After having some knocking in my engine, I revisited Pelotonracer2's thread on going one step colder with new spark plugs. In his thread he also talks about modifying the ground electrode so their is better combustion. Anywho, today I purchased 8 NGK LTR7IX-11 so I can find the plugs that index at 4 or 11 o'clock. There have been some people who think this is nonsense, but I can only find out by doing it because "SCIENCE!" We shall see...anyone who has done this, feel free to post results, even if you can't prove it. If anyone is interested in this information, google "Pelotonracer2 one step colder spark plugs" and it should lead you in the right direction. Cheers!