New GM Pickup V-8s
General Motors Unveils New V-8 Engines and Upgrades for 2027 Pickups
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The new 5.7-liter and 6.6-liter V-8s share components such as the water pump, rocker covers, rocker arms and oil pan, but use unique pistons, crankshafts, cylinder heads and camshafts. They also eliminate the traditional oil dipstick in favor of an oil-pan sensor that displays the reading on the digital dashboard.
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The upgraded 2.7-liter TurboMax four-cylinder will produce 350 horsepower and 455 pound-feet of torque—up 40 horsepower and 25 pound-feet—through changes including a new turbocharger, improved thermal management and redesigned pistons.
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GM increased the V-8s’ compression ratios to 12.0:1 for the 5.7-liter and 12.5:1 for the 6.6-liter, while adding larger throttle bodies, revised intake manifolds, both port and direct fuel injection, and a continuously variable oil pump with an on-engine oil cooler.
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GM President Mark Reuss said the company aims to maintain its truck leadership, declaring, “If we don't stomp the competition with these trucks, then I'd be very sad and questioning myself. That's the goal.” Chevrolet and GMC together have outsold Ford’s full-size pickup offerings since 2020, even though Ford’s F-Series remains the top-selling individual full-size truck line.
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The new pickup V-8s are derived from the small-block architecture introduced with the 2027 Chevrolet Corvette, but GM engineered them for towing, off-road use and long-distance driving rather than the racetrack and canyon-focused performance of the Corvette’s 6.7-liter LS6.
General Motors is betting big on gas engines for its next pickup trucks. The automaker revealed new V-8 engines for the 2027 Chevrolet Silverado 1500 and GMC Sierra 1500, replacing the current 5.3- and 6.2-liter versions with fresh 5.7-liter and 6.6-liter powerplants Motor Illustrated. The larger 6.6-liter will pump out 481 horsepower and 501 pound-feet of torque — enough muscle to haul and tow harder than before.
This engine push comes after Reuters reported that GM faced recalls on its current truck engines last year. The company is doubling down on gasoline pickups even as competitors embrace hybrids and electric vehicles. GM President Mark Reuss said the goal is simple: "If we don't stomp the competition with these trucks, then I'd be very sad and questioning myself."
Two New V-8s Pack More Power Than Before
The 5.7-liter engine produces 402 horsepower and 428 pound-feet of torque Motor Illustrated, a solid jump in grunt for daily towing. The 6.6-liter hits even harder with 481 horsepower and 501 pound-feet. Both use a higher compression ratio — 12.0:1 for the smaller engine, 12.5:1 for the larger — to squeeze more power from each combustion cycle.
GM engineered these V-8s with dual fuel injection, larger throttle bodies and a new oil pump that cools the engine oil on-board. The company ditched the traditional oil dipstick for a sensor that reads oil level on your truck's dashboard. While the engines share some components like water pumps and rocker arms, they use unique pistons, crankshafts and cylinder heads tuned for their different sizes.
The Turbo Four-Cylinder Gets a Solid Boost
GM also upgraded its 2.7-liter TurboMax four-cylinder engine, adding 40 horsepower and 25 pound-feet of torque Motor Illustrated. The new version now makes 350 horsepower and 455 pound-feet — enough to appeal to buyers who want efficiency without sacrificing power. Changes include a new turbocharger, better heat management and redesigned pistons that burn fuel more effectively.
The four-cylinder pairs with a 10-speed automatic transmission to maximize fuel economy. Buyers can also stick with GM's carryover diesel inline-six engine if they prefer. This gives Silverado and Sierra shoppers three strong engine choices for 2027.
GM's Truck Gamble Amid EV Uncertainty
Reuters reported that GM is focusing on fuel efficiency while competitors tap hybrids as a middle ground. But GM is leaning into pure gasoline performance for its flagship trucks. Full-size pickups are GM's profit engines — Chevrolet and GMC together have outsold Ford's pickup offerings every year since 2020, even though Ford's F-Series remains the single best-selling truck line.
The new V-8s start production in Flint, Michigan, with manufacturing eventually expanding to a GM plant in St. Catharines, Ontario. This move reflects GM's confidence in truck demand at a time when electric vehicle sales growth has slowed and the current administration is rolling back EV regulations.
These Engines Share DNA With the New Corvette
The new truck V-8s are built on the same small-block architecture as the 2027 Chevrolet Corvette Motor Illustrated, but engineered for completely different purposes. The Corvette's 6.7-liter LS6 is tuned for racetrack speed and canyon-carving performance. The truck versions prioritize towing capacity, off-road durability and long-distance reliability instead.
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