Where is the serial number on a Chevy 350 block?

The serial number on a Chevy 350 small-block engine isn't located on the block itself in the same way a VIN is on a car's body. Instead, the casting number is what identifies the block. This number is usually found on the front passenger's side of the block, near the bellhousing, although its exact location can vary slightly depending on the year and casting.

It's crucial to understand the difference: The casting number identifies the block's specifications (like year of manufacture, features, etc.), while a serial number uniquely identifies *an individual engine*. Chevy small-block engines didn't generally receive unique serial numbers stamped on the block itself. To trace a particular engine's history, you'd need additional information, possibly found on the engine's pad (if present) or from other sources like original documentation.