Lead additive needed?

Looking for an opinion on this. I have a '52 TO30 that had a complete engine rebuild done in the mid 90's. Would it be safe to assume that the valves/seats would be hardened so unleaded gas could be used without having to use lead additive? I've been playing it safe and using the additive, but I'd rather not if modern rebuild typically addresses this.
 
The engine in my TO35 was rebuilt Back in the 70's.

My local co-op offered leaded gas one summer for older tractors, I bought a couple of 5 gal cans for the old tractor.

Just my experience: soon after the gas was used the motor appeared to have less power and was slower to rev up.

Finally it would not start, I took the head off and in for repair. It was seized up and almost had to be driven apart. Mechanic said I should not have used that leaded gas as the valves in my motor has been replaced with the new type valves made to run on Mon leaded gas.

I would not use that leaded gas in the tractor.
Jmtc<p
 
As maxwell99 stated you dont need lead or a additive in the TO 20,30,or 35 engines as they come from the factory with stellite ex valve seats. This was mighty forward thinking for a durable,long lasting engine back in the 1950's era.
 
The Standard engine in the TEA20 is also quite happy on unleaded fuel.

It is illegal and I would never do it .... :oops: .... but a few round lead fishing sinkers in the fuel tank serves a dual purpose - provide microscopic amounts of lead in the fuel and keep rust off the inside of the fuel tank. :eek:
 

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