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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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