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Initial timing advance is not very important, so long as the engine starts. It can e used to add or subtract a few degs in final tuning the engine. All street engines should be tuned for cruise, and the Flathead combustion chamber need allot of avance there 26/28 degs. but not very much for hard acceleration 18/20. now these numbers are for street application and depend on the modifications of the engine. With the development of the GM distributor we can now have an ignition system that works well in both cruise and acceleration, working hand and hand with a AF meter, excellent fuel mileage as well.