Here’s an overview of the Chevrolet 5.3L Gen III LS engine along with some of the problems engine builders have encountered.

We grabbed an LQ4 LS truck engine from a junkyard, rebuilt it, tossed on a carburetor, and made 464 hp on the engine dyno!

Stock Junkyard LS. Richard Holdener Holdener took a stock, flat-top 5.3-liter LS and put it on an engine dyno to find a baseline power rating.

General Motors' LS series engines have been around since 1997, and have one key design feature that enables upgrades that significantly boost horsepower.

We grab an LQ4 LS truck engine from a junk yard, rebuild it, toss on a carburetor and made 464 hp on the engine dyno!