ECI and MILLENNIUM CYLINDERs questions?

[supercub43]

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.

[Jeff Point]

New cylinders generally don’t come with valve covers so they probably got reused.

ECI has had a long history of cylinder problems. I don’t think the O-200 was subject to any of their ADs but they did have problems. That’s not necessarily a deal killer (depending on the deal) but should be factored into the price. New Continental jugs will set you back about a grand each.