it is just new information that I havent' heard before. I worked with Ferrea on the valve issue that Russell's car and the Peacemaker had pretty extensively and the question on the seats did come up on my end. I was assured by them that in their testing, the seats were not the issue.
I am open to any other information you may have though. Any ideas on why there is such a spread of service life in the engines you are speaking of?