Factory adjustable cam sprocket??

[Luis Marques <marques@ti.com>]

I have been meaning to inquire the colective wisdom of the list on
this subject for some time, so here it goes.  The camshaft sprocket
on my car ('87 4kcsq) has about eight different holes for the woodrof
key to fit in.  I can only assume that each of those holes corresponds
to a slightly different cam timing.  I think they are markerd "0"-"7",
or "1"-"8".  I realize this is most likely not the stock sprocket, but
it is a genuine Audi/VW part.  Has anybody seen it before, or even heard
about it?  I would be interested in knowing how much timing advance (or
retard) corresponds to each of the different holes.  Any takers?

TIA 

Luis Marques