[tbone3312]

I just bought a 1964 and a half mustang and was wondering what kind of gas to use. It came with the original car manual which says that the car needs 93 or higher octane(premium). But i was wondering if i need a lead additive or if i could just run the car off unleaded gas

Thanks

P.S. It is an inline 6.

[pvtdiaz]

since they dont make leaded fuel anymore or best bet is to put premium unleaded gas the highest octane at the pump and if u have the stock original heads ur valve seats wont last they are meant for leaded fuel so you would need to upgrade to the newer seats

[Ivy66GT]

The octane scale was different in 1964 than the one on USA pumps today. A 93 octane in 1964 is 88 octane today - almost regular, mid-grade possibly. Premium should not be needed.

Not only is there no leaded gas, there are no lead additives that are street legal; the label will say, at best, 'lead substitute'. They do little for valves but are a mild octane booster. However, since you only need 88 octane you don't need any additives.