RE: What happens if I don't use a lead additive?(what if)

> I plan to  have the  head  rebuilt for  my 71 TR6. Should I have hardened
> seats put  in?

I certainly would.  Of course, it depends a bit on your pocketbook ... is
saving $50 now worth the chance you'll have to pull the engine down again in
a year or two ?

> would having them the  seats  cut or reground
> remove all effects
> of having used leaded gas.

Most likely, yes.

Randall