Most kerosene-distillate tractors were in the 4 to 1 ratio range. Any higher, and they knocked like crazy if burning those fuels. The specific ratio may be available somewhere, although I don't think I've ever run across it. One thing that occurs to me is that, even if you don't come up with an exact ratio, a fairly-uniform pressure across the four cylinders would suggest that things are ok. One thing that was sometimes done to these tractors was to put in higher-compression pistons (which were available, I believe, as "high-altitude" pistons). This would have been done to allow using gasoline exclusively. There is always the possibility that this has been done at some time in the life of this tractor.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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