How many miles? It is worth it to do the valve seals & guides if the head is off. They're gonna have to be done eventually, every M103 & M104 need a head job or leak oil around 150K+.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k