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 - The 9N Lives Again - by Tyler Neff. I often reminisce about the good old days of my youth when I visited my grandparents on their farm in Moorefield, West Virginia. I lived in Middletown, Maryland, which was about two and a half hrs away from the farm. During my summer vacations I would spend two weeks helping granddad Wilmer with his farming duties. Wilmer and his brother Weldon owned the �Neff� farm. Th
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