I paid $150 for clean pressure test and head resurface. I think they charge $600 for that and valve job. Make sure you pick a shop that is recommended by a mercedes nut. Not quite the same as a chebby small block.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42