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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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