May not matter if its not used for heavy work. But as Pete said IH recommended a 17 degree impulse coupling rotating unit complete be installed in the magneto for FC pistons in a M. On a 400 and 450 IH recomended only using fire crater with a distributor. Also not to have total timing over 25 degrees at the crankshaft. They had a template in some sets to mark the crankshaft pulley if it didn't have the mark. Not sure if IH recommendations can be compared with now. But in the sixties when a lot of fire crater kits were being put in I think the gas octane was as good as todays. At least what Dad used on the farm, we used it in 10.5 to 1 compression engines with no problem.
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Today's Featured Article - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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