Is the 1997 5.7 Chevy suburban a TBI engine?

That year, Chevrolet transitioned to Vortec engines, which used a more advanced multi-port fuel injection system.

Here's why:

* TBI was an older technology that Chevrolet phased out in the early 1990s.

* Vortec engines, with their multi-port injection, offered improved fuel economy, performance, and emissions compared to TBI.

So, if you're looking at a 1997 Suburban with a 5.7L engine, you can be sure it's a Vortec engine.