Lists of Chevrolet small- and big-block engine cylinder head casting numbers are available at OutInTheShop.com, GearHeadGeek.com and EngineLabs.com. The casting numbers are listed in numerical order and typically include details such as years of manufacture, intake and exhaust valve size, and any pertinent notes or unique identifying features.
For small- and big-block Chevrolet engines, MorTec.com provides descriptions and graphics that help identify the location of the cylinder head casting numbers. The location and meaning of identifying numbers has remained largely consistent over the history of Chevrolet's engine and cylinder casting program. Cylinder casting numbers and engine casting numbers are used as ways to identify vehicles and features.