However, I can tell you that Ford F350 trucks from 1978 were available with a variety of engines, including:
* Gasoline:
* 351 cubic inch (5.8 liter) V8
* 400 cubic inch (6.6 liter) V8
* 460 cubic inch (7.5 liter) V8
* Diesel:
* 6.6 liter (400 cubic inch) V8
To know which engine a specific 1978 F350 has, you'd need to look at the VIN (Vehicle Identification Number) or check the engine compartment.