The reason you don't hear a lot about older engines having problems with unleaded gas is that most of them have had a lifetime treatment of lead. But once you grind the valve seats, you're back to bare iron.
Supposedly, if you run an engine on leaded fuel for ten hours or so, it will have all the lead it needs until overhaul. Of course the only leaded fuel available is 100LL avgas, and it will probably go away in a few years. But you might try running a couple of tanks of avgas through your engine after you re-do the valves. I'd say that's more likely to work than any snake oil "lead replacement" additive.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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