On Thu, 19 May 2005 09:07:42 -0400, Corky Scott
wrote:

There was a website devoted to the wear of Lycoming valve guides that
went into design and development of Lycoming engines, and also what
they think is the actual problem causing the premature wear in certain
models of Lycomings.

Here's the article I was referring to:
http://precisionengine.home.mindspring.com/engine1.htm

Corky Scott