AMG info needed.

The cams are marked ' AMG 5.0-1 ' with mercedes ID 08/09 ( left and right respectively) .In a stock engine these are timed at 22 or 20 ATDC.(lining up the notches against crank TDC) I'm trying to find out if the AMG cams are set up at a different centerline.It has had off set keys fitted,but i've replaced the chain etc and can find no reason for the key off set.
Any info on these cams at all would be most helpful. Cheers!


