Leaded gas

[Happy Times 57]

I have a 1977 American clipper I found a book in glove box that states in need to run my clipper on leaded gas only its a 360v8 do I need to redo the heads and change the valves, it running great now it has 35k on it. If there is anybody out there that knows whats up Please let me know thanks Tim

[bulldog 1995]

chances are that the heads have already been rebuilt. leaded gas hasn't been available at the pump since the late 80's.

if you run unleaded in a engine that is set up for leaded fuel, it's valves will start ticking. if you put lead substitute in a engine set up for unleaded it will smoke, lose power and eventually produce black smoke after the plugs foul