[427sharpe]

Having read thru this thread, I just have one question. Has anyone actually asked what benefit they think they see in 'race ' gas?? At many of the SAAC conventions, race gas suppliers had made a small fortune selling their wares to those of us who campaign our Shelby's (as I do with my GT350). As a test, SAAC gathered 12 seriously campaigned cars and let everyone run with 93 pump and the 110 race. Cars were run in 10 lap tests, with tuning sessions between heats. Cars ran 'blind' to the DRIVERS--ie, they didn't know what the car was using, they just gave driving impressions after each 10 lap sessions. After 5 sessions, lap times were tallied, and heats were examined. End result, NO DIFFERENCE. In the end analysis, they found that a properly tuned car on 93 Octane pump gas ran just as fast as a properly tuned car on 110. I really don't see problem with an 11.5:1 sideoiler running 93. Many of the SB GT350's are running much higher compression, and still use 93. Rick Kopec runs his R Model very hard at SVRA and SAAC runs, and runs pump gas. My BB runs 11.5:1 on 93 octane (but the 429 series can run more squeeze than the 427's without detonation). I would suggest that if detonation is a problem, you retune the motor, or as a last resort run water injection (Edelbrock) to cure it. In either of these scenarios, you can save the motor and your wallet.