Thanks for the information. It does sound like they built these to last with tungsten carbide seats. I would hate to have to have to regrind the angle on the seats. A person would need a diamond cutting tool to do it. Even sapphire stones and other materials aren't much harder than tungsten carbide. Also it sounds like the engineers did this to maintain clearance without having the valves gradually sinking into the head. My Dexta engines don't have insert seats so eventually the cast iron erodes so that insert seats have to be installed.
Since the stems on RBoots's valves weren't worn I guess it was more expedient to bore out the guides and press in off the shelf guides to restore proper stem clearance.
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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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