Best price I found after talking to several machine shops in Canada and the US for a 603 which includes cleaning, pressure testing, check for truness to see if it can be rebuilt $100. Assuming it just needs to be decked new guides and valves ground $550. Then I would need to source prechambers if necessary, seal rings and new collars, without a new prechamber roughly $200. I think the 606 after decking needs a high polish finish due to the MLS gasket? Throw in new coolant head gasket 12 more valves to work on with the 606 and it wouldnt take much to hit $1200. Jake how many w210's can you buy for that?

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92 e300d2.5t
01 e320
05 cdi
85 chev c10