Re: 1930 82b
Generally exhaust backfiring is caused by a lean mixture and retarded timing. First step is to just get everything set to factory specs. When I was in high school a classmate bragged that his friend's Model A would "pop 40 times going down a hill!". The trick to get those backfires was to throw the timing lever all the way up and close the GAV as you let off the gas at the top of the hill.
Remember, ethanol fuel has the effect of leaning the air/fuel ratio so you need to open the GAV some more to compensate if you're running that stuff.
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