Quote: If you are saying you have a 11.5-1 motor. That is too hot of a plug. You should be in the 9 range. The rust spots are from detontation.
I have not had problems using Champion plugs in many applications. However, I have not been able to run that plug (too hot)in either of my two 10:1 CR big blocks.
I have not had problems using Champion plugs in many applications. However, I have not been able to run that plug (too hot)in either of my two 10:1 CR big blocks.