Find out if they did a compression check. The C7s are famous for eating piston rings (compression and oil rings) and head gaskets. A broken ring or a holed piston are the 2 leading causes of excessive crankcase pressure thus causing all the blow-by. I suspect that when the head gasket failed the coolant washed the oil on the cylinder wall(s) causing it to score and perhaps broke a ring. If it did, remember, the C7s do not have repairable engine sleeves already installed. They can be installed but often exceed the cost of simply finding another used C7 to swap.
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94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
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