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I hear you on the poor gas quality... That is why my new 440 Mr Six Pack Attack build is going togehter at 9.5 to 1 compression using 906 heads.

Do you have the manifold exhaust heat crossover blocked? Also are you running a 160 thermostat? Cool is always better to fight knock...

Can you at least get Non-ethanol 91 octane? I believe it will work better. here in Canada, the SHELL 91 has no ethanol, but other 91's do!

Good luck with it.

Arnie

Yes I do run non ethanol 91. Heat crossover blocked yes. 180 t-stat and that wont change.

Mopar to the bone!!!