My plugs are too hot in in my 440. I'm using the motorhome 452 peanut plug heads with Champion RV9YC I need to go to a colder plug. After talking to Champion and Autolite they say the only way to get a colder is to go to the racing plugs V59YC. Autolite warned me that they will foul easily if the motor is idling alot but Champion didn't say anything about it. Is anybody using them in a street car ? do they work OK ? I'm starting to regret using these heads especialy when I had a set of 906's that I could have used.