duramax water in oil

I have a 2002 lb7 single cab short bed converted truck, new headgaskets, injectors, arp head studs. Ran fine for 3k miles and dumped coolant in oil. Changed water pump, fired it up and 30min later it was milked again. Any ideas?

After reading many posts I believe that I been making oil with coolant. Here is my scenario. 1. Rough idle 2. Lots of oil under truck (seems to be overflow tube) 3. Recently noticed exhaust started smelling "rich" i.e much stronger than normal. (could be burning oil off motor) 4. Have...