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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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