I am intrigued. How do you replace the guides with the head on? Since the valve must be removed for this operation, how is this possible? If you can perfect such a process, I expect that you could be wealthy.

Additionally, the original post indicates a very high mileage engine. I doubt that valve seals alone will do much unless the head has been off before.

Good luck,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles