A 4.0-liter V8 engine is a type of internal combustion engine that features eight cylinders arranged in a V configuration. The "4.0-liter" designation refers to the engine's displacement, which is the total volume of all the cylinders combined. This engine size is commonly found in high-performance vehicles, providing a balance of power and efficiency. V8 engines are known for their smooth operation and strong torque delivery, making them popular in sports cars and trucks. They typically produce more horsepower than smaller engines, allowing for faster acceleration and improved towing capacity. Brands like Ford and Chevrolet often utilize V8 engines in their performance models.