Pete, what you post is correct and I have no issues with. IH co. indicated that leaded gasoline DID increase plug and valve deposits. Valve lash is important. Once again, Octane and timing play the role here. Another factor I forgot to mention on burnt valves, is running a tractor too lean on the carb mixture. I would have to do some research as to the octane ratings of "white gas".
Heads without Stellite seats would wear faster on the valve seat, and that coupled with valve stem wear would change the lift on the valves. There is more to valve lash and lift than just how much fuel gets into the combustion chamber. I also agree that modern gasoline doesn't give us much choice in octane ratings.
Previous poster indicated that valve jobs were the norm on high milage engines in the "old" days, and this was due to lead build up. Later, lead purging agents were added to the gas to burn off the lead deposits. These agents were also referred to as lead scavengers.
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