Best I can tell the Autolite 386 was close to factory original heat range while 388 is a tad hotter, maybe better if compression is gettin low and she using a little oil or youre using it for light jobs or parades etc. A battery powered coil distributor ignition can tolerate resistor plugs better then a magneto where I prefer 3116 which I believe is a NON resistor plug. However the NON Resistor 3116 would also be okay regardless if distributor or mag so Id try 3116 or 388. A good tune up and good wires also helps regardless what brand plugs you run.
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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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