GM releases sixth-generation V-8 specifications for Silverado and Sierra pickups

The short version

• GM released specifications for two sixth-generation small-block pickup engines, Car and Driver reports: a 5.7-liter with 402 horsepower and a 6.6-liter with 481 horsepower.[Car and Driver]
• Both engines are slated to debut in the 2027 Chevrolet Silverado 1500 and GMC Sierra 1500, scheduled to arrive by the end of the year.[Car and Driver]
• The new 5.7-liter exceeds the outgoing 5.3-liter’s 355 horsepower, but GM has not yet supplied acceleration figures.[Car and Driver]

Key facts

• According to Car and Driver, GM’s 5.7-liter V-8 produces 402 horsepower and 428 pound-feet of torque.[Car and Driver]
• The reported output of the 6.6-liter V-8 is 481 horsepower and 501 pound-feet of torque.[Car and Driver]
• Both engines are planned for the 2027 Chevrolet Silverado 1500 and GMC Sierra 1500, scheduled to arrive by year-end.[Car and Driver]
• Both engines retain a cam-in-block design, rocker arms and two valves per cylinder, according to Car and Driver.[Car and Driver]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.

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