I am getting ready to replace valve stem seals. I ordered the valve seals, but they are all the same size. After reading posts from others, all with different models than mine, are the exhaust and intake selas the same size on my 88 560SEL?

Couple other questions. Is it better to pull the cams when changing out the seals, or leave them in place and work around them? Taking the cams and gears out looks like it will create a problem turning the engine over to get to TDC for each piston. The timing chain willl be laying there loose. However, with the cams out makes the springs much more accessable. Any advice from some one who has done this on a V8?

Thanks