in ,


Hennessey Sees What The Full-Size SUV Can Do From The Factory

2021 Tahoe RST
Photo copyright

The 2021 Chevrolet Tahoe has been trickling into dealerships nationwide right now. By all accounts, the all-new SUV is a revolutionary product, and brings new levels of sophistication to the nameplate. Namely, an independent rear suspension that not only improves ride and handling, but also helps expand interior cargo volume some 30 percent, while barely growing in overall exterior dimensions.

That said, a tried-and-true powertrain combination can still be found under the hood: a standard 5.3L L84 V8 engine pushing out 355 horsepower, and an optional 6.2L L87 V8 pushing out 420 horsepower. Both engines feature dynamic fuel management, which is a technology that allows the engine to operate on a variable cylinder combustion operation, from all eight, down to just one. The 3.0L LM2 diesel engine will also be available on the 2021 Chevrolet Tahoe.

Just as the new SUV is hitting dealerships, its also being ordered by tuning shops. In this case, Hennessey Performance Engineering. They appeared to have gotten their hands on a 2021 Tahoe with the optional 6.2L V8, and wasted no time on strapping it to the dynomometer. The results? 369 horsepower and 397 lb-ft of torque at the rear wheels. The video is just below.

Considering their mechanical sameness, this dyno test result for the 2021 Chevrolet Tahoe with the 6.2L L87 V8 can also be applied to the 2021 GMC Yukon and 2021 Cadillac Escalade with the same engine. As can its locked ECU. That’s right, the cybersecurity of GM’s Global B electrical architecture is present and accounted for in all T1 platform SUV products. And we told everybody who would listen a while ago. But unlike the clickbait C8 Corvette videos, Hennessey appears to be coming clean. In their video caption, they state the following:

“We hope that GM will consider working with SEMA and the aftermarket industry to come up with a tuning solution for these vehicles. But for now and the foreseeable future, stock power is about all you’re going to get out of their new vehicles. If you want to modify your new SUV you’ll need to buy something else.”

We told you so.

2021 Chevrolet Tahoe and Suburban

Written by Manoli Katakis

Muscle Cars & Trucks was founded by Manoli Katakis - an automotive media veteran that has been covering the latest car news since 2009. His journalism has uncovered dozens of major product changes, updates, plans, and cancellations long before automakers were ready to make things official.

Some highlights over the years of his reporting include the uncovering of the Zora trademark before anybody else reported on the coming of a mid-engine Corvette, as well as the dead-accurate reporting of the coming of the Chevrolet Colorado ZR2, two years before it hit the market, and even before the debut of the concept vehicle. This type of reporting has immediately continued here, with reports of the original seventh-generation Camaro plans being shelved, as well as what's in store for the Chevrolet Silverado.

Some of his work can be found on massive automotive media outlets, such as Motor1. He also has been a guest on the 910AM Radio Station with Detroit News auto critic Henry Payne, as well as the enthusiast-oriented Camaro Show podcast.

Over the years, Manoli has interviewed various automotive industry titans, leaders, and people that make things happen otherwise. These include figureheads such as GM CEO Mary Barra, GM President Mark Reuss, automotive aftermarket icon Ken Lingenfelter, Dodge firebrand Tim Kuniskis, along with various chief engineers of vehicles such as the Ford F-150 & Mustang, Chevrolet Camaro & Corvette, and many more.

At MC&T, Manoli is taking his journalism expertise, deeply planted sources, driving abilities, and automotive industry knowledge to new levels, covering more vehicles and brands than ever before. This is the place where you will continue to read groundbreaking stories about American performance vehicles, pickup trucks, and sport utility vehicles. Here is where you’ll also read insights and quotes from various automotive subject matter experts on the latest relevant products, as well as some of the latest official news from their manufacturers.

Fun facts: he also once beat Corvette Racing driver Tommy Milner in an autocross with a Chevrolet Bolt EV. The biggest vehicle he’s ever driven is a John Deere mining truck. Besides a go-kart, the smallest vehicle he’s driven has been a Hyundai i10. He’s also spent time in the cockpit of various American performance vehicle icons, including the fifth-generation Chevrolet Camaro Z/28, Dodge Challenger Demon, and Ford Mustang GT350R. He has reviewed dozens of trucks, SUVs, and performance vehicles over the years.

One of his favorite new vehicles on the market today happens to be the Chevrolet Colorado ZR2 Bison. He is also a card carrying member of the Sports Car Club of America, and regularly participates in Detroit Region autocross events.


Leave a Reply
  1. Okay so let’s see a blown 6.2. I will never get a 5.3. No replacement for CI’s add a blower or twin turbos, probably a good chip and I am good to go as long as it Isn’t black.

  2. I had a 2018 z-71 5.3 bought a 21 Trai boss 6.2. The only thing I can say is Beast mode in a truck.

Leave a Reply

Your email address will not be published. Required fields are marked *

Electric Ford F-150 Assembly Plant Rouge EV Center