[Vwdiesel] retorqueing

[rOLf peCHUkas]

hey all
I have run a couple hundred miles on my rebuilt head w/o retorquing
there was no heat-up/loosen/tighten spec on the slip that came with the 
head gasket (Erling)
and I couldn't find anything in Bentley
but am I doing something wrong?
am I supposed to loosen and re-torque my head bolts at some point?
(I dimly remember something about 1000 miles)
what's the collective wisdom here?
(this is a '93 Eurovan diesel Canadian n/a AAB-type engine)
(the torque sequence I followed - per Erling - was 30Nm /44Nm /90°/90°- 
I did that all cold w/ no heat-up/run-in or anything)
thanks
Rolf