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Out of the box, the Mighty Demon was sporting 76 primary and 83 secondary jets with a 6.5 power valve. We set the timing at 38 degrees running and were pulling almost 13 inches of vacuum at idle. John McKindley stressed the importance of adequate vacuum at idle: "Anything above 10 or 11 is perfect." From there, we were set to make our first pull using 91-octane.