Thoroughly tested for leak-resistant performance Uniform wall sections and smooth coolant-flow cavities for efficient operation Coated seals with a stainless steel spring for durability Heat-treated impeller shafts supported by high-quality ball/roller bearings for smooth, reliable operation Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE) GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors GM engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle GM regularly updates production and service part designs to integrate new materials and technologies