 Thundering 353 hp @ 5400 rpm (312 hp @ 4400 rpm in 3500HD Big Dooley models) |
 Class-leading standard heavy-duty horsepower in 2500HD and 3500HD Single Rear-Wheel models(1) |
| 373 lb.-ft. of torque @ 4400 rpm |
| High-speed air movement deep inside the combustion chamber, which generates an ideal fuel-to-air mixture |
| Variable Valve Timing (VVT) technology that optimizes combustion, enhances low-end torque and high-end power, promotes efficiency, and helps lower emissions |
| A cast-iron crankshaft with undercut and rolled fillets |
| A thermoplastic composite intake manifold that helps keep the air intake cool, and equal-length runners that feature smooth interior passages to promote high-speed airflow to each cylinder |
| Electronic Throttle Control that provides outstanding throttle response, greater reliability and improved efficiency |
| Hydraulic engine mounts for improved vibration isolation |
| A faster, smarter Engine Control Module with more memory that better synchronizes the multitude of engine operations that occur every split second |
| A coil-near-plug ignition system for a precise delivery of high-energy spark |
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| 1 Based on 2008 GM Large Pickup segment and latest available competitive information. Excludes other GM vehicles. |
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