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I am guessing with the 10.4:1 compression this might not be a bad idea.

You need more octane, if you build a monster you gotta feed it want it wants (needs). You're timing numbers ain't out of line but your SCR (& therefore DCR) is too high for your (current) choice of fuel.



I realize this number is high but I am running aluminum heads. I know people here have run much higher with pump fuel.

BTW I did take it out today with the colder plugs and took it up to WOT for a few seconds...enough to open the the secondaries and I didn't hear any pinging. I will keep testing and maybe try a heavier spring as well...