General Motors knows it has a problem. While the company’s full-size trucks remain some of the best-selling vehicles in North America, ongoing concerns surrounding the 6.2-liter L87 V8 have created a cloud of skepticism among some loyal truck buyers.
Now, as GM prepares to launch the next-generation 2027 Chevrolet Silverado and GMC Sierra, the automaker is reportedly taking major steps behind the scenes to improve engine quality, durability, and long-term reliability.
According to GM Authority, the company is tightening manufacturing standards and bringing more critical production processes in-house as it develops its new Gen 6 Small Block V8 engines.
The timing is important, as the next Silverado and Sierra are expected to be among GM’s biggest product launches of the decade, and the company simply cannot afford another wave of reliability controversies surrounding its flagship trucks. Especially not at a time when buyers are already questioning whether modern trucks have become too complicated for their own good.
GM’s Current V8 Problems Hurt Buyer Confidence
The current-generation 6.2-liter L87 V8 has faced increasing scrutiny over the past several years. While the engine delivers impressive power and strong towing capability, it has also been linked to recalls, valve lifter failures, customer complaints, and multiple lawsuits.
Some owners reported catastrophic engine failures, while others experienced issues tied to the cylinder deactivation system and valvetrain components. The problems became serious enough that many truck buyers started actively discussing reliability concerns online before purchasing new GM trucks.
That is a dangerous situation for any automaker, especially in the fiercely competitive full-size truck segment where reputation is enormously important.
Pickup buyers tend to keep vehicles for years, tow heavy loads, and rack up high mileage. Reliability problems can permanently damage trust, particularly when trucks routinely cost $70,000 or more. GM now appears determined to avoid repeating those mistakes with the next generation.
New Gen 6 V8 Engines Are Coming
The upcoming Silverado and Sierra are expected to debut entirely new Gen 6 Small Block V8 engines. According to reports, the current 5.3-liter L84 and 6.2-liter L87 engines will eventually be replaced by new 5.7-liter and 6.6-liter V8 variants.
While GM has not officially revealed detailed specifications yet, the company is reportedly making durability and manufacturing consistency a top priority during development.
Sources familiar with the project told GM Authority that the automaker is implementing stricter quality-control procedures for several key engine components. Certain manufacturing processes are also reportedly moving in-house rather than relying on outside suppliers.
That may sound minor, but it can make a major difference in production consistency. Bringing critical operations under direct company oversight allows GM to monitor tolerances, component quality, and assembly standards more closely throughout the manufacturing process. For buyers worried about long-term reliability, that is likely exactly what they want to hear.
GM Is Investing Billions Into Production
The new engines are also tied to massive manufacturing investments across North America. GM has already announced significant funding for facilities including Tonawanda Propulsion in New York, Flint Engine Operations in Michigan, Saginaw Metal Casting Operations, and the St. Catharines Propulsion Plant in Ontario.
Those investments are expected to support production of the next-generation small-block V8 family and related powertrain components.
Interestingly, GM continues to invest heavily in combustion engines even as it simultaneously pushes electric vehicles, which shows that demand for traditional gasoline-powered trucks remains extremely strong.
While EV adoption has slowed in some segments, full-size pickups with large engines continue generating enormous profits for manufacturers.
GM clearly understands it still needs to deliver dependable V8 trucks if it wants to maintain its position against Ford and Ram.
The Truck Wars Are Far From Over
The next-generation Silverado and Sierra are expected to arrive for the 2027 model year, with production reportedly beginning in late 2026. Design leaks suggest the trucks will adopt a more squared-off and upright appearance, potentially giving them an even more imposing presence on the road.
GM is also expected to continue offering updated versions of the 2.7-liter turbocharged four-cylinder and 3.0-liter Duramax diesel alongside the new V8s.
Perhaps most importantly for GM, the timing could work in its favor. Reports suggest Ford’s next major F-Series redesign may not arrive until closer to 2029, potentially giving GM a valuable opportunity to strengthen its market position. Still, none of that will matter if reliability problems continue.
Modern trucks have become incredibly advanced machines loaded with technology, luxury features, and increasingly complex drivetrains. Yet for many buyers, the basics still matter most: strong engines, dependable performance, and the confidence that the truck will survive years of hard use.
GM appears to recognize that reality and now seems focused on making sure its next generation of V8 trucks earns back some of the trust that recent engine problems may have damaged.