2027 Chevy Silverado and GMC Sierra Get Bigger, More Powerful V8sAutoblogEarl LeeFri, September 18, 2026 at 11:30 AM UTCAdd us on GoogleAutoblog and Yahoo may earn commission from links in this article.Improvements for the FutureGeneral Motors' new small-block V8 is ready to go into the company's next-generation pickup trucks. These new motors will find their way into the 2027 Chevrolet Silverado 1500 and the GMC Sierra 1500. The automaker touts that its new V8s will bring improved power, torque, and efficiency as it enters its sixth-generation small-block architecture.The L76 5.7-liter and L78 6.6-liter V8 engines will find their way into GM's next-generation light-duty trucks. This family of V8s is now on par with the other small blocks found in the 2027 Corvette Stingrays, Grand Sports, and Grand Sport Xs, which are powered by the LS6 6.7-liter V8 engines.GMThe Return of the 350s and 400sThe L76 and L78 mark GM's return to the 350 and 400 cubic-inch displacement class of motors, and the automaker employed advanced modeling and simulation toolsets along with proven hardware efficiency and durability testing. The company now claims that the new small-block V8s will continue to meet regulations and exceed customer expectations, and apparently, remove the good ol' oil dipstick.AdvertisementAdvertisementMore displacement equals more power, and there is an old saying that many of us already know at this point, but GM revealed power and torque figures in its announcement, citing that the new engines will develop class-leading power and torque figures.The L76 5.7-liter V8 will make 402 horsepower and 428 lb-ft of torque, and the company claims that it can tow more than its rivals in the same class, with a maximum rating of 13,700 pounds properly equipped.The L78 6.6-liter V8, it produces 481 horsepower and 501 lb-ft of torque. In both engines, GM said that both motors feature higher compression ratios for more efficient combustion, more airflow via larger throttle bodies, and new intake manifolds with tuned runners. This is all on top of a displacement bump by adding 6 mm of stroke, going from 5.3 liters to 5.7 liters in the L76, and 6.2 liters to 6.6 liters in the L78.Around the engine, GM also reworked some of the systems, which include a dual-fuel system that combines both direct and port injection on the fuel rail with the goal of optimizing power, efficiency, and emissions windows. There is also a new lubrication system with a continuously variable oil pump, built-in oil cooler, and reworked oil feed locations for additional oil pressure consistency.GMMade in the U.S.A.As a closing statement in its announcement, GM reiterated that these engines will be made in the United States at GM's Flint Engine Operations, Tonawanda Propulsion, and St. Catharines Propulsion plants. This is in line with GM's prior announcements of investing in North American manufacturing.AdvertisementAdvertisementOn top of that, GM's other engines will also receive performance upgrades, which include the 3.0-liter Turbo-Diesel Duramax engine that makes 305 horsepower and 496 lb-ft of torque, adding 40 horsepower and 25 lbs more than the previous iteration. All powertrains will also be paired with the company's 10-speed automatic transmission and 34-gallon fuel tank that gets up to 900 miles of range with the automaker's diesel powerplant.General MotorsThis story was originally published by Autoblog on Sep 18, 2026, where it first appeared in the News section. Add Autoblog as a Preferred Source by clicking here.
