Exactly. A is the smallest bore, tightest fit later letters are bigger. At the engine assembly station, IH used select fit and had different sleeves to use in each to assure correct fit. Almost all but custom sleeves (from a company like LA Sleeve)have a small range of real sizes near the mid point of the series. An hole labeled with an A will be very snug. Freeze the sleeves and heat the block to just able to touch it to assure getting it in W/O cracking the new Sleeve. Jim
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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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