Originally Posted by GGR

Not sure about the cam towers but I found the 3.5 rockers to be lighter than the 4.5 ones. I don't remember if there is a difference between the 4.5 ones and the 5.0/5/6 ones. I think they are all interchangeable.

Ideally you would need a special MB tool to compress the valve springs and be able to remove the rockers and then access the ball studs.

In prectice I was able to do the same by putting a small extension accross both valve springs behind the rockers and press them down using a longer extension placed perpendicularly under the camshaft and using it as a lever. You may have the small extension fly a few times but you will make it in the end.

Is that a 4.5 D-jet in the Pick n' pull? If yes and if the injectors are still there I would be interested in them, at least the ones where the blue plastic has not crumbled into pieces.