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Actually, the lead in leaded fuels wasn't to stop knocking..... the lead cushioned the valves and the valve seats, which wear out quickly when unleaded fuels are burned in engines that need leaded fuels... the older engines had softer steel valves and seats, nowdays engines have hardened steel valves and seats..... when you want to burn unleaded fuel in a older car you either add a fuel additive or pull the heads and have a machine shop install hardened steel valves and valve seats. Or say screw it and just drive it until you burn a valve....
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