I can see some minute marks on the cam towards the cam bearing but I have a hard time recognizing these as original. They look more like tiny marks/scrapings made by earlier mechanics. Nor to they line up at all between the sylinder banks. There are no marks on the cam bearing whatsoever on my car that can line up to marks in the cam... There is no comparison on my car to fig.32 in the 400i WSM. That is why I am asking myself if there is a change between carb models and 400i in this area ?