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Doing a valve job or engine rebuild on your GM vehicle? This is the real deal—a GM Genuine Parts exhaust valve with part number 12637241. It's the exact same component that was installed at the factory, engineered and validated by GM for optimal performance and durability.
Using genuine valves ensures proper fitment, heat tolerance, and longevity. They're made to strict OEM specifications for material, dimensions, and hardening. Whether you're replacing a burnt valve or doing a full valve train overhaul, using these genuine parts is the best way to restore your engine to like-new condition. Always verify this part number matches your specific engine application (displacement, year, model). For a reliable, long-lasting repair, don't settle for anything less than genuine.
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