Butch, there's no more protection for your valves in 93 octane than there is with 87... and an engine with a compression ratio as low as that 221 certainly doesn't need the octane. If your valves have no hard seats, then you can use a lead substitute additive (available at any auto parts store) to prevent valve seat recession. If you aren't really working the tractor hard, the damage would be so little as to be negligable. A study was done years ago when cars were weaned off leaded fuel and it was found that only high performance cars that were run hard and trucks that were worked hard was valve seat recession a major issue. As I recall, on the more easily worked rigs, it dropped about 10-15 percent off normal life off the valves. When worked hard, it could be from 40-60 percent. If yours is a parade tractor or an occasion field toy, it could take a long time for you to have any problems. Maybe beyond your lifetime. In any case, the protection-in-a-bottle is easily available and inexpensive.
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