As tuners have demonstrated by force-feeding plenty of boost, Ford’s 7.3-liter “Godzilla” V8 truck engine isn’t even remotely close to the limit of its potential in stock, naturally aspirated form.
Ford 7.3-Liter V-8 Available as a Crate Engine Supercharged Ford V-8 Makes 1450 HP Godzilla V-8 Makes 1000-Plus HP on Stock Internals Ford Authority, citing unnamed sources "familiar with the ...