Description: S-series. Astro, Safari. All models. 5.7l. 4.3l. Express, savana. Corvette. Auto trans. Synchronizes the rotation of the crankshaft and the camshaft(s) to help ensure that the engine's valves open and close at the proper time during each cylinder's intake and exhaust strokes

Description: 5.7l. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors