What's the difference between Ford's 6.8 and 7.3 Godzilla V8 engines?

Ford's "Godzilla" V8 engines are some of the strongest gas-powered blocks in its lineup. How do the 6.8 and 7.3 versions ...
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The Biggest American Engines From The Last 25 Years

Below, we're counting our way through a combined 72.5 liters of displacement as we list the 10 biggest American engines of the 21st century. These are the biggest production engines built by American ...