* 351 cubic inch Windsor V8 (5.8L): This was a very popular choice.
* 400 cubic inch M-code V8 (6.6L): A larger displacement V8 providing more power.
* 460 cubic inch Big Block V8 (7.5L): This was the largest engine offered and was usually found in heavier-duty trucks.
There may have been other less common options available as well, depending on the specific trim level and ordering choices at the time. To know for sure which engine was in a *particular* 1978 F-250, you'd need to check the vehicle's documentation (like the original owner's manual or a vehicle history report), or inspect the engine itself for identifying markings.
