Rich S. wrote:

"Peter Dohm" wrote in message
. ..

However, my real problem with the valve assertion is that I really don't
know anyone who managed to run one of these little air cooled engines long
enough and hard enough to burn a valve.


The 140 hp Corvair engines tend to lose valve seat inserts if overheated.

Rich S.


Same with VW.

Probably the same with any shrink in valve seats...

Richard