A 1983 El Camino (V6 or otherwise) will require a
Group 65 battery. However, you might find slightly larger or smaller group sizes (like Group 78) will also physically fit, but you'll want to confirm dimensions before purchasing to ensure a proper fit in the tray. Always check your owner's manual for the officially recommended battery group size, as there may have been variations based on options.
Beyond the group size, ensure the battery has the correct CCA (Cold Cranking Amps) rating for your vehicle. A lower CCA rating might struggle to start the engine, especially in cold weather. Your owner's manual or the sticker on your existing battery will provide the recommended CCA rating.
