Valve recession can occur on any engine and many of those old cars hold up well because the cast iron used back then had a high nickel content. Since the seats were part of the cast cylinder head the nickel allowed them to stand the abuse.
Valve recession can occur on any engine and many of those old cars hold up well because the cast iron used back then had a high nickel content. Since the seats were part of the cast cylinder head the nickel allowed them to stand the abuse.