A common issue with the 5.3 engine is AFM lifter failure. In this video, we diagnose the problem and replace the failed AFM lifter and pushrod to get the engine running properly again. Follow along ...

The L99 is a 400-horsepower engine while its fraternal twin--LS3--is rated at 422 hp. The difference lies in the valvetrain; as the short-block, heads, and intake manifold are identical. One small ...

General Motors’ Active Fuel Management system has been around long enough to earn both fans and vocal critics, and that split has created a simple but urgent question for buyers: which GM engines ...

Jasper Engines & Transmissions releases General Motors (GM) Gen IV 5.3L Class 1 engine, with an available DOD/AFM Deleted option. The remanufactured engine is available for model-year 2007-2009 ...