If you time by ear to the middle of of rpm increase and rpm decrease you will always be over advanced on a higher compression engine. Detonation under load. With the old fuel burning, low comp engine, no big deal. Most fire cratered IH engines actually sound late with no load when timed properly. IH made 8, 16, 22, 25, 30 and 40 degree advance distributors in left hand rotation and all take different spring sets and shafts, same weights.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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