Dan
Guest
I agree the N7 motor is one of Allis Chalmers best. I believe it would be a monumental task to set one in a 7580 thus a kit that has been developed to set in a Cummins may be your best bet. I think the N7 motors are finding their way into N6s thus you may find yourself paying premium just to get the engine unless you get lucky and find a cheap one. Best of luck to you.