at all the USAC races, there was always a Champion "rep" giving away plugs to all the racers. We finally figured out whey he was giving them away, nobody would actually spend money to buy them!