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If you are really worried about valve seat recession from the lack of lead in modern gasoline when used in a vintage engine, try using a tank of 100 octane low lead Avgas (100 LL) once a year or run a blend with regular gas for a couple of tankfuls. It has plenty enough lead in it to coat the valves and seats for a long time. The only problem is that this fuel is not legal for use in a motor vehicle other than aircraft so you will have to find a sympathetic airport willing to sell you the 100 LL in a gas can. The other positives of using 100 LL with old engines is that is is a powerful fuel system cleaner (if you smell Avgas it smells more like toluene solvent than gasoline) and it has an almost indefinite shelf life.
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