This high dollar stuff is pretty amusing for a flathead engine designed in 1939 to run on 70 octane WHITE GAS.
The flathead ford tractor engine used in the 2N, 9N, and 8N had hardened valve seats from the introduction in 1939.
Again, go down to the local gas station and fill a couple five gallon cans with the cheapest stuff they sell. The tractor can not tell the difference.
