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V8 Engine

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Ryan's H1 is powered by the factory 6.5L GM diesel V-8, and the power is transferred to the axles by the original GM 4L80-E four-speed transmission. The 6.5L V-8 is definitely not a go-fast horsepower monster since it only cranks out 205 hp. But the engine does produce 440 lb-ft of torque to push it where it needs to go, especially since the Hummer weighs more than 7,500 pounds.