* The VIN (Vehicle Identification Number): The VIN plate, usually located on the dashboard or doorjamb, will contain a code that designates the engine. You'll need a 1965 Dodge Coronet decoder to translate this code into the specific engine displacement (e.g., 273 cubic inches, 318 cubic inches, 383 cubic inches, 413 cubic inches, or 426 cubic inches). Many online resources offer these decoders.
* Engine Block Casting Number: This number is cast directly into the engine block itself. You'll likely need to remove some components for a clear view. Again, you'll need a reference guide or online database to translate this casting number into the engine displacement.
* The Owner's Manual (if available): The original owner's manual would clearly state the engine size.
* Build Sheet (if available): If the car is a particularly well-preserved example, a build sheet (factory documentation specifying the car's options and specifications) might still be present. This would definitively state the engine.
In short, you can't just glance at the engine bay and see the engine size. You must consult either the VIN decoder, the engine casting number along with a reference, or original documentation.
