I read somewhere that in 1989 MBz changed the camshaft profile for a smoother idling engine (M103), as the earlier cams were known to idle a little rougher than the new ones. That may be what the FSM is referring to in the mid-1989 production change that ps2cho mentioned. Does your response above mean that a 89+ cam (and rocker arms) can safely be used in a pre-89 M103 motor, or only that a 2.6 and a 3.0 use identical cams, provided they are of the same model year?

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't