At 08:48 AM 1/13/2009, David Beierl wrote...
>Is there really a physical difference, other than a groove around one
>side of the outer race?  I haven't been able to see any difference in
>the induction hardening or anything else, and the instructions that
>come with the Llobro joints don't have anything to say about it, nor
>does Bentley as far as I know.

Take a look here:
http://speedwagen.blogspot.com/2008/07/how-to-clock-vw-cv-joint.html
and also section 5.2 here:
http://www.ratwell.com/technical/FAQ/FAQContent.html