How do you identify small block Chevy heads by the symbols on end?

Identifying small-block Chevy heads by the casting numbers stamped on the end is the most reliable method. There aren't consistent symbols used across all heads to quickly identify them; the casting numbers themselves are the key. These numbers are usually found on the passenger side (right side) of the head, near the end, but sometimes can be on the driver's side.

You won't reliably identify a small-block Chevy head based on *symbols* alone. While some heads *might* have a small symbol or letter cast into them alongside the number, it's not a standardized system for identification. The casting number itself tells you everything you need to know about the head, including its specifications (e.g., chamber size, valve size, bolt pattern).

To identify the head:

1. Find the Casting Number: Clean the area if necessary to see the number clearly. It's usually a sequence of numbers, and sometimes includes letters.

2. Use a Reference Guide: There are many online resources and books that list the casting numbers and corresponding specifications for small-block Chevy heads. A simple Google search of "small block Chevy head casting numbers" will provide several such references.

3. Cross-reference the Information: Once you have the casting number, look it up in your reference to determine the head's specifications.

In short: Focus on the casting number, not symbols, for reliable identification of small-block Chevy heads.