It would be a lead substitute because I don't think they can sell the old tetraethyl lead of "Ethyl" high-test gasoline.

Some have advised to just use the no-lead. If the valves burn, replace them with hardened valves and/or seats. My engine man said that only one of them - the valve or the seat - needs to be hardened.


1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.