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6. Retro LSX secured the ideal donor motor for our swap—a low-mileage 6.0L LQ9 from an ’04 Cadillac Escalade. From the factory, these engines produced 345 hp at 5,200 rpm and 380 lb-ft at 4,000 rpm. With just a few mods, a 6.0L can easily make more than 400 hp and still average 20 mpg on the highway.