You can count the bolts that are on the head. The six-bolt head fits the K-91 with a bore and stroke of 2.375 X 2.000; displacement of 8.86. The K-161 has 7 bolts on the head with a bore and stroke of 2.938 X 2.500; displacement of 16.94. The K-181 also has 7 bolts with a bore and stroke of 2.938 X 2.750; displacement of 18.64. The K-241 has 9 bolts with a bore and stroke of 3.251 X 2.875; displacement of 23.85. The K-301 has 10 bolts with a bore and stroke of 3.375 X 3.250; displacement of 29.07. The K-321 has 10 bolts with a bore and stroke of 3.500 X 3.250; displacement of 31. Let me know if you need more info as I have the manual on these Kohlers.
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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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