Be SURE to have a valve job done at this point. IF the head is off, it is easy to have the valves and seats prepped and the valves lapped. I don't think I would replace the guides unless they are worn.

Leaky valves are the #1 complaint on these engines.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS