The lubrication from the lead was only beneficial on the face of the exhaust valves and seats. That is why hard valve seats give better life than the softer material in the head. Far as valve guide lubrication, it comes from the engine oil coming down the guide, not the gasoline. Adding a bunch of stuff to gasoline will only add to the carbon buildup. IH sent out several service bulletins back in the day, recommending the use of unleaded gasoline to help overcome build up on valves AND the use of low ash oils. This was prior to IH introducing their own low ash oils. Problem was it was very difficult to find. Some oils designated for LP use were very low in ash at that time.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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