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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.



Where I drive around town is pretty close to sea level, or actual sea level when I drive to the beach. Where I race 1/8 mile is at 1700 feet.

I'll have a quench motor when I step up to some aluminum heads. Also going to change to a solid lifter cam but that's a different topic.