I can"t recall from memory what the cranking compression should be for 300/350, however 90 is pretty low and 140 seems reasonable. I have never experienced the cam gear jumping a tooth, but I have experienced the cam gear key failing and causing the cam to retard to the point the engine would not run. I had this happen in a 300U and a 450 three different times. Once it starts to go it drops compression and power, and will eventually quit running. I did the same as you, new rings pistons sleeves and bearings with no change, very disappointing. I finally had an old IH mechanic come and check it out when I gave up. He listened to it crank over two times then put his hand over the exhaust manifold and cranked it over until it sucked his hand tight. He then told me that the exhaust should always push, not suck, and to get a new cam, cam gear and key.
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Today's Featured Article - Tractor of the Month - by Staff. decals, dependin upon the configuration of the parent company International Harvester in the year of production. For the purpose of this article, we will refer to the tractor as simply a "Farmall Cub". This little tractor was aimed at the needs of the small-acreage farmer - farms of 40 crop acres or less and truck gardens, or for larger farms that needed an extra tractor. Seven or eight implements were initially designed for it: Plow, Disc, Backblade, Sickle-Bar
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