Ford Authority

GM HD Lineup May Get 500+ HP Diesel Engine To Take On Power Stroke

In the world of heavy-duty trucks, horsepower and torque are kings. All three Detroit automakers are continuously one-upping each other in that regard, each becoming more and more capable with every passing model year, refresh, or redesign. As Ford Authority reported last week, General Motors was recently spotted benchmarking a Ford Super Duty F-350 equipped with FoMoCo’s 6.7L Power Stroke V8 diesel that produces 475 horsepower and 1,050 pound-feet of torque. Now, GM Authority is reporting that the 2023 GM HD lineup is aiming to trump those numbers.

The GM HD lineup – which consists of the Chevy Silverado HD Duramax and GMC Sierra HD Duramax – is rumored to be receiving some updates that will boost output to 505 horsepower and 1,085 pound-feet of torque, which would best Ford’s Power Stroke diesel by 30 horsepower and 35 pound-feet of torque, as well as the 2021 Ram HD 3500 equipped with the 6.7L Cummins turbo-diesel inline-six, which produces 420 horsepower and 1,075 pound-feet of torque, by a healthy margin.

2021 Heavy-Duty Pickup Powertrain Comparison
Vehicle Engine Fuel Type Aspiration Valvetrain Horsepower (hp @ rpm) Torque (lb-ft @ rpm)
2021 Chevy Silverado HD 6.6L L8T V8 Gasoline Atmospheric OHV 16-valve 401 @ 5,200 464 @ 4,000
2021 Chevy Silverado HD 6.6L Duramax L5P V8 Diesel Turbocharged OHV 32-valve 445 @ 2,800 910 @ 1,600
2021 Ford Super Duty 6.2L Boss V8 Gasoline Atmospheric SOHC 16-valve 385 @ 5,750 430 @ 3,800
2021 Ford Super Duty 7.3L Godzilla V8 Gasoline Atmospheric OHV 16-valve 430 @ 5,500 475 @ 4,000
2021 Ford Super Duty 6.7L Power Stroke Scorpion V8 Diesel Turbocharged DOHC 32-valve 475 @ 2,800 1,050 @ 1,600
2021 GMC Sierra HD 6.6L L8T V8 Gasoline Atmospheric OHV 16-valve 401 @ 5,200 464 @ 4,000
2021 GMC Sierra HD 6.6L Duramax L5P V8 Diesel Turbocharged OHV 32-valve 445 @ 2,800 910 @ 1,600
2021 Ram HD 6.4L HEMI V8 Gasoline Atmospheric OHV 16-valve 410 @ 5,600 429 @ 4,000
2021 Ram HD 6.7L Cummins I6 Diesel Turbocharged OHV 24-valve 370 @ 2,800 850 @ 1,700
2021 Ram HD 6.7L Cummins I6 HO Diesel Turbocharged OHV 24-valve 420 @ 2,800 1,075 @ 1,800

Currently, GM’s 6.6L V8 L5P turbodiesel Duramax is rated to produce 445 horsepower and 910 pound-feet of torque, so these rumored power figures represent a significant increase of 60 horsepower and 175 pound-feet over the current model. GM’s HD lineup is also available with the naturally aspirated 6.6L L8T gasoline engine, which produces 401 horsepower and 464 pound-feet of torque. Both of these engines are expected to receive updates for the 2023 model year as part of a mid-cycle refresh, but it’s possible the chip shortage pushes them back to the 2024 model year.

Meanwhile, as Ford Authority reported last week, the Ford Super Duty lineup is currently scheduled to receive a redesign in 2023 following the model’s refresh for the 2020 model year. In the meantime, the 2022 Super Duty comes equipped with a host of upgrades, including an available 12-inch center touch screen, SYNC 4, a new Lariat Sport Appearance Package, Black Appearance Package for XLT models, and new exterior and interior colors.

We’ll have more on everything the competition is up to soon, so be sure and subscribe to Ford Authority for the latest Ford F-Series newsFord Super Duty news, and 24/7 Ford news coverage.

Brett's lost track of all the Fords he's owned over the years and how much he's spent modifying them, but his current money pits include an S550 Mustang and 13th gen F-150.

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  1. crabbymilton

    How much do you really need? Seems that trucks once had engines in the 100-200hp range and if you had 250, that was a lot. If that’s what the market demands but at some point…

    1. Roy Chile’s

      Can Chevrolet do something about that Ugly frontend, I wouldn’t want to walk up to that every day

  2. Gary B kempf

    Their not reporting on a 12.8L. Now back on topic. The power stroke built by ford is hard to beat but I do agree how much do you need. With the big three its all about bragging rights. But I apologize ahead of time to my GM friends, that GMC needs someone else to design it.

  3. CGiron

    Out of question that the new leader among HD will use anything else than Compacted Graphite Iron ( CGI ) in the block of this superengine. The two others Ford and RAM are already using it since years and the only way the take the lead in the race for GM is to start using it. The new engines will be machined at the new Brookville plant. Good for Sintercast that´s providing the High Tech for the foundry

    1. Mickey\'s Daddy

      CGI is anything but necessary but it is nice for a strength/lb ratio.
      Rods, pistons, pins, and head bolts/head gasket are way more important than whether the block is made of regular old iron or CGI. The Duramax already has a nice deep skirt, 6-bolt per cylinder block. 500/1100 is not taxing the existing block, sorry. And I like CGI tech but you’re talking straight out of your rear

      1. CGiron

        We will see. Why so upset and rude?

        1. Mickey\'s Daddy

          I am neither, don’t project

  4. MontanaGriz

    Harley Earl has risen from the grave, and is he drunk.

  5. Nebula

    I need bit more from my powerstroke than now but that chevy is realy ugly.. please dont ever make that thing.

    1. Matt

      Bad news… they already make that thing

  6. jroosh

    Perhaps if they turn that frown upside down they will have something! (Or perhaps they will say “It has a nice personality”)

  7. sherry smith

    Sorry I have owned all three and by far the Duramax is the most dependable, best on fuel and never let me stranded, own two fords and ran good just not dependable and the dodge nickel and dimed me to death, Duramax may not be the strongest but like i said will not let me down.


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