balelorf

I wish I had the article handy, it was in a circle track magazine a couple of years ago. They ran Chevron 92 pump unleaded in a race motor and it ran really hot, boiling of the radiator, however they made about 550hp. They dumped in 110 octane race gas and ran about 20 degrees cooler but made about 530hp. Greatest illustration I ever saw on why you run race gas was that dyno chart and radiator temps, it's not for horsepower no matter what anyone thinks they feel.