8.3L Duramax vs. Ford Power Stroke vs. Ram Cummins

Key Points:

• General Motors has introduced a new 8.3-liter Duramax diesel engine for the 2027 Chevrolet Silverado HD and GMC Sierra HD, producing 555 horsepower and 1,230 lb-ft of torque, surpassing Ford’s 6.7-liter Power Stroke and Ram’s 6.7-liter Cummins in horsepower and torque ratings.
• Compared to Ford’s high-output Power Stroke V8 (500 hp, 1,200 lb-ft), GM’s Duramax offers 11% more horsepower and 2.5% more torque, while it significantly outperforms Ram’s inline-six Cummins (430 hp, 1,075 lb-ft) by 29% in horsepower and 14% in torque.
• The new Duramax engine features increased displacement and advanced components like a compacted graphite iron block, forged crankshaft, steel pistons, and water-to-air charge cooling, paired with an Allison 10-speed automatic transmission and upgraded exhaust braking.
• Despite higher engine output, towing capacity depends on the entire truck setup, including payload, axle ratings, gear ratios, and braking systems; GM’s 2027 HD trucks are rated up to 20,000 pounds for conventional towing and 38,000 pounds with a gooseneck, but configurations vary.
• Key factors such as pricing, fuel efficiency, diesel exhaust fluid consumption, maintenance costs, and long-term reliability remain unknown, making it necessary to await real-world towing tests and ownership data before determining which diesel truck offers the best overall value.