Yes, definitely agree that the original purpose of the B series was to power a new generation of Ag/Construction equipment for the "new" Case Corp, being the next generation of Case/IH joint engineering of new Ag/Construction equipment that happened from the mid to late 80s.
Have a late model Case 2590 with the 504ci engine and firmly believe that the CDC 505 (C8. 3) was designed to replace this engine for the next gen tractor line keeping its characteristics in mind. Haven't really seen anything as to how the B series was derived, but I would think it was designed to target the mid-range tractor/construction line below the C series.
Love the B series, have two of them doing irrigation power work, they love to work 24/7 under extreme conditions. Have a C8. 3 and an N14, also doing irrigation work, excellent. My farmer has a couple of Steigers with N14s, taking many hours of abuse, great to see these motors in action. Local buddy who is a Cat Tech, doesn't mind doing Cummins rebuilds on the side, due to easy access to parts and ease of maintenance.
When my old Case 2590 gives it up, plan to replace it with a Case Magnum/CDC 505. 2590 motor still holding up, trans had to have a rebuild recently,
but hey same old story too much power for the trans, huh?!
Sorry, but I guess I revealed my Cummins prejudice, but hey its real world prejudice!
JD