If you mean 400 and 450 heads are you refering to LP heads. First LP 400 tractors used the same head casting as a gas. Then other 400 tractors used the head only used on 400 and 450 LP tractors. There was more than one head # used for some fuels, but they were a dirrect replacement for the other # for the same fuel. Have found the same # gasoline heads with matching date codes from 54 400 to 58 450 tractors. Most are # 362174.
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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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