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We had just crossed 2200HP at 146psi when the 6.7L Cummins block simply couldn't handle the pressure and separated! We have done over 3000HP on this longblock setup so we feel like it was definitely a premature failure, but we see no signs of a problem in the datalog, pistons or rods before the block split. It looks as though the failure was simply stress fatigue to the OEM Cummins Block. The Longblock had been Modified by D&J Precision Machine with a Deckplate, 1" longer rods, ductile Iron Sleeves and 9/16" head studs, main studs and custom girdle, all which held up to the abuse had the block not failed. D&J has a new billet block in production stages that will hopefully prove to increase block strength significantly.
Audio at 2:04, for anyone who wants to hear what turbos sound like at 146psi.