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.
As an Amazon Associate I earn from qualifying purchases.
| 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.
#1 Best Overall
- Never Let a Dead Battery Ruin Your Drive. The LISEN 4 in 1 Retractable Car Charger delivers reliable power for your entire journey. Compatible with standard 12V cigarette lighter sockets, it keeps phones, tablets, and devices charged during daily commutes, road trips, and long drives — the perfect practical gift for dads, truck drivers, and anyone who lives on the road.
- Daily Driver Essential: Always Ready When You Need It. Featuring two retractable cables ( USB C & Old iPhone Charging Cable ) that extend up to 31.5 inches and dual USB ports, this charger solves cable clutter while charging up to 4 devices simultaneously. Ideal for busy fathers, commuters, and families who want a tidy car and never worry about low battery again.
- Deliver full-speed PD fast charging for iPhone 18 Pro Max & iPhone 18 Pro Max & iPhone 18 Pro right inside your car. The built-in 45W PD USB-C port hits the peak charging speed for these latest iPhone models, juicing up your phone to 50% power in just 15 minutes while you drive.(Note: Maximum 45W PD output is available under 24V vehicle power supply. When used with standard 12V car sockets, the peak output is limited to 36W.)
- Standard 12V Power Solution: Designed as a dedicated USB power supply for charging devices. Note: Does NOT support CarPlay, Bluetooth, or data transfer. Compatible with most phones, tablets, and small electronics. This retractable charger is a core car organization tool, keeping your vehicle tidy. Not compatible with Micro-USB devices.
- Clutter-Free Tech Organization: Featuring dual USB ports and retractable cables, the LISEN 4 in 1 charger provides a clean car storage solution. Perfect for truck enthusiasts or as a thoughtful gift for drivers, it supports fast USB-C charging for devices like the iPhone 18Pro & iPhone 18 ProMax. Keep your vehicle organized while ensuring efficient power delivery for all your tech on the road.
“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.
Rank #2
- High Quality Material: The coaster is made of environmentally friendly silicone, safe, non-toxic and odorless. Soft with toughness, easily embedded in the cup holder. Very durable, wear-resistant, long service life. High temperature resistance, can withstand 100 ℃ high temperature water cups.
- Wide Compatibility: The coaster has a diameter of 3.15 inches and a height of 1.18 inches, which is widely used in most vehicles, such as SUV, sedan, MPV, etc., as long as the size fits your car cup holder.
- Protection Function: Our car cup holder coaster has a carry handle design and a stand-up ring edge on its edge to effectively prevent food crumbs, drinks and water from leaking out and preventing the car cup holder from getting dirty.Meanwhile,Thickened design effectively prevents the cup holder from being scratched by the cup when driving on bumpy roads and eliminates the annoying thumping sound, making your journey more enjoyable.
- Easy to Use and Clean: With embedded installation, you just need to put it flat on the car cupholder. It is also very quick to remove, there is a small bump on the coaster, pinch it and you can easily remove the coaster. It is very easy to clean, rinse with water or wipe with a wet towel (be careful not to clean with sharp tools).
- 100% Satisfaction: Our products have quality assurance, if you have questions or are not satisfied after receiving the product, don't worry, please contact us as soon as possible, we provide after-sales service.
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.
Free tools Windows power users keep installed
One-click scans. No signup required.
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.
Rank #3
- ✅【Designed for Magsafe】 - The most fashionable iphone car mount in 2026 Magsafe is designed for iPhone 18 Pro Max/17/16/15/14/13/12 Pro Max Mini and official Magsafe cases and other magnetic phone cases and can be fixed directly to these phones without the need to affix metal plates. All Android Phones Will Work: Metal rings are provided; they fit cases and other phones without magsafe. Based on Unique Grandmaster Design (Protected by US Design Patent No. US D1,112,194 S)
- ✅【STRONG MAGNETIC MagSafe Car Mount】 - This powerful magnetic phone holder can create a powerful attraction that firmly supports your device while allowing you to drive without distraction. it easily and securely holds your phone through bumps, sharp turns or even sudden stops, no worrying of dropping your phone.
- ✅【SUPER STICK FORCE】 - VHB Dash Mounted Holders adhesive provides strong stick force between the dashboard and the car phone holder, which can firmly stick to any plane in the car, fix your device, adapt to a variety of road conditions such as sudden braking, speed bump, and rugged mountain road.
- ✅【SAFE DRIVING VIEW】 - Mini-size, not taking up space, it is placed in the dashboard without blocking the view at all, and does not need to look down at the device to ensure your safe driving. Cell Phone Car Mount is suitable for most cars, pickups, SUV, taxi; It is the best assistant for Uber and Lyft drivers
- ✅【360° FREE ROTATION】 - With an adjustable swivel ball joint, you can rotate your smartphone or device at your own will, providing the best viewing angle. Quickly pick and place with one hand, free your hands and make calls and GPS navigation more convenient
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.
Quick Recap
Best Value
- 🔰 UPGRADED SIDE STORAGE DESIGN - Our console cover is thinner than the old one, universal for all seasons. There is an 8.66*5.12 inch storage pocket design on each left and right side, expanding the storage space, convenient and practical. Meet the storage needs of the main passenger seat, you can store your cell phone, keys, tissues, ID and some other small daily items.
- 🔰 PREMIUM MICROFIBER LEATHER MATERIAL - This car center console cover is made of quality microfiber leather material, soft and skin-friendly touch. Exquisite and fashionable diamond shaped stitching, every detail is in place. Inside the car center console cover is made of thickened memory foam, even after squeezing, it can slowly recover to its original shape.
- 🔰 RELIEVE DRIVING FATIGUE - The arm rest cover for car adopts ergonomic design, giving just the right amount of arm support, effectively dispersing elbow pressure and relieving driving fatigue. Protect your car's center console from getting dirty or scratched. Especially suitable for long time driving or long distance traveling, bringing you a new experience of relaxation and comfort!
- 🔰 NON-DESTRUCTIVE INSTALLATION - This car console cover is designed with an elastic band for a firm fit and not easy to shake. And the back side is full of protruding dots, which can effectively avoid the armrest cover from slipping and shifting. All you need to do is to open the center console cover, put the elastic band directly into the cover and then close it.
- 🔰 BUYER'S GUIDE - You will receive a car armrest storage box with the size of 12.13*7.80 inch, please measure the size of your car's armrest storage box before you buy. We have prepared five simple and beautiful colors for you, you can choose according to your own preferences. Suitable for most of the vehicles on the market, such as car, truck, SUV, RV, van, etc.
Rank #4
- Buyer's Guide: The seat guard for car seat between seat & console measures 15.75*2.7*1.53", suitable for gaps of 1.43-1.53" in width, please double-check carefully the distance between your seat and the center console before placing an order
- Storage and Filling in One: Differ from traditional single-function gap fillers, gap filler for car incorporates storage function, offers you the convenience of storing phones and various other items, so that you can access them at any time while driving
- Avoid Items Slipping: With the bumps and vibrations of the car, phones, keys may fall into the seat crevices, which is difficult to pick up, and distracts the driver's attention. Car gap seat filler fills gaps seamlessly to create an effective barrier
- Easy to Install: Car side seat gap filler is easy to install, simply insert it into the gap between the seat and the center console, gap seat filler for car can fit tightly without affecting the normal adjustment of the seat and the use of the seat belt
- Premium Material: Crafted from premium EVA material, our car seat side gap filler boasts a combination of wear-resistant, softness&durability. Maintenance is effortless, simply rinse and wipe to quickly clean the dust and debris in corners and crevices
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
