The larger-displacement V8 offered on higher trims of the Silverado and Suburban — genuinely stronger towing and payload capability, built on the same family architecture as the 5.3L Vortec, with the same AFM lifter consideration to screen for.
This is the same small-block family as the 5.3L Vortec covered elsewhere on this site, bored and stroked for meaningfully more power and torque — the extra displacement is popular on High Country and premium trims where towing capacity matters most. The core reliability profile carries over directly from the 5.3L: genuinely strong bottom-end durability, with Active Fuel Management (AFM) lifter wear as the one well-documented concern worth screening for on any example.
Not a guarantee, but a pattern seen consistently across owner forums and independent-garage reporting.
First AFM lifter tapping noise and associated oil consumption on affected examples, consistent with the related 5.3L.
Lifter replacement or AFM-disable kits become a common proactive repair at this stage.
Examples with the system proactively disabled, or without symptoms, commonly continue well beyond this with no major work.
Listen for a ticking or tapping noise at idle, especially from a cold start — the same AFM lifter check that applies to the related 5.3L.
Check oil level and condition yourself if possible, since consumption on affected examples can outpace dashboard warnings.
Ask whether the truck has ever had an AFM-disable device installed — a popular, well-regarded preventative fix in the truck community.
Model-specific pages, with notes on how it behaves in that particular car.