---
title: "GM Scraps Twin-Turbo Gas Inline-Six Truck and SUV Engine: Report"
date: "2023-03-06"
modified: "2023-03-06"
authors:
  - name: "James Gilboy"
    job_title: "Contributing Writer"
    link: "https://www.thedrive.com/authors/james-gilboy"
url: "https://www.thedrive.com/news/gm-scraps-twin-turbo-gas-inline-six-truck-and-suv-engine-report"
categories:
  - "GM News"
  - "News"
  - "News by Brand"
tags:
  - "Chevrolet"
  - "pickup"
  - "silverado"
  - "Truck"
---

# GM Scraps Twin-Turbo Gas Inline-Six Truck and SUV Engine: Report

![2023 Chevrolet SIlverado ZR2 Bison](<https://www.thedrive.com/wp-content/uploads/2023/03/06/2023-Chevrolet-Silverado-ZR2-Bison-5544.jpg>)
*\<em\>Chevrolet\</em\>*

General Motors is so proud of [its diesel-like 2.7-liter](<https://www.thedrive.com/news/gm-uses-diesel-tricks-to-make-its-four-cylinder-truck-engines-tougher>) that the turbo four-banger is basically replacing V6s in GM trucks. But the small-block V8s remain safe, especially now that GM has reportedly killed a six-cylinder truck engine that might've replaced bigger engines, like the 6.2-liter.

Last May, rumor spread that [GM was planning a six-cylinder truck engine](<https://www.thedrive.com/news/next-chevy-silverado-just-might-get-a-straight-six-gas-engine>) to compete directly with Stellantis' new turbo-six Hurricane motor. It's already used in the Jeep Grand Wagoneer and [it will supposedly power a Ram too](<https://www.thedrive.com/news/43688/inline-six-replacement-for-hemi-v8s-in-jeep-dodge-and-ram-models-almost-ready-report>). GM's engine was reportedly intended to power its full-size trucks and SUVs, such as the [Chevy Silverado](<https://www.thedrive.com/news/42308/2022-chevy-silverado-zr2-6-2l-v8-front-and-rear-lockers-and-dssv-dampers-in-a-full-size-truck>), Suburban, and its GMC and Cadillac siblings. The emphasis belongs on *was*, because the source that broke the news of the six-cylinder—*[GM Authority](<https://gmauthority.com/blog/2023/03/gm-turbo-six-cylinder-truck-engine-project-canceled-exclusive/>)*—now says it's dead in the water.

![](<https://www.thedrive.com/wp-content/uploads/2023/03/06/DSC_0342.jpeg>)
*GM's 2.7-liter four-cylinder turbo truck engine in the 2023 Chevrolet Colorado. *James Gilboy**

In its eulogy for the would-be engine, *GM Authority* reports the motor to have been an inline six with twin turbochargers. It was reportedly based on the 2.7-liter in [the solid 2023 Colorado](<https://www.thedrive.com/car-reviews/2023-chevrolet-colorado-first-drive-review-punchy-polished-and-mostly-practical>) and Silverado, likely giving it a displacement of around 4.0 liters. Output was reportedly estimated to be around 500 horsepower and 500 pound-feet of torque, though it's easy to imagine it making close to 650 lb-ft when napkin-mathed up from the 2.7's max of 430 lb-ft. Just speculation on our part, but it would've likely supplemented (if not replaced) the 3.0-liter Duramax diesel or naturally aspirated 6.2-liter V8.

However, with [GM investing in a new generation of its proven and popular small-block V8s](<https://www.thedrive.com/news/gm-confirms-a-new-small-block-v8-is-coming>), it has no obvious need for an equivalent engine. It'd be harder to package, more complex, and therefore costlier, all for what'd amount to a limited improvement in emissions. If it was killed this early in its reported development, the turbo six clearly never had a place in this world—as good an engine as it probably would have been.

GM declined to comment when reached by *The Drive*.

*Got a tip or question for the author? You can reach them here: james@thedrive.com*

## Author
James is a former staff writer for The Drive. He has changed the conversation around electrification, debunked misinformation online, and become a prominent hunter of what he calls "automotive cryptids."

### Author social links  
[Instagram](<https://instagram.com/jamesgilboy>)