Do I need to add lead additive to my 1966 Impala?

I have heard I do and I have heard I don‘t. If so by running a tank of gas through it without additive would that of hurt anything?

This Site Might Help You. RE: Do I need to add lead additive to my 1966 Impala? I have heard I do and I have heard I don't. If so by running a tank of gas through it without additive would that of hurt anything?

High performance cars from the 60's and early 70's require high performance gasoline. Unless the engine has already been modified, pre-1971 cars require leaded high octane gasoline to run correctly. Because leaded gasoline is no longer sold in the United States, owners of these types of vehicles need to buy lead substitute additives (around $2-$5 per bottle). A bottle is generally good for one tank of gas. Lead is critical because it acts as a lubricant for the internal engine parts and stops them from wearing out prematurely. Engines built in 1971 and later are built to run on unleaded gas so adding lead substitute is not needed. In fact, lead damages Catalytic Converters, which are required on cars built after 1977, and is more harmful to the environment. Adding a lead additive to a pre-1971 engine will literally prevent the engine from beating itself to death