To ensure reliability, purchase GM part # 55504792 Cylinder Head Assembly (W/ Valve). It is sometimes referred to as Cadillac Cylinder Head. 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 Cadillac XT4, XT5, XT6 models.
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