Well maybe by todays standards they are not BUT for there day they were the latest and greatest . And they were designed around the fuel of the day. Now and old M may GET by with it playing around But if you put her back to work and i mean work you will find out what happens . IF it has been upgraded with higher compression pistons and a better high compression head plus just how many times has the head been milled down over the years and like you said timing that new low grade gas is going to burn way hotter and on the CAST PISTONS that they sell today the pistons can not get rid of the extra heat that the 87 and 89 octane makes and the pistons will start to swell and guild .Then ya get into the higher RPM 4 cylinder and 6 bangers and it get worse . . All this newer gas is for cars and light trucks that just move your donkey down the road . Ya ok you haul your toys behind pick ups they still are not working as hard as a tractor in the field pulling a plow or a disk .Just how many of you guys ever spent 10-12 hours on a gas tractor plowing and as the sun sets the glow of the manifold and the muffler is a cherry redand there is a half foot of flame standing out the pipe. .The higher cotane burns longer and cooler and makes all the difference .
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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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