Quote Originally Posted by C. Ludwig View Post
Best advice yet.


A hotter plug won't make power unless you're fouling plugs by running a cold one in the first place. The only thing a hotter plug is doing is holding more heat in the insulator to ward off fouling. Use the coldest plug you can while avoiding fouling issues. In some detonation prone race engines that requires warming the engine on a hot plug then replacing them with a cold plug for high load racing conditions. This has just not been my experience with an ITS engine. You're just not loading it highly enough to require a colder plug than stock to ward off pre-ignition or detonation.

So not even the 7s, just all with the 9s all around?