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Old 09-21-2010, 09:09 PM   #20
38 coupe
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Join Date: May 2010
Location: South Texas
Posts: 1,624
Default Re: Flathead Gas Mileage

I have observed anywhere from 12 to 22 with stock flatheads. The earlier cars seem to get worse mileage. My 85 horse 37 gets about 15 at a steady 60, my father's overdrive equipped 50 got 21 at 70.

I think you should really look at your carburetor jet and power valve settings as well as your distributor advance curve. Make sure you are not running a stock 49-53 distributor with dual carbs.
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