EXCLUSIVE: 2023 Chevy Silverado HD Will Pack an Updated Duramax V8 with Over 500 HP and This Monstrous Torque Number

Check out these rumored specs!

2023 chevy silverado hd gmc sierra hd duramax diesel specs

Will the 2023 Chevy Silverado HD and GMC Sierra HD be the first to break the 500 horsepower barrier in their heavy-duty pickup trucks? Here is the latest.

According to an insider report, GM is cooking up something very special for the next 2023 Silverado HD and 2023 Sierra HD pickup trucks. We have already seen several camouflaged prototypes testing in and around Colorado and across the country, but we had no indication about what will power these new beasts. Now we have this unofficial report that offers a glimpse into the new turbo-diesel Duramax power from GM.

image: Chevrolet

This unofficial report says that the next generation of the 6.6-liter turbo-diesel Duramax V8 will be rated at 505 horsepower and 1,085 lb-ft of torque. Naturally, these figures may change by the time the 2023 Chevy and GMC heavy-duty trucks hit the market. These numbers seem very plausible because they would put GM’s big diesel V8 into a leadership position for the segment.


Here are the big diesel numbers for the 2022 model year from Ford and Ram.

The latest 6.7-liter Power Stroke V8 diesel from Ford is rated at:

475 hp @ 2,600 rpm and 1,050 lb-ft of torque @ 1,600 rpm.

The latest high-output 6.7-liter Cummins I6 diesel from Ram is rated at:

420 hp @ 2,800 rpm and 1,075 lb-ft of torque @ 1,800 rpm.

Current Duramax V8 (L5P)

The current L5P 6.6-liter Duramax V8 was introduced in the 2017 model year with a very respectable 445 hp @ 2,800 rpm and 910 lb-ft of torque @ 1,600 rpm. For the 2020 model year and the new generation of GM’s heavy-duty pickups – the company introduced the new 10-speed (10L1000) Allison-branded automatic transmission.

The unofficial report also states that the automatic transmission and the read differential are also getting an upgrade for 2023 to handle more power and torque. GM may be going for a larger diameter ring gear for the rear differential.

Here are all the latest 2023 model year HD news (in the video below).