Here's how:
* Check the Vehicle Identification Number (VIN): The VIN contains coded information about the car's specifications, including the engine. The VIN is typically located on the dashboard, visible through the windshield. You can decode the VIN using online tools or resources specific to 1963 Chevy vehicles. This is the most reliable method.
* Look for Engine Identification Numbers: The engine itself will have an identification number stamped on it. This number can be used to determine the exact engine size and type. The location of the engine ID number varies depending on the engine, but it's usually on a visible surface of the engine block.
* Check the Owner's Manual (if available): If you have the original owner's manual, it should specify the engine size.
* Examine the Build Sheet (if available): A build sheet (sometimes called a "tank sticker") documents the specific options and components of the car during its manufacture. These are rare to find, but if you have one, it will definitively state the engine.
* Check Previous Ownership Records: If you have any paperwork from previous owners, it might mention the engine size.
Without one of these sources, you can only guess. Common engine sizes in 1963 Chevy Impalas included 230 cubic inch straight-six, 283 cubic inch small-block V8, 327 cubic inch small-block V8, and 409 cubic inch big-block V8. But there's no way to know which was installed without checking the car itself or its documentation.