I do not know if it is supposed to be pressurized or not but with old cars I usually go the low or no pressure route. The way I figure it is if it is pressurized to say 15-16 lbs it is going to leak somewhere faster then if it is not pressurized. For example my 2002 GM 3.4 v6 suffers from the design flaw where the intake manifold gasket leaks even after being fixed under recall. With the coolant pressurized, coolant gets in the motor oil and toasts the bearings. Not pressurized I get a little oil in the coolant that floats to top of overflow. Clean it out occasionally. Been running like that since about 75K and its pushing 110K now.
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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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