What cummins diesel fits in 1977 Ford F-250?
A 1977 Ford F-250 didn't come from the factory with a Cummins diesel. Cummins engines weren't commonly swapped into those trucks until much later. While it *is* possible to swap in a Cummins, it's a significant undertaking requiring substantial modifications. There's no single "fits" answer because it depends on which Cummins engine you choose and the amount of custom fabrication you're willing to do. You'd need to research specific Cummins engine models and their dimensions to see which might be feasible to fit, and then consider the necessary modifications to the engine bay, transmission, mounts, drivetrain, and cooling system.