The product is a vintage OEM GM crankshaft pulley designed for 1968-1970 Pontiac vehicles with a 455, 428 or 400 GTO engine. Made in the United States, this part features a 1-groove design for optimal belt tension and efficiency. Specifically labeled with GM part numbers 9790843 or 9790843 YC, this crank pulley is a direct fit for the specified vehicle models, ensuring compatibility and quality performance. Ideal for car enthusiasts looking to restore or upgrade their Pontiac GTO with authentic GM parts from the past.