Quote: I'm running 9.5:1 compression with open-chambered iron heads with no quench and it is running fine on 91 octane pump gas with no pinging. I run it hard and race it on the 1/8 mile whenever I get a chance with no problems....
Have you tried 87 octane just to see how the engine responds?
It would be an interesting test , but I think he would have an issue without quench, unless he is at a higher altitude.
