Here are 6 pages of discussions of the old gas heavy duty truck motors. https://www.ford-trucks.com/forums/447226-534-vs-everyone-else.html
I think this is the model for the new (?) 7.3. Us old timers remember when diesel heavy duty trucks were the minority, my FIL hauled freight on the eastern seaboard with a gas tractor. My father bought the first diesel Ford 9000 (the gas job would be a 900) dump truck where we worked in about 1971. Do you guys remember when the truck islands had the same number of gas and diesel pumps?
In the oilfield the first frac pumpers were surplus Allison aircraft engines. They were followed by turbine (international solar) jet engines, because diesels were too heavy to produce 1,000 hydraulic horsepower on a standard tandem truck. A Dowell B902 (I think) pumper was my first piece of frac equipment, that turboshaft on a cold day would break the power end of the pump before it ran out of power. Later came the two stage inter and after cooled diesel piston engines.