To ensure reliability, purchase GM part # 558873 Valve, Exhaust. It is sometimes referred to as GM Exhaust Valve. 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. This part fits specific Buick Century, Lesabre, Regal models. It fits Cadillac Deville, Fleetwood, Seville. It also fits Chevrolet Caprice, Impala, Malibu. This also fits Pontiac 6000, Bonneville, Grand Prix.
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