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?
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
