Red58, I understand the usage. But don't tell me valve recession is a myth. I examined many durability engines and field engines. There are many contributors to the problem; for example, valve rotators. So engine design plays a big part.
Steve H., iron heads went to induction hardened seats instead of inserts. It was not the valve material.
So how many miles were on that land speed engine? It is irrelevant to the discussion.
