To ensure reliability, purchase GM part # 3744043 Pulley, Crankshaft. It is sometimes referred to as GM Crankshaft Pulley, GM Harmonic Balancer. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts.
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