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If you're talking about just up through GT models, the new 2011 5.0L V8 is the biggest. It produces 411 horsepower, the most powerful GT Mustang ever built. If you're talking about ALL Mustangs, the most powerful and big would be the 5.4L Supercharged V8 available in the Shelby GT500. It produces 445 horsepower. And it is SUPER FAST!!!!!!!

The biggest engine in size was the 1969-70 Boss 429 Semi-Hemi

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Q: What is the biggest Ford Mustang engine?
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