Look for a casting number (it may or may not be the same as the serial number; the casting number identifies the block itself), and a separate serial number that identifies the specific engine. It might be stamped into a relatively flat area of the block, sometimes near or on the pad where the distributor is mounted. It can be difficult to read due to age, grime, and wear.
To be certain:
* Clean the area: Use a wire brush or degreaser to clean the suspected area.
* Use a flashlight: A strong light will help you see faint markings.
* Consult a Chevy small-block identification guide: Many online resources and books provide pictures and detailed descriptions of serial number locations for various years. Knowing the approximate year of your engine will significantly narrow your search.
Remember, the serial number might be partially or completely worn away depending on the engine's age and condition.
