I have just helped a friend get his 1935 International Truck on the road and
he asked a really good question. Can he run unleaded gas in the stock blue
diamond flathead six? I thought he could because in the old days premium
gas was called ethyl because they added tetra-ethyl-lead, therefore the
lower octanes (like you would run in a farm truck) would be low or no lead
gas. I know they now add hardened valve seats, but this is just an old
flathead with a loose old valve train and probably limp springs and low
compression because of the design itself. There is probably enough lead
deposited on the valve face to last a long time. What do y'all think?
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