I'm going to look at a Continental O-200 engine tomorrow. The owner says it had new ECI cylinders installed a couple years ago, however, the pictures show Millennium valve covers. I know you can put any kind of valve cover you want on them. How can you tell the difference between ECI and Millennium cylinders? Also, I seem to recall some problems with ECI cylinders awhile back. How can I find out if these cylinders were part of the problems? Any info is greatly appreciated. Thank You.