Cast Iron Chevy Head Casting Marks



When it comes to Chevy heads, cast iron is a popular choice among car enthusiasts. Cast iron heads offer excellent durability and heat dissipation, making them ideal for high-performance engines. In this article, we will explore the different casting marks found on cast iron Chevy heads, providing you with valuable information for identifying and understanding these markings.

Identifying Casting Marks

Cast iron Chevy heads usually have casting marks that can help identify their origin and specifications. These marks are typically found on the top of the head near the valve cover area. The casting marks may include alphanumeric codes, logos, or symbols that represent specific head models or manufacturing details.

Common Casting Marks

One of the most common casting marks found on Chevy heads is the “GM” logo, which signifies General Motors. This indicates that the head was manufactured by GM. Additionally, alphanumeric codes like “462” or “882” are often present, representing specific head models. These codes can be cross-referenced with casting number databases to determine the head’s specifications.

Other Markings

Aside from the GM logo and alphanumeric codes, you may also come across other markings on cast iron Chevy heads. These markings can include dates, part numbers, or symbols that indicate additional manufacturing details. These markings are useful for identifying the exact production date and any specific modifications made during the manufacturing process.

Interpreting Casting Marks

Interpreting casting marks requires some knowledge of Chevy head casting history. By understanding the different casting marks and their significance, you can gather valuable information about the head’s specifications and potential performance characteristics.

Head Model and Specifications

The alphanumeric codes found on cast iron Chevy heads can provide information about the head model and specifications. By cross-referencing these codes with casting number databases or consulting automotive experts, you can determine the head’s combustion chamber size, valve sizes, and other critical specifications.

Manufacturing Details

Other markings, such as dates and part numbers, can reveal additional manufacturing details. Dates can help identify the manufacturing year, while part numbers can indicate specific modifications or upgrades made to the head during production. Understanding these details can be valuable when assessing the head’s suitability for your engine build.


Cast iron Chevy heads are widely used in high-performance engine builds due to their durability and heat dissipation capabilities. By familiarizing yourself with the casting marks found on these heads, you can gain valuable insights into their origin, specifications, and manufacturing details. Whether you are restoring a classic Chevy or building a modern performance engine, understanding casting marks can be crucial for achieving optimal results.

Remember, if you have any doubts or need more accurate information about specific casting marks, it’s always best to consult casting number databases or seek advice from automotive experts who specialize in Chevy heads.