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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesThe 8.3L Mongoose and Chevrolet ZZ572 are not direct substitutes: GM announced the Mongoose as a turbo-diesel for its 2027 heavy-duty pickups, while the ZZ572 is a gasoline crate engine intended for competition use. Chevrolet publishes horsepower and torque for two ZZ572 versions; GM’s September 21, 2026 first-look announcement gave no Mongoose output or price. The ZZ572 is larger by displacement, but that alone cannot tell you which engine makes more power or better suits your needs.
What the 8.3L Mongoose and Chevrolet 572 are
General Motors announced the Mongoose as an 8.3L Duramax turbo-diesel V8 for the refreshed 2027 Chevrolet Silverado HD and GMC Sierra HD. GM described its September 21, 2026 announcement as a first look, with more information to come from Chevrolet and GMC. The announcement did not include horsepower, torque, or vehicle pricing. GM’s announcement is the official source for the name, displacement, configuration, and announced applications.
Chevrolet Performance lists two 572 cu. in. (9.4L) big-block crate engines: the ZZ572/620 Deluxe and ZZ572/720R Deluxe. They are gasoline engines marked for competition use, not factory-installed alternatives to the Mongoose in a heavy-duty pickup. Their different purpose and fuel type make a simple engine-to-engine power comparison incomplete.
How their published specifications compare
| Engine | Displacement | Published horsepower and torque | Application and fuel | Price in cited official source |
|---|---|---|---|---|
| GM 8.3L Duramax Mongoose | 8.3L; GM announcement dated September 21, 2026 | Not stated in GM’s September 21, 2026 first-look release | Turbo-diesel announced for refreshed 2027 Silverado HD and Sierra HD pickups | Not stated in GM’s September 21, 2026 release |
| Chevrolet ZZ572/620 Deluxe | 572 cu. in. (9.4L); Chevrolet Performance product page accessed October 4, 2026 | 621 hp at 5,400 rpm; 645 lb-ft at 4,200 rpm | Gasoline crate engine for competition use; premium pump fuel recommended | Not stated on Chevrolet Performance’s product page accessed October 4, 2026 |
| Chevrolet ZZ572/720R Deluxe | 572 cu. in. (9.4L); Chevrolet Performance product page accessed October 4, 2026 | 727 hp at 6,300 rpm; 680 lb-ft at 4,900 rpm | Gasoline crate engine for competition use; race gas recommended | Not stated on Chevrolet Performance’s product page accessed October 4, 2026 |
The two ZZ572 ratings and fuel recommendations come from Chevrolet Performance’s 572 product page. The published displacement makes the 572 a larger engine than the Mongoose: 9.4L versus 8.3L. But displacement does not establish comparative power, and GM has not published a Mongoose horsepower or torque figure in its cited announcement.
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How much horsepower does the 8.3L Mongoose make?
GM’s September 21, 2026 announcement does not state Mongoose horsepower or torque. Any specific output number attributed to the Mongoose should therefore be treated as unconfirmed unless supported by a later official specification. Do not substitute ratings for another Duramax or a competing diesel: those are different engines, not Mongoose test results.
At the time of its September 21, 2026 report, GM-Trucks.com also listed towing and payload ratings, transmission, trims, pricing, and on-sale timing as details that had not been announced. That is a dated account of the information available then, not proof that every item remains unpublished. Check GM’s official release and GM-Trucks.com’s contemporaneous report for their respective scopes.
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Which ZZ572 version is the better comparison?
ZZ572/620 Deluxe
The ZZ572/620 Deluxe is rated at 621 hp at 5,400 rpm and 645 lb-ft at 4,200 rpm. Chevrolet recommends premium pump fuel for this competition-use crate engine. Its part number is 19331583.
ZZ572/720R Deluxe
The ZZ572/720R Deluxe is rated at 727 hp at 6,300 rpm and 680 lb-ft at 4,900 rpm. Chevrolet recommends race gas. Its part number is 19331585.
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The 720R is the higher-output choice of the two published ZZ572 versions, but it also has a different fuel recommendation. Neither is an apples-to-apples comparison with a factory heavy-duty diesel whose output remains unstated in GM’s cited release. Choose between the ZZ572 trims based on the intended competition setup and fuel, rather than treating either rating as a prediction of how the Mongoose will perform.
What the cost comparison can—and cannot—tell you
The cited GM release gives no price for the Mongoose or the 2027 trucks. Chevrolet Performance’s accessed 572 page lists no retail price and directs shoppers to dealers. That leaves no supported, like-for-like price comparison between these products.
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There is also a basic difference in what you would be buying: the Mongoose is announced as an engine in a complete factory pickup, while the ZZ572 is a crate engine. A crate-engine quote is not the cost of a ready-to-drive truck; installation, supporting parts, vehicle fitment, and the intended use all affect the project. To get a useful current figure, ask a Chevrolet Performance dealer for a quote on the specific part number and confirm what is included and what the installation requires. For a 2027 truck, request pricing for the specific configuration and market once GM or a dealer provides it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which one suits your project?
- Choose the Mongoose as the relevant option if you are considering a factory 2027 Silverado HD or Sierra HD and want the announced 8.3L Duramax diesel. Its published performance, truck ratings, availability, and price must be verified in later official information before you can judge those factors.
- Consider the ZZ572/620 Deluxe if you need a gasoline competition-use crate engine, the 621-hp published rating fits your plan, and premium pump fuel matches your setup.
- Consider the ZZ572/720R Deluxe if you need the higher published ZZ572 rating—727 hp—and your competition setup supports the recommended race gas.
Do not assume the ZZ572 is a bolt-in replacement for a Silverado or Sierra HD engine. Confirm fitment, included components, supporting systems, and installation requirements with the dealer and installer before buying.
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