2027 Chevrolet Silverado Limits 481-Horsepower V8 to Two Four-Wheel-Drive Trims
The 2027 Chevrolet Silverado 1500’s newly confirmed 5.7-liter V8 produces 402 horsepower and 428 pound-feet of torque, while the 6.6-liter V8 reaches 481 horsepower and 501 pound-feet. Chevrolet reserves that higher-output engine for four-wheel-drive ZR2 and High Country trucks, according to the engine matrix documented from GM’s 2027 Vehicle Order Guide. It is optional rather than standard in both trims.
The 5.7-liter V8 is standard only in High Country and optional in Work Truck, Custom Trail Boss, Silverado 1LT and Trail Boss. Custom and the fleet-oriented Silverado 2FL receive no V8 choice or any substitute for their standard TurboMax four-cylinder. Those trim-level listings are only the first ordering filter: cab, bed, drivetrain and package selections can eliminate additional combinations.
Four engines, but sharply different roles
Work Truck, Custom, Custom Trail Boss, Silverado 1LT, Silverado 2FL and Trail Boss all start with the turbocharged 2.7-liter TurboMax. It produces 350 horsepower and 455 pound-feet and is paired with a 10-speed automatic transmission. Its torque rating is 27 pound-feet higher than the 5.7-liter V8’s, although the V8 develops 52 more horsepower.
Most TurboMax-based trims provide an upgrade path. Work Truck, Custom Trail Boss, Silverado 1LT and Trail Boss can be configured with the 5.7-liter V8 or the returning 3.0-liter Duramax diesel. The diesel produces 305 horsepower and 495 pound-feet, leaving it only six pound-feet behind the larger V8’s torque rating.
Custom and Silverado 2FL are the exceptions. Their lack of an alternative engine makes the TurboMax mandatory, regardless of whether a customer prefers diesel torque or a V8. That restriction is especially consequential for fleet operators because Silverado 2FL is specifically positioned as a fleet model rather than a retail-focused upper trim.
ZR2 and High Country use the same V8 differently
ZR2 makes the Duramax diesel standard and offers the 6.6-liter V8 as its gasoline alternative. High Country starts with the 5.7-liter V8 and lets buyers select either the diesel or the 6.6-liter. Chevrolet therefore places its strongest gasoline engine behind two requirements: customers must choose one of those two upper trims and accept four-wheel drive.
A first-drive evaluation of the 2027 Silverado tested the 6.6-liter V8 in both eligible trims. The reviewer reported forceful acceleration from the ZR2 on a high-speed off-road course, while the same engine delivered a more refined character in the High Country. Those impressions illustrate how Chevrolet is using one powertrain in two distinct applications: an off-road model and a luxury-oriented truck.
Higher output does not automatically make the 6.6-liter the Silverado’s broadest utility engine. Chevrolet lists the 5.7-liter with the truck’s maximum towing capacity of up to 13,700 pounds when properly equipped. The 5.7-liter’s availability across work, midrange and upper-level trims also gives buyers more freedom to match the engine with different equipment groups.
Configuration rules can override the trim chart
The 5.7-liter’s wider distribution still carries important restrictions. A Work Truck requires the WT Convenience Package to receive that V8, and Chevrolet does not offer the combination with a Regular Cab and Standard Bed. The Duramax is available in Work Truck only with the Crew Cab, while Custom and Silverado 2FL cannot receive the diesel at all.
Production timing creates another boundary. GM identifies Regular Cab and Double Cab versions as late availability, so some configurations shown in the guide may not be orderable when initial production begins. The guide is also a live ordering document that Chevrolet can revise as package combinations, production capacity and component availability change.
For buyers pursuing the 6.6-liter V8, however, the initial boundary is unambiguous: neither Work Truck nor any Custom, Silverado 1LT, Silverado 2FL or Trail Boss configuration qualifies. Access to the 481-horsepower engine begins and currently ends with four-wheel-drive ZR2 and High Country models unless Chevrolet revises the order guide.
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By Thomas Caldwell — AMI’s senior editor for mechanical and mobility engineering, covering vehicle electronics, systems integration, electrification, chassis systems, propulsion, and safety policy.
