Power Performance Specs of the 2027 Duramax 3500 Diesel Engine Originally published March 24, 2026 · Updated September 20, 2026 2026 Silverado 3500 HD LTZ dually shown. The Duramax diesel is available on every HD trim. The Short Version "2027 Duramax" means two different engines: the 3.0L Duramax in the redesigned 2027 Silverado 1500 and the Duramax turbo-diesel V8 in the Silverado 2500 HD and 3500 HD. The 1500's 3.0L Duramax makes 305 hp and 495 lb-ft. The HD diesel gets a new code for 2027, L6P, replacing the L5P. GM has not released its displacement, horsepower or torque. For reference, the 2026 6.6L Duramax makes 470 hp and 975 lb-ft and tows up to 36,000 lb in the 3500 HD. Searches for the 2027 Duramax turn up a mix of numbers, because Chevrolet now sells two very different diesels under that name. Here is which is which, what has been released and what has not. It is the diesel behind our Silverado 3500HD trucks. The three Duramax numbers side by side Engine Truck Power Torque Status 6.6L Duramax turbo-diesel V8 (L5P) 2026 Silverado 2500 HD and 3500 HD 470 hp at 2,800 rpm 975 lb-ft at 1,600 rpm 2026 ratings Duramax turbo-diesel V8 (L6P) 2027 Silverado 2500 HD and 3500 HD Not released Not released New for 2027 3.0L Duramax turbo-diesel 2027 Silverado 1500 305 hp 495 lb-ft Released by GM Only one of the three rows is a 2027 rating, and it belongs to the half-ton truck. The HD diesel: what L6P means The 2027 ordering documents for the Silverado 2500 HD and 3500 HD list the available diesel as L6P, a Duramax turbo-diesel V8. It replaces the L5P used in the 2026 truck. The documents give no displacement, horsepower or torque, and the standard gas engine moves from L8T to L8S at the same time. A new code means GM changed the engine in some way. It does not say the engine is larger or more powerful. Industry reports have speculated about a larger displacement and GM has not confirmed it, so we would treat any 2027 number as a guess until GM releases the ratings. The 2027 Silverado 2500HD guide covers what else carries over. What the 2026 6.6L Duramax delivers Power: 470 horsepower at 2,800 rpm and 975 lb-ft of torque at 1,600 rpm. Transmission: Allison 10-speed automatic. Towing, Silverado 3500 HD: up to 36,000 pounds on a gooseneck, 32,000 on a fifth-wheel and 20,000 on a conventional hitch, with the Max Trailering Package. Towing, Silverado 2500 HD: up to 20,000 pounds conventional and 22,050 on a gooseneck or fifth-wheel, with the Max Trailering Package. Warranty: the Duramax powertrain is covered for 5 years or 100,000 miles. Fluids: the Duramax uses diesel exhaust fluid (DEF), which you keep topped up. The 2027 ordering documents tie the Max Trailering Package to the Duramax and the gooseneck/fifth-wheel prep package, the same pairing as 2026. Our 2500HD vs 3500HD comparison shows how the two trucks split those ratings. The 3.0L Duramax in the 2027 Silverado 1500 The redesigned 2027 Silverado 1500 offers a 3.0L Duramax turbo-diesel rated at 305 horsepower and 495 lb-ft of torque. It tows up to 12,000 pounds in a crew cab 4WD with the Max Trailering Package. It is not an HD engine, and it is a different engine from the 6.6L-class diesel in the 2500 HD and 3500 HD. Our 2027 Silverado 1500 towing guide and the specs page cover the 1500. Which Duramax fits your work? Daily driving and lighter trailers: the 3.0L in the 1500, up to 12,000 pounds. Heavy trailers: above the 1500's top rating of 13,700 pounds, which comes with the 5.7L V8, you are shopping a 2500 HD or 3500 HD. Gooseneck and fifth-wheel work: the 3500 HD, especially the dually, which carries the 36,000-pound rating. Not sure where your load falls? The 3500HD LTZ review and the 3500 DRW page show what the HD trucks look like, and the 3500 HD dually guide covers the towing by hitch. When will the new Duramax arrive? GM Authority reports 2027 Silverado HD production starting in November, with the Crew Cab first, and calls the dates tentative. GM has not announced when trucks reach dealers. Trucks with the 2026 Duramax are what our Bentonville, Springdale and Fayetteville pages cover today, and the chassis cab page covers work-body builds. Common questions about the 2027 Duramax What are the 2027 Duramax specs? There are two 2027 Duramax diesels. The 3.0L Duramax in the 2027 Silverado 1500 makes 305 horsepower and 495 lb-ft of torque. The Duramax in the 2027 Silverado 2500 HD and 3500 HD carries a new engine code, L6P, and GM has not released its horsepower, torque or displacement. Is the 2027 Silverado 3500 HD Duramax bigger than the 2026? GM has not said. The 2026 engine is a 6.6L V8 making 470 horsepower and 975 lb-ft. The 2027 ordering documents list a Duramax turbo-diesel V8 with a new code and no displacement, so we will not guess. What is the L6P Duramax? L6P is the 2027 engine code for the available Duramax turbo-diesel V8 in the Silverado 2500 HD and 3500 HD. It replaces the L5P used in the 2026 truck. Does the 2027 Duramax make more than 470 horsepower? That has not been announced. 470 horsepower and 975 lb-ft are 2026 ratings, and any site listing them as 2027 specs is carrying the 2026 numbers forward. How much can a Duramax Silverado 3500 HD tow? The 2026 3500 HD tows up to 36,000 pounds on a gooseneck hitch, 32,000 on a fifth-wheel and 20,000 on a conventional hitch with the Duramax and Max Trailering Package. 2027 ratings have not been released. Which 2027 Duramax should I choose? The 3.0L Duramax in the 2027 Silverado 1500 suits daily driving and trailers up to 12,000 pounds. Above the 1500's 13,700-pound top rating, you are shopping a heavy-duty truck with the 6.6L-class Duramax. Tell us what you tow and how often, and we will point you to the right engine. George Nunnally Chevrolet is at 2700 SE Moberly Ln in Bentonville. Call (479) 319-2494 or contact us. Camioneta 3500HD en español.