Quote Originally Posted by rspears View Post
For iron heads I'd stay below 9:1 with todays ethanol blends, and not more than 10.5:1 with aluminum and you'll still probably be chasing premium fuel. What fuel are you wanting to run?
Glenn, What I intended to type was "....not more than 9:1..." for iron heads, not "...below 9:1..." My apology.

Mike, thanks for your input and insight.