I've recently read some post about fuel octane. Many stating that 93 octane is the min. for this motor. I personally have run 89 octane since the the day I brought it home (with no prolbems..ping exct. even with big three +cam), mostly because thats the highest I can get in my home town (Southern Illinois @ sea level). I do have access to 93 but its a 20 min drive. Anyway my thought is this.... would'nt you be better off running the LOWEST octane your engine could safely burn since the HIGHER octane fuel is actually harder to ingnite?? It seems to me that the only way to extract more power from higher octane fuel is to either add compression (I guess a cam could raise compression psi) or alter timing. Feel free to straighten me out...... comments are welcome.