Bern - 9/29/2020 19:03 My local machinist, someone who I trust greatly and who has been in the business many years, reports to me that Cummins is having some trouble with liners sinking on their post-2010 15L engines, at least from his vantage point. A lot of "blown head gasket" issues eventually lead to liner removal and block counterbore cutting to get the liner protrusion back up where it needs to be.