M3 Motor Manuals

Are there any comprehensive motor manuals or rebuild manuals for the M50, M52, S50, S52, or S52TU motors. I would like to learn as much as possible about these motors. Searching online hasn't lead me anywhere. Basically any book about these motors is perfect. Thanks.

Unless your a BMW employe or have access to the BMW dealer webpage. Or have a chilitons/haynes manual (which is horrible compaired to the directions avaiable on the website) theres not many other ways to find complete teardown/rebuild for the Motorsport engines.