GM Genuine Parts Engine Cylinder Head Assemblys are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These assemblies sit on top of the cylinder block and form the combustion chamber. Air and fuel enter the cylinder and exit as exhaust from the exhaust valves and travel to the exhaust manifold.GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

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• Sits on top of the cylinder block forming the combustion chamber
• Has ports for fuel and air mixture to travel to the inlet valves to enter the cylinder
• Has ports for the exhaust gases to travel from the exhaust valves to exhaust manifold
• 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