2027 Silverado HD 6-6L Gas V8

Knudtsen Chevrolet› Blog› 8.3L Duramax vs 6.6L Gas: Which 2027 Silverado HD Engine Fits You Choose the 8.3L Duramax if you pull a fifth-wheel or gooseneck heavier than about 19,000 pounds, or tow long distances often; choose the 6.6L gas V8 if most of your weight rides in the bed, behind a plow or on a lighter bumper-pull trailer. The diesel costs $11,400 more on any 2027 Silverado 2500 HD. This guide walks through the numbers and the real-world jobs we hear about from truck buyers at Knudtsen Chevrolet in Post Falls. For background on each engine, read our 8.3L Duramax breakdown and our look at the updated 6.6L gas V8. The Silverado HD overview covers the rest of the truck. $11,400 Diesel option, any 2500 HD trim 20,000 lbs Diesel max conventional towing 19,000 lbs Gas max towing 6,990 lbs Gas max payload rating New Inventory Pre-owned Inventory New Vehicle Specials Contact Us Diesel or gas: what's the quick answer? Let the trailer decide. If it hitches in the bed and weighs more than the gas truck's 19,000-pound maximum, you need the diesel. Below that, the gas V8 is a legitimate choice and often the better value. Lean diesel if you... Pull a large fifth-wheel camper or a gooseneck stock or equipment trailer, put long highway miles on with a load, want the most torque for mountain grades, or need a dually rated for 30,000 pounds or more. Lean gas if you... Run a plow, carry heavy loads in the bed, tow a bumper-pull trailer a few weekends a year, or want the lowest purchase price on the trim you like. How do diesel and gas towing ratings compare? The gas V8's overall maximum of 19,000 pounds sits just 1,000 pounds under the diesel's conventional-hitch maximum of 20,000. The diesel pulls away with a gooseneck, where GM rates it up to 38,000 pounds. Rating 8.3L Duramax 6.6L gas V8 Max towing, any hitch 38,000 lbs (gooseneck) 19,000 lbs Max towing, conventional hitch 20,000 lbs Not published separately Max GCWR 46,500 lbs (select configs) Not yet released Dual-rear-wheel trucks 30,000+ lbs, every diesel dually Not yet released That's why we don't compare 38,000 to 19,000 as if they were the same kind of rating. Most buyers towing a bumper-pull trailer under 19,000 pounds are choosing between two engines that can both do the job, and the question becomes how the truck feels doing it and what it costs. Towing ratings for each 2500 HD and 3500 HD cab, bed, axle and drivetrain combination are not yet released. Every number above is a maximum for a properly equipped truck. Which engine has the higher maximum payload rating? Chevrolet's top payload rating is 6,990 pounds with the gas V8 and 6,170 pounds with the diesel, an 820-pound spread between the best configurations of each. That gap only tells you where the ceiling sits. Two specific trucks can land anywhere relative to each other depending on cab, bed and drivetrain, so the label on the door jamb is the number that counts. Still, if you load gravel, pallets or a slide-in camper more often than you hitch up, start your search with gas and let the label confirm it. Is the diesel worth $11,400? It is if you need the gooseneck rating or tow heavy on a regular schedule. For a WT, $11,400 is about 23% of the $49,995 starting price, which is a lot of money for capability you may use twice a year. The premium is flat across all six 2500 HD trims, from WT to High Country. If you'd rather spend that money on a nicer cab, compare the trims on our 2027 Silverado HD trim levels page before you settle on an engine. Fuel economy for both engines and the warranty terms for the 8.3L Duramax are not yet released, so a full cost-of-ownership comparison isn't possible yet. We'll add it when GM publishes the figures. Which engine fits common North Idaho jobs? Here's how we'd match each engine to common jobs we hear about, based on the published ratings. Job Our pick Why Big fifth-wheel camper over Fourth of July Pass 8.3L Duramax Highest towing ratings, 1,230 lb-ft for the climb, upgraded exhaust braking for the descent Gooseneck horse or stock trailer 8.3L Duramax Up to 38,000 lbs gooseneck on properly equipped trucks Equipment trailer, bumper-pull, under 19,000 lbs Either Gas max of 19,000 lbs vs diesel conventional max of 20,000 lbs Snow plow truck 6.6L gas Lower purchase price; confirm front axle rating with us Contractor hauling in the bed 6.6L gas Higher maximum payload rating Occasional boat or travel trailer 6.6L gas Plenty of capability without the $11,400 option Does the engine change anything else about the truck? Less than you'd think. Both engines run through an Allison 10-speed automatic, and GM's new electric power steering and eBoost brakes with 14.6-inch front rotors are part of the 2027 HD lineup regardless of what's under the hood. GM lists the trailering camera system, with up to 14 views including Transparent Trailer View, and trailer tire pressure and temperature monitoring as available on the 2027 HD without tying them to one engine. Gas trucks get a standard oil-level readout on the driver display. Diesels get GM's upgraded exhaust braking, which is the one feature here you'll appreciate most on I-90 heading down Lookout Pass with a full trailer. Get help choosing at Knudtsen Chevrolet Bring your trailer's weight and hitch type and we'll match you to the right engine and configuration. Shop new 2027 Silverado 2500 HD inventory or contact our Post Falls truck team with your numbers. Frequently Asked Questions Should I get the diesel or gas 2027 Silverado HD? Get the 8.3L Duramax for heavy fifth-wheel or gooseneck towing and frequent long tows. Get the 6.6L gas V8 for bed loads, plow duty or bumper-pull trailers under 19,000 pounds. How much more does the diesel Silverado HD cost? The 8.3L Duramax is an $11,400 option on every 2027 Silverado 2500 HD trim. A diesel WT comes to $61,395 including destination. Can the gas Silverado HD tow a fifth-wheel? It can tow up to 19,000 pounds when properly equipped. Heavier fifth-wheels and goosenecks call for the diesel, which GM rates up to 38,000 pounds with a gooseneck. Which Silverado HD engine has more payload? The gas V8 has the higher maximum payload rating, 6,990 pounds versus 6,170 pounds for the diesel. Payload for a specific truck depends on its configuration. Do the diesel and gas Silverado HD use the same transmission? Yes. Both are paired with an Allison 10-speed automatic.

Knudtsen Chevrolet› Blog› The 8.3L Duramax Explained: 555 HP and 1,230 LB-FT The 8.3L Duramax is a brand-new turbo-diesel V8 for the 2027 Silverado HD, and it makes 555 horsepower and 1,230 lb-ft of torque. That's 85 horsepower and 255 lb-ft more than the 6.6L Duramax it replaces, and it lifts maximum gooseneck towing to 38,000 pounds. Below is what's inside it, where it's built, what it costs and what GM hasn't published yet, written for diesel buyers shopping with Knudtsen Chevrolet in Post Falls. If you missed last week's roundup, everything that changed on the 2027 Silverado HD covers the steering, brakes and pricing. The 2027 Silverado HD overview page has the full model picture. 555 hp 8.3L Duramax horsepower 1,230 lb-ft 8.3L Duramax torque 38,000 lbs Max gooseneck towing $11,400 Diesel option on every 2500 HD trim New Inventory Pre-owned Inventory New Vehicle Specials Contact Us How much more power does the 8.3L make than the old 6.6L Duramax? About 18% more horsepower and 26% more torque. GM rates the 8.3L's 555 horsepower and 1,230 lb-ft as best-in-class for a diesel, using SAE testing. 2026 6.6L Duramax 2027 8.3L Duramax Change Horsepower 470 555 +85 Torque (lb-ft) 975 1,230 +255 Max towing (lbs) 36,000 38,000 +2,000 A note on that best-in-class claim: GM's footnote leaves out other GM vehicles. The GMC Sierra HD uses the same 8.3L engine. What's inside the 8.3L Duramax? A compacted graphite iron block, a fully forged crankshaft and connecting rods, and steel pistons. GM describes it as its first clean-sheet heavy-duty V8 designed, developed and manufactured in-house: a new design, not an update of the 6.6L. Bottom end The block is compacted graphite iron. The crankshaft and connecting rods are fully forged, and the pistons are steel. That's a heavy-duty parts list from the ground up, which is what you want in an engine that may spend whole days pulling a trailer. Air and fuel A variable-geometry turbocharger feeds the engine, with dual-stage air-to-water charge cooling and a high-flow fuel injection system. GM also upgraded the engine's cooling system. Noise and vibration GM added isolation hardware at the crankshaft to cut down on noise and vibration in the cab. We'll tell you how it sounds once we've driven one. Exhaust and braking The aftertreatment layout is new, designed to support regeneration during long tows. The exhaust brake is upgraded too, which matters on any long downhill with weight behind you. What transmission comes with the 8.3L? The Allison 10-speed automatic, GM's 10L1000, with what GM calls advanced shift logic. In Tow/Haul mode, GM tunes the engine, shift points, exhaust brake, grade braking, steering and brake boost together for the load. Picture an RV on I-90 heading east over Fourth of July Pass: Tow/Haul handles shifting on the climb, and on the way down the exhaust brake and grade braking take load off the service brakes. Where is the 8.3L Duramax built? At GM's DMAX plant in Brookville, Ohio. GM put $920 million into expanding the plant for this engine, and the facility now covers 1.4 million square feet. Why should a buyer care? An engine designed in-house and built on a line set up for it shows how seriously GM is taking it. GM says more than 60% of its heavy-duty buyers choose diesel. How much can an 8.3L Duramax Silverado HD tow? Up to 38,000 pounds with a gooseneck and up to 20,000 pounds with a conventional hitch, on properly equipped trucks. GM also lists gross combined weight up to 46,500 pounds on select configurations. Every diesel dual-rear-wheel truck is rated for 30,000 pounds or more, according to GM. If you pull a big fifth-wheel camper or a loaded gooseneck horse or equipment trailer around North Idaho, a diesel dually is the place to start, and the label on the specific truck has the final word. Towing and payload ratings for each 2500 HD and 3500 HD configuration are not yet released. Maximum diesel payload is listed at 6,170 pounds; the rating on a given truck depends on cab, bed, drivetrain and equipment. How much does the 8.3L Duramax cost? $11,400 on any 2027 Silverado 2500 HD, per announced pricing. That makes a diesel WT $61,395 and a diesel High Country $89,595, both including the $2,795 destination charge. The option is available on all six 2500 HD trims, from the WT up. To see what the rest of the money buys at each step, check the 2027 Silverado HD trim levels and prices. Not yet released for the 8.3L: fuel economy, the recommended oil specification, warranty terms and 3500 HD pricing. What we do know about upkeep: Chevrolet's covered first maintenance visit within 12 months includes oil and filter, a tire rotation, a multi-point inspection and, on diesels, up to four gallons of DEF. Our Knudtsen service department can book it. Reserve a look at the 8.3L Duramax GM expects the first 2027 Silverado HD trucks at dealers beginning late 2026. Follow our new 2027 Silverado 2500 HD inventory, or tell our Post Falls team the trim and trailer you're planning around and we'll reach out when a matching diesel lands. Frequently Asked Questions Is the 8.3L Duramax a new engine or a bored-out 6.6L? It's new. GM calls it its first clean-sheet heavy-duty V8 designed, developed and manufactured in-house, with its own compacted graphite iron block and forged internals. What transmission does the 8.3L Duramax use? An Allison 10-speed automatic, GM's 10L1000, with what GM calls advanced shift logic. Is the 8.3L Duramax available on the Silverado HD WT? Yes. Announced pricing lists the 8.3L as an $11,400 option on every 2027 Silverado 2500 HD trim, including the WT. What fuel economy does the 8.3L Duramax get? GM hasn't published fuel economy for the 8.3L, and heavy-duty pickups don't carry EPA mileage ratings. Where is the 8.3L Duramax made? GM builds it at its DMAX plant in Brookville, Ohio, which it expanded with a $920 million investment for this engine.

Editor notes (do not publish) URL slug: /blog/2027-silverado-hd-what-changed Publish date: 2026-11-12 (update datePublished in the schema if it goes live on another day) CMS post title (this is the post's H1; the body has no H1 to avoid a double H1): 2027 Silverado HD: Everything That Changed Meta title: 2027 Silverado HD: Everything That Changed Meta description: New 8.3L Duramax, stronger gas V8, electric steering, eBoost brakes and new prices: what changed on the 2027 Silverado HD, from Knudtsen in Post Falls. Last verified: November 3, 2026. Re-check prices on chevrolet.com before publishing. Update when released: Add 3500 HD pricing, per-configuration towing and payload, cab/bed configurations, 8.3L warranty terms, Trail Boss package pricing and LT/LTZ Trail Boss availability, and confirm 2500 HD MSRP once Chevrolet.com posts it. Images to download, rename and upload to /static/dealer-28512/SEO/: /static/dealer-28512/SEO/2027-Chevrolet-Silverado-HD-Hero.png from https://www.chevrolet.com/content/dam/chevrolet/na/us/english/index/trucks/2027-silverado-hd/page-assets/mh/27-silverado-hd-mh-xs-01.png ; /static/dealer-28512/SEO/2027-Chevrolet-Silverado-HD-Capability.png from https://www.chevrolet.com/content/dam/chevrolet/na/us/english/index/trucks/2027-silverado-hd/page-assets/capability/27-silverado-hd-capability-xs-01-v021.png ; Confirm image usage rights. Sources: https://news.gm.com/home.detail.html/Pages/news/us/en/2026/sep/0924-heavy-duty-duramax-83l-turbo-diesel-v8-engine.html ; https://www.chevrolet.com/upcoming-vehicles/2027-silverado-hd ; https://www.chevrolet.com/trucks/silverado/2500hd-3500hd ; https://www.edmunds.com/car-news/2027-chevy-silverado-gmc-sierra-heavy-duty-duramax-diesel.html ; https://www.autoblog.com/news/2027-chevy-silverado-hd-prices-rise-across-the-lineup ; https://tfltruck.com/2026/10/news-2027-chevy-silverado-hd-we-have-official-8-3l-duramax-diesel-pricing-its-better-than-we-thought/ ; https://carbuzz.com/2027-chevrolet-silverado-2500-hd-pricing/ Knudtsen Chevrolet› Blog› 2027 Silverado HD: Everything That Changed The 2027 Silverado HD looks almost the same as the truck it replaces, but the engine choices, the steering and the brakes are all new. There's an 8.3L Duramax diesel, a stronger 6.6L gas V8, electric power steering and an electronic brake booster, and 2500 HD prices went up $1,000 to $1,500 depending on trim. Here's what's different, what isn't, and what Chevrolet still hasn't told us, from the heavy-duty team at Knudtsen Chevrolet in Post Falls. Want the full model rundown first? Our 2027 Chevrolet Silverado HD overview covers the whole lineup, and the Silverado HD trim levels guide lays out all six trims side by side. 555 hp New 8.3L Duramax diesel 412 hp Updated 6.6L gas V8 38,000 lbs Max towing (gooseneck, diesel) $1,000 to $1,500 2500 HD price increase by trim New Inventory Pre-owned Inventory New Vehicle Specials Contact Us Does the 2027 Silverado HD look different? Not much. Chevrolet itself says the outside may look familiar, and Edmunds reports the sheetmetal and the interior both carry over from the current truck. That's a deliberate choice. GM spent its money on the hardware that pulls, steers and stops, which is where an HD owner feels the difference with a heavy trailer hooked up. If you're trading in a recent Silverado HD, the cab will feel like home. Chevrolet lists a 13.4-inch touchscreen, a 12.3-inch driver display, available Google built-in with the Gemini assistant, and eight years of standard OnStar Basics. What replaced the 6.6L Duramax diesel? An 8.3L Duramax turbo-diesel V8 making 555 horsepower and 1,230 lb-ft of torque replaces the 6.6L Duramax, which made 470 horsepower and 975 lb-ft in the 2026 truck. That's 85 more horsepower and 255 more lb-ft. GM calls it its first clean-sheet heavy-duty V8 designed, developed and manufactured in-house, and rates its horsepower and torque best-in-class among diesels (GM's claim excludes other GM vehicles, since the GMC Sierra HD gets the same engine). It's built at GM's DMAX plant in Brookville, Ohio, and it's paired with an Allison 10-speed automatic. Maximum towing climbs from 36,000 pounds on the 2026 HD to 38,000 pounds with a gooseneck. The diesel is a $11,400 option on every 2500 HD trim. We'll go through the engine part by part in next week's post. Is the gas engine new too? The 6.6L gas V8 isn't all-new, but it's stronger: 412 horsepower and 472 lb-ft, up from 401 and 464. GM rates that 472 lb-ft as best-in-class standard torque among 2027 heavy-duty gas engines. The updates are mostly about durability and pulling from low rpm. There's a new intake manifold, a reworked lubrication system with an engine-mounted oil cooler, updated emissions hardware and a digital oil-level readout on the driver display. It's the standard engine on every 2500 HD trim, and it still runs through an Allison 10-speed. What changed with the steering and brakes? Both are new, and GM says each one is a first for the heavy-duty segment. Electric rack-and-pinion steering replaces the old hydraulic setup, and a system GM calls eBoost replaces the hydraulic brake assist. System What's new for 2027 Steering Electric power steering with about 30% more power than the current HD hydraulic gear, per GM. No pump, hoses or fluid. Full assist at any engine speed. Brakes eBoost electronic brake boost, larger 14.6-inch front rotors, new four-piston fixed front calipers, upgraded rear hardware, shorter pedal travel. Drive modes Tow/Haul tunes the engine, shifts, exhaust brake, grade braking, steering and brake boost for a load. New Terrain Mode on the ZR2 gives one-pedal off-road driving in 4HI and 4LO. One practical upside: steering and braking no longer share a single hydraulic source. GM also says the brake system can flag fade or a leak sooner, and it supports Adaptive Cruise Control and Automatic Emergency Braking. On a long pull over Lookout Pass with a camper behind you, steady assist and shorter pedal travel are the changes you'll notice. How much more does the 2027 Silverado 2500 HD cost? Announced 2500 HD pricing is $1,000 to $1,500 higher than 2026, depending on trim. The WT starts at $49,995 and the High Country at $78,195, both including the $2,795 destination charge. 2500 HD trim 2027 price with destination Increase vs 2026 MSRP WT $49,995 +$1,000 Custom $53,295 +$1,000 LT $56,695 +$1,000 LTZ $67,695 +$1,300 ZR2 $77,695 +$1,400 High Country $78,195 +$1,500 Those figures were reported by Autoblog, TFLtruck and CarBuzz; Chevrolet's own site hasn't posted MSRP yet. If price is the deciding factor, keep an eye on our new Chevrolet specials. 2027 Silverado 3500 HD pricing is not yet released. Are there any trim changes? The lineup is still six trims: WT, Custom, LT, LTZ, ZR2 and High Country. The one notable shuffle is the Trail Boss package, which Chevrolet now offers on the HD Custom for the first time. On the Custom, Trail Boss brings 20-inch wheels with BFGoodrich All-Terrain tires, the Z71 suspension package with twin-tube shocks, an Autotrac 2-speed transfer case and a Z71 skid plate. The ZR2 has a 1.5-inch lift, larger Multimatic DSSV dampers, rear e-locker and 35-inch mud-terrains, and picks up the new Terrain Mode. Trail Boss package pricing is not yet released, and Chevrolet hasn't confirmed whether the LT and LTZ keep a Trail Boss option for 2027. What hasn't Chevrolet announced yet? Quite a bit, so be wary of anyone quoting firm numbers on these: 3500 HD pricing Towing and payload for each cab, bed and axle setup Cab and bed configurations Fuel economy (HD pickups aren't EPA rated) Warranty terms for the 8.3L Duramax Full standard equipment by trim We'll update this post as GM publishes each one. Until then, the diesel's 38,000-pound gooseneck and 20,000-pound conventional maximums, and the gas engine's 19,000-pound maximum, are for properly equipped trucks, not what every truck on the lot is rated for. Talk to us about a 2027 Silverado HD GM expects the 2027 Silverado HD at dealers starting late 2026. Watch our new Silverado 2500 HD inventory for arrivals, or send the Knudtsen Chevrolet team a message with the trim, engine and trailer you have in mind. If a half-ton would cover your needs, compare it with the 2027 Silverado 1500. We're in Post Falls, a short drive from Coeur d'Alene and Spokane. Frequently Asked Questions What is the biggest change on the 2027 Silverado HD? The new 8.3L Duramax turbo-diesel V8, which makes 555 horsepower and 1,230 lb-ft of torque and replaces the 6.6L Duramax. Does the 2027 Silverado HD have a new body or interior? No. Chevrolet says the exterior may look familiar, and Edmunds reports the sheetmetal and interior carry over. The changes are in the engines, steering, brakes and trailering tech. How much did 2027 Silverado 2500 HD prices go up? Announced prices are $1,000 to $1,500 higher than 2026, depending on trim. The WT starts at $49,995 including the $2,795 destination charge. Is electric power steering a good idea on a heavy-duty truck? GM says its new system has about 30 percent more power than the hydraulic steering it replaces, gives full assist at any engine speed, has built-in redundancy and needs no pump, hoses or fluid. Is the Trail Boss available on the 2027 Silverado HD? Yes. Chevrolet offers the Trail Boss package on the HD Custom for the first time. Package pricing and LT or LTZ availability have not been released.