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Since its release in the Ford Super Duty in 2019, the 7.3-liter naturally aspirated "Godzilla" V-8 has become a hit among tuners. Its massive displacement, modularity, and straightforward push-rod design means it's easy to tack on mods and make big power. As this video shows, you don't even have to swap out hard-to-access internals to make over 1000 horsepower.Australia-based HarropTV on YouTube wanted to see just how far its 7.3-liter Godzilla motor would go on stock internals, so it stuck on a few bolt-on mods to up the power before putting the V-8 into a car. For the first test, the team kept everything stock save for a bigger throttle body from a Mustang Shelby GT350, allowing it to make 550 horsepower on an engine dyno—up 120 horses from stock.From there, HarropTV added a Harrop TVS2650 supercharger and converted the fuel system to run on E85. With the GT350 throttle body still in place, the engine is able to put out just over 800 horsepower. Eventually, HarropTV swaps the throttle body out for a bigger 102-mm piece (versus the 87-mm GT350 unit) and ups the boost to 20 psi. The team is able to squeeze out a best run of 1015 horsepower and 988 lb-ft of torque. Pretty wild considering everything inside the engine—cams, ports, valves, etc.—is still totally stock.We've seen Godzilla motors deliver well above 1000 horsepower before, but not running stock internals. We're curious to see just how far HarropTV will push its 7.3. If it's already making this kind of power, we'd love to see what it would do with some upgraded hardware inside.