Unleaded Gas

[Mulletwagon]

When leaded gas was banned cars at the time began to suffer valve/seat erosion. The fix for the classics at the time was rebuilding engines with stainless valves and hardened seats. Seems the problem of unleaded gas is no longer a problem with older vehicles - just wondering why. Is there now additives in gas that provides the lubrication that lead use to ? Can older engines up to the early 70s now be rebuilt with stock valves and seats ? Inquiring minds want to know.