The "unleaded fuel ruins valves" story is something I call an "Old Mechanics' Tale"- - - - -sort of like an "Old Wives' Tale". The idea has been debunked decades ago. At any rate, the damage was supposedly to the valve seats, not the valves themselves. There's no telling how many dollars have been spent unnecessarily on hard valve seats and labor to install then, or how many engine that have been ruined by an improperly installed valve seat that comes adrift while an engine is running. If you're planning to run LP gas or compressed natural gas, go ahead and get Stellite seats installed (only on the exhausts), but for gasoline, leaded, unleaded, or alcohol-enhanced, it's not required. "Deathanol" is rough on carburetors- - - -not valves!
Jerry
