Weights are same in all of those IH distributors , springs are different for different advance. Original H had 40 degree, super had 30 degree, any with fire crater power pack put in had 22 degree. Springs control the rate of advance, hole in shaft controls maximum advance, all are to be fully advanced by or some what before rated rpm. The code on dist mounting flange shows what advance that dist had originally. Could have been changed. Weak springs and worn weights cause too early advance at low speeds. You will get that exhaust flutter at low speeds and rough running. Excessive total advance caused detonation under load. You may not hear it but your pistons will know it.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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