We started with an '05 GMC Sierra 4x4, extended-cab shortbed. This vintage of the Duramax received the designation LLY and was rated from the factory at 310 hp and 605 lb-ft of torque at the flywheel.
For the most part, we’re very stoked about the updated Heavy Duty Silverados that were unveiled at the Chicago auto show just last week. Interestingly, the power output of the 6.6L DURAMAX V8 ...
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