A new GMC video takes buyers inside GM’s testing of its sixth-generation small-block V8, including a teardown after durability testing. That matters beyond GMC: the new engine family powers both the 2027 Chevrolet Silverado 1500 and GMC Sierra 1500.
The Nov. 5 video, “Putting the Next-Gen Sierra V8 to the Test,” visits the GM Propulsion Center. It offers a look at the development work behind the new engines, from controlled testing to the way they respond on the road.
Inside GM’s V8 test program
GMC organizes the 8-minute, 42-second video around several stages of engine development. The dyno segment begins at 0:29, followed by a power run at 1:52 and a tilt-stand segment at 2:40. The component-inspection chapter starts at 4:27, with the road test beginning at 6:33.
The video’s description also highlights drive-mode tuning. That is a useful part of the story for truck shoppers. Peak output is one consideration; how an engine responds to the driver is another. A factory test video can help explain the work behind those two parts of the driving experience.
What changed in the 2027 Silverado V8 engines
In its official engine announcement, GM detailed two new gasoline V8s for the light-duty Silverado and Sierra. The 5.7-liter L76 produces 402 horsepower and 428 pound-feet of torque. The 6.6-liter L78 produces 481 horsepower and 501 pound-feet.
Both use port and direct fuel injection. GM also describes a revised lubrication system with a continuously variable oil pump, an on-engine oil cooler and reworked oil-feed locations intended to provide more consistent oil pressure.
Those changes give buyers more to consider than the displacement increase alone. Our 2027 Silverado and Sierra V8 breakdown has more on the engine lineup, while a separate GM engineer interview covers the cylinder-deactivation lifter changes.
What truck buyers can learn from the teardown
For shoppers comparing these trucks, the testing footage is useful background. It shows how GM presents its development process and puts the teardown alongside power testing and road tuning, rather than treating a horsepower number as the whole story.
There is still a difference between a manufacturer’s test demonstration and a long-term reliability record. This video does not establish how the new V8 family will hold up across years of towing, cold starts and daily use in customer trucks.
Buyers can use it to understand the engineering work, then weigh that against driving impressions, ownership costs and their own towing needs. The durability verdict will take more than one factory video.
