Genuine OEM Hyundai Cylinder Block Guide Pin, part number 2117104000. This essential engine component is installed within the engine cylinder block, serving to precisely align the cylinder head during assembly. Proper alignment is critical for maintaining a perfect seal between the cylinder head and block, preventing leaks and ensuring optimal engine performance. Using a genuine OEM guide pin guarantees the correct dimensions and material, ensuring accurate fitment and long-term reliability for critical engine sealing.