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Lead for valves train is an American car thing. Other than a MG I can not think of another countries car engines that were built as cheap and simple as the US. there is no post WW2 manufacture that I know of other than US that needed lead, other than some MG's.
If your car has a aluminum head you know it does not need lead.
The US auto makers for awhile, all of them, would just bore a hole in a cast iron head and call that a valve guide, it was a valve guide, but it was just a hole in the cast iron the valve ran in. The US manufactures would just cut the cast iron where the valve seated on the head and call that a valve seat, yup the valve seated there but it was just cast iron.
All aluminum head engine, VW, Porsche, Ferrari, Datsun, Toyota, Mazda, etc. all have hardened seats added and some sort of silcon bronze valve guide.
So that "Lead is need for classic cars" is untrue.
Lead is needed for American classic cars is true, if they have not been rebuilt properly.
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