Nobody said that valve seat recession wasn’t a problem.
What we said was that the cause of the problem was not the absence of lead.
What we said was that the cause of the problem was heavy detonation and high CHT that resulted from putting lower octane fuel in engines designed for higher octane fuel.
You should spend 30 seconds actually reading what we said.
Last edited by Lead Balloon; 8th Oct 2018 at 19:57.