Engine Timing Crankshaft Sprocket

All models. 5.0l. Express, savana. With 4l80e trans. Crankshaft gear. Calif. To 01/01/1985. 5.7l. 2nd Design. .40/.41" Tooth Width. Corvette. Auto trans. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

Engine Timing Chain

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