What is a Chevy Tahoe 4.9 vortec?

The "Chevy Tahoe 4.9 Vortec" refers to a specific engine option found in some older model years of the Chevrolet Tahoe SUV. It's not a common designation you'll see often because it uses the older displacement figure (4.9L) instead of the more common way of referring to it as a 300 cubic inch engine.

Essentially, it's a 300 cubic inch (4.9 liter) Vortec V8 engine. The "Vortec" designation indicates a specific generation of General Motors engines known for their improved efficiency and performance compared to earlier designs.

You're unlikely to find many of these Tahoes on the road today, as this engine was used in earlier generations of the vehicle, likely before the mid-2000s. More modern Tahoes utilize larger displacement engines.