Your spark advance on the mag is going to be right about 35 degrees before top dead center at all engine speeds and that C-153 is to run about 22 degrees before top dead center at full throttle with battery ign. The automatic advance in the battery ignition unit will, if operating correctly retard and advance the timing according to engine rpm. I would say 35 degrees advanced would cause severe detonation with engine working hard. You actually need to fine tune it on a dyno for max horsepower with least advance to be safe for heavy pulling but at least get a good battery ign unit made for the C-153.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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