Not sure all M103 heads are the same. The piston chambers on the early M103 engines were heart shaped (86-89), and the later style chambers are spherical (90-93). I would not intermix the two cylinder heads. But that's just me.

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1991 300E - 212K and rising fast...

The only thing I follow is to use late rocker arms with late cams, early with early and don't mix them. Also the threads holding the sprocket changed (you don't want to drill and tap the cam on the car when the only sprocket you have won't work).

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Hanno
'79 6.9 Sold (after 27 years)
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'94 E320 Sdn. 5 spd conversion
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'05 E500 Wagon

Correct. You cannot mix early rockers /w later cam and vice versa. It won't work. You must replace it all unfortunately.

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I would pay attention to length of bolts holding rocker assy to head. Seems early cars had shorter bolts . Can't remember if later cars had longer bolts or if you had to purchase from MB. Archives has info on this.

Rocker bolt length went from 70mm to 73mm. 75mm will work if you use a bottoming tap.
The oil tube was changed as high RPM operation starves cylinder 1 on early cars. Maybe it is an additional piece, and not a tube change.

M

Looks like I was not totally off base.

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I'm not a doctor, but I'll have a look.

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