04-01-2019, 04:32 PM
That engine has a design problem where the #6 cylinder drops a valve causing severe engine damage. This is a well known problem for the 650 HP ISX. The cure is a redesigned cylinder head to prevent. If I had to guess, this would be the cause for the rebuild.
Michael and Mona Corrigan
2008 Newell #1248
2010 Mini Cooper S