8.9 liters and 543 cu in.. the truck is or was around 17k every day so this should motivate it pretty well. Having a real jake brake is going be nice. we set the timing at 15.5 so its real responsive also. that turbo is a 471 with a 1.10 ex housings and it seems to spool it instantly.. should be good for the hp goals we set.. the other part is this motor stock was 400 hp and 1250 ft/lbs so its going make some torque throught the 13sp.. hes already thinking that he's going to have to upgrade the dana 80 to a dana 130 lol..