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What does the ls mean on a Chevy truck?

On a Chevy truck, "LS" doesn't refer to a single, specific feature. Instead, it usually indicates the type of engine the truck is equipped with. LS is a family of small-block V8 engines that have been used across various GM vehicles (including Chevy trucks) for many years. They are known for their relatively high power output and relatively good fuel efficiency compared to some other engine families.

So, seeing "LS" on a Chevy truck generally means it has an engine from the LS engine family, but the *specific* LS engine (like LS1, LS2, LS3, etc.) will vary depending on the year and model of the truck.