What is the difference in a 7.3 diesel engine and a 7.5 diesel engine?

Answer:
The only difference is the area (volume) the engine uses to make power. This volume is measured in Litres. A 7.3L engine uses 7.3 litres of volume in the clyinders to make the power it produces. So essentially, the size of the engine is the only difference, this would also effect horsepower as well.
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