It is possible but not very likely that you have enough oil pressure to blow the head gasket. While the psi could be very high, the passage is very small, i.e. there is not much force there.
Chances are that there is a defect in the head, the block, the gasket, or sorry to say, the installation, that is causing the gasket to fail.
The last major repair was the head gasket, so that is the first place to look. It won't hurt to have a look at the oil pump, check the pressure relief spring (they get tired usually), clean up the end plate, replace the gasket, etc., but it sounds like the head gasket failed twice in six months. Something is not right higher up in the motor.
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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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