MototuneUSA has articles on this. His Break In Secrets Part 1 is probably the article you are thinking of.
The latest article Circular Logic - De-Mystifying Main & Rod Bearings (Break in Secrets Part 5) has a long explaination on how plain bearings work.
-Chris
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'80 911 Nogaro blue Phoenix!
'07 BMW 328i 245K miles!
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