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GM’s new 8.3-liter Duramax makes more power overall, but Ford’s smaller 6.7-liter High-Output Power Stroke makes more horsepower per liter. Using the manufacturers’ rounded ratings, the figures work out to about 66.9 hp/L for GM and 74.6 hp/L for Ford. That comparison describes specific output—not durability, towing ability, fuel economy, or which truck is better. And despite the “understressed on purpose” framing, GM’s announcement does not establish its design intent or the engine’s durability margin.
How the Mongoose compares with Ford’s High-Output diesel
GM announced the new 8.3L Duramax for the refreshed 2027 Chevrolet Silverado HD and GMC Sierra HD, rating it at 555 hp and 1,230 lb-ft of torque. Ford’s 2027 materials rate the 6.7L High-Output Power Stroke at 500 hp and 1,200 lb-ft.
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| Published rating | GM 8.3L Duramax | Ford 6.7L High-Output Power Stroke |
|---|---|---|
| Displacement | 8.3 L | 6.7 L |
| Peak horsepower | 555 hp at 2,500 rpm | 500 hp at 2,600 rpm |
| Peak torque | 1,230 lb-ft at 1,400 rpm | 1,200 lb-ft at 1,600 rpm |
| Approximate horsepower per liter | 66.9 hp/L, calculated from rounded ratings | 74.6 hp/L, calculated from rounded ratings |
The calculation is peak horsepower divided by displacement: 555 ÷ 8.3 for GM and 500 ÷ 6.7 for Ford. These are derived figures, not statistics published by either automaker. Ford’s engine has the higher nominal horsepower per liter; GM’s announced engine has 55 hp and 30 lb-ft more peak output overall. The peak figures also occur at different engine speeds, so the ratios do not describe how either engine performs across its full operating range. GM’s 2027 Silverado HD announcement; Ford’s 2027 Super Duty specifications.
What GM has—and has not—said about the engine
“Mongoose” is a nickname
GM’s teaser calls the new engine “the Mongoose” while referring to a rival’s HD diesel as the “scorpion.” Treat Mongoose as a nickname, not an official displacement or model designation. GM’s newsroom describes the Duramax as “GM’s first clean-sheet HD diesel V8.” GM’s newsroom announcement; GM’s teaser.
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“Understressed” is not an established specification
The announced ratings show that GM chose a larger displacement to produce higher peak output than Ford’s High-Output engine, while yielding a lower calculated horsepower-per-liter figure. They do not reveal cylinder pressure, component loads, thermal limits, durability margin, or the reasoning behind GM’s design choices. The available announcement does not explain why GM selected 8.3 liters or establish that the engine is deliberately “understressed.”
Production and towing are separate claims
GM says the engine will be built at its expanded DMAX facility in Brookville, Ohio. The company also advertises up to 38,000 pounds of maximum available gooseneck towing for a properly equipped 2027 HD truck. That is a vehicle-level maximum dependent on configuration; it is not an engine-only rating. GM’s 2027 Silverado HD announcement.
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How the new Duramax compares with GM’s current 6.6L rating
GM’s official listing for the 6.6L L5P gives it 470 hp and 975 lb-ft. Compared with those published ratings, the announced 8.3L adds 85 hp and 255 lb-ft while increasing displacement by 1.7 liters. This is a comparison of stated ratings; it does not, on its own, establish which exact 6.6L configuration the new engine will replace across GM’s lineup. GM’s Silverado HD specifications.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why horsepower per liter is only one part of the comparison
Horsepower per liter helps compare peak specific output across engines of different sizes. It cannot, by itself, tell a buyer which diesel is the better choice. A fuller comparison would need evidence about the complete trucks and their configurations, including towing ratings, fuel economy, emissions, cost, and service or durability performance. The official materials cited here do not provide a like-for-like lifecycle, economy, or durability comparison.
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Version matters, too. Ford’s 2026 specifications list the standard 6.7L Power Stroke at 475 hp and 1,050 lb-ft, versus 500 hp and 1,200 lb-ft for the High-Output version. The comparison above uses Ford’s 2027 High-Output rating, not the standard engine or the previous model year’s figures. Ford’s Super Duty specifications.
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