By on September 28, 2016

2017 chevrolet silverado 2500HD

General Motors quickly deleted the power figures for its new 6.6-liter Duramax turbodiesel V8 after they were posted to the GM Powertrain website, but we now have confirmation of the heavy-duty engine’s output.

TTAC’s Matthew Guy has just sent us the figures from the Texas Motor Speedway in Fort Worth, where GM is debuting its 2017 heavy duty pickups.

What are they? Exactly what GM sought to swipe from its website. 445 horsepower at 3,000 rpm and 910 lb-ft of torque at 1,600 rpm. The engine sports the same dimensions as before — a 103 mm bore and 99 mm stroke — but makes significant power gains, mainly through use of a new turbocharger.

The previous Duramax generation made 397 hp and 765 lb-ft. With the boost, GM slots itself between the Ford Super Duty and Ram 2500 in terms of maximum torque.

GM’s diesel-powered 2017 heavy duty pickups sport a hood scoop designed to provide 60 percent of the air reaching the engine. The supply of cooler air benefits overall power output, while boosting performance in hot weather and under heavy loads.

The 2017 Chevrolet Silverado HD and GMC Sierra HD go on sale in early 2017.

[Image: General Motors]

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46 Comments on “GM 6.6-liter Duramax Diesel V8 Power Figures Confirmed...”


  • avatar
    Testacles Megalos

    ….styled by Mr. Ugly.

    I think these looks must be intended to transmit SUPREME GROUND POUNDING POWER, EXISTENTIAL THREAT TO LESSER BEINGS LIKE PRUIS AND LEAF, GIGANTIC INDOMINATIBILITY 18WHEELERWANNABE. With just about the same gravitas and believability as the current Presidential Election.

    What has happened to pickemups? Especially the Murkin ones. The old C10, F100, early F150, and whatever International called theirs—righteous trucks. Now, its a race to the bottom of the aesthetics pond to produce a bloated Baroque look. Yow.

    • 0 avatar
      dal20402

      One of these days pickup styling will collapse in on itself, creating a black hole of macho filigree.

      Until then, I’ll just look at pictures of GMT400 trucks, which had their functional issues (rust, horrible interiors) but are still the prettiest pickups ever built.

      • 0 avatar
        86er

        Hell, I’ve seen GMT-900s with more rust than my ’96.

        Common over rear fenders. They’re not as bad as contemporary Dodges, but man.

      • 0 avatar
        CobraJet

        Thank you. I feel that way about my 94 Silverado that I still have since new. I’m in the south so no rust, and my interior has held up great. Still no squeaks and rattles. The dash isn’t even cracked, unlike my 09 Silverado. The styling of these GMT 400’s has aged very well.

    • 0 avatar
      davefromcalgary

      The 2016 Silverado refresh only looks even passably good in black. The front end is such a mess of cutlines.

  • avatar

    Im no expert but my high school arithmetic says that (functional?) ram-air hood scoop is easily 20 HP

  • avatar
    CoastieLenn

    Man… the torque numbers of the new HD trucks is insane!!

    Ram: Up to 900 lb/ft.
    GM: Up to 910 lb/ft.
    Ford: Up to 925 lb/ft.

    Are they trying to disrupt the Earth’s rotation with all that torque?

  • avatar
    James2

    Can’t find your ruler? Psst. Check inside Chevy design studio. I bet, if they could, they would make the tires square. Black is probably the best color for this monstrosity.

  • avatar
    redliner

    Yeah, but did you see those wheel arches? Square wheel arches look slightly “off” to my eye, but the real turn off is that the wheel arches reach up to nearly the same height as the hood and bed.

    Overall, it looks like a padded suit. There’s something artificial and insincere about the look.

  • avatar
    seabrjim

    It has gotten nuts, bragging rights and all. 765 lb. ft. isnt enough for a decent bass boat, right? For 2018 the Air Haulers will need an even 1000.

    • 0 avatar
      Sigivald

      Bass boat haulers buy a 1500 with the gas V8, mostly.

      You do realize that there are people who actually pull 20+’ RVs or horse trailers, right?

      Maybe you just never got on the freeway and thus never see them?

      Because I see them all the time.

  • avatar
    CoreyDL

    Oh my. That Silverado has seen some angry sass from the back of a Verano and is very unimpressed.

  • avatar
    PrincipalDan

    …from the Texas Motor Speedway in Fort Worth, where GM is debuting its 2017 heavy duty pickups.

    Why? So they can do lap times? So they can run a 500 mile race? So they can take turns practicing pulling support trailers for NASCAR Teams?

  • avatar
    suspekt

    Why do so many of you hate large pick ups so much?

    If I had the means, I think my car fleet would most certainly consist of:
    – German/Italian Sports Car
    – German Luxury Sedan
    – Big 3 Pickup

    These trucks (from light duty on up to HD Class) are as much about their capability as they are about how they make their owners feel.

    Luxury cars dont need 600hp and trucks don’t need 900lb torque.

    Personally, I think the big 3 truck designs are as intriguing as anything coming from any auto maker. They sell hundreds of thousands yet the style must remain fresh, appealing, and not copycat from one another.

  • avatar
    mikey

    I just went to the “build a chevy” site. I built an HD 2500 , diesel , reg cab, 8 ft box, painted wheels, rubber mats, and the heavy duty trailer package. I have virtually no use for such a vehicle, but I’d sure like to have one.

    • 0 avatar
      PrincipalDan

      And what did it cost?

      • 0 avatar
        28-Cars-Later

        *Dr Evil* One billion dollars!

      • 0 avatar
        mikey

        Just under 52 K…Canadian ,full list. I figure factoring in my GM retiree discount, then adding in all the taxes, dealer prep, destination charges etc ? i would probably be looking at 58 K , out the door.

        Yesterday, i priced Michelin winter tires, and OEM wheels {not steelies } ,for my Mustang. $2785.00 all in ,mounted and balanced..

        Or a 58K…truck ???

        • 0 avatar
          Scoutdude

          Around here there are take off Mustang wheels all over Craigslist in good shape for as low as $100 a set for base model aluminum wheels though most are $300-$400.

          • 0 avatar
            mikey

            The truck, is just” fantasy thinking ” on my part. The tires, on the other hand, are a must. The 3 season, original, Good Year eagles are truly frightening in 3 inches of snow.

            I’m going to explore the after market. I just have to check with Ford Canada to see if after market/used will be warranty compliant.

  • avatar
    doug-g

    GM needs to address the lighting issues on their vehicles. You rarely see a GM vehicle without a malfunctioning light and/or a burned-out light. I am speaking of NEWER vehicles.

    • 0 avatar
      indi500fan

      Interesting comment. I remember some guy asking GM truck major domo Tom Stephens (long since retired I assume) exactly that question in an employee newsletter 15 years ago.

      He blamed it on hyperactive alternators LOL.

  • avatar
    NoGoYo

    Why don’t they just make the engine bigger?

    427 Duramax…mmm…

  • avatar
    stuki

    The grille is not GMs’ long suit aesthetically. Viewed from the front, Rams look the best. In profile, GMs, and from the rear, Fords. At least to my eyes.

  • avatar
    thornmark

    How much does it weigh? These heavy diesels can greatly impact payload capacity.

    “Diesel engines are heavier than gas engines and significantly reduce the available payload of most truck configurations. It’s amazing how hard the choice of gas or diesel hits you in the pocketbook and payload, right where it counts.”
    http://www.truckcampermagazine.com/news/tcm-debuts-2013-chevy-silverado-3500/

    • 0 avatar
      Drzhivago138

      You’re correct, but those that buy diesels are looking not at the payload, but the tow rating. Whether it’s a gas or diesel, half-ton or HD, most modern pickups are used less for hauling (in the bed) and more for towing (a trailer). Yes, they still have insane payload ratings (3000+ on a properly-equipped F-150?!), but the tow ratings have seen an even larger increase in the past 20 years.

  • avatar
    philadlj

    More than RAM, but not as much as the Ford?

    I don’t think GM understands how the Torque Wars work.

    You’re supposed to UP THE ANTE.

    They didn’t, so they FAILED (say this in Wallace Shawn’s voice).

  • avatar
    True_Blue

    I feel like this was a missed opportunity for a cowl-induction hood. With a vacuum-operated flap.


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