The '80 head has the pencil type, parrallel glow plugs in it from factory. I guess it is a late '80 or something.
I thinking the only differences are in:

-injectors.. turbo has bigger injectors
-prechambers.. are obviously different because of the injectors
-valves

Both heads are OM617. I just wanted to know if I was missing anything else.

Thanx..

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99 C230K Sport
87 300SDL
81 300SD