Designing engines with more horsepower often comes at the price of more fuel. However, some American-made engines stand out for their remarkable power density, churning out optimum horsepower per liter. These engines exemplify advanced engineering techniques, producing remarkable power outputs that underscore their manufacturers’ commitment to performance and efficiency.

Chevrolet Corvette Z06 – 5.5L V8, 670 hp (121.8 hp/liter)

The Chevrolet Corvette Z06’s naturally aspirated engine achieves massive yield through modernized engineering techniques, including a flat-plane crankshaft, dual overhead cams, and a high-revving design that peaks at 8,600 RPM. Typically found in exotic European sports cars, the qualities allow the Corvette Z06 to emerge in the competitive high-performance market.

Ford GT – 3.5L V6, 660 hp (188.6 hp/liter)

With about 188.6 horsepower per liter, the Ford GT’s V6 engine embodies cutting-edge technology. It has direct fuel injection that enhances both power delivery and efficiency. This setup catapults the GT to extreme speeds and ensures responsive driving. The engine combines improved aerodynamics and a lightweight carbon fiber chassis, setting a benchmark for high-performance cars worldwide.

Cadillac CT5-V Blackwing – 6.2L V8, 668 hp (107.7 hp/liter)

The Cadillac CT5-V Blackwing stands out among American supercars for its 6.2-liter supercharged V8 engine. Achieving an outstanding 107.7 horsepower per liter, this powerplant features a supercharger that enhances low-end torque and engine responsiveness. Besides raw power, the Blackwing’s V8 engine is celebrated for its smooth power delivery across the RPM range.

Dodge Challenger SRT Demon 170 – 6.2L V8, 1025 hp (165.3 hp/liter)

A monstrous 6.2-liter V8 engine propels the Dodge Challenger SRT Demon 170 with an astounding 1025 horsepower. Engineered for high-performance driving, the supercharged V8 is meticulously tuned to optimize every drop of fuel. Innovations like improved cooling systems and reinforced components help the engine withstand extreme conditions.

Hennessey Venom F5 – 6.6L V8, 1817 hp (275.3 hp/liter)

The 6.6L V8 engine that powers the Venom F5 employs forged aluminum pistons and forged steel connecting rods, meticulously crafted to withstand the immense forces generated within each cylinder. Its engine optimizes power delivery and efficiency using a dual overhead camshaft (DOHC) configuration with variable valve timing (VVT). High-flow intake and exhaust ports ensure maximum airflow, which is necessary for achieving the maximum output.

SSC Tuatara – 5.9L V8, 1750 hp (296.6 hp/liter)

A 5.9-liter V8 engine, renowned for its exceptional power of 1750 horsepower, powers the SSC Tuatara. The powerhouse has a robust block forged from high-strength aluminum alloy, capable of withstanding extreme pressures and temperatures. Included in the internal components are lightweight forged pistons that move within the cylinders and dual overhead camshafts (DOHC) per cylinder bank.

Chevrolet Camaro ZL1 – 6.2L V8, 650 hp (104.8 hp/liter)

Unique qualities of the  Camaro ZL1’s V8 engine include dual overhead camshafts (DOHC) or single overhead camshaft (SOHC) configurations, variable valve timing (VVT), and cylinder deactivation technology for improved fuel efficiency. To support its massive horsepower, the engine is complemented by a forced induction setup paired with an intercooler to cool the compressed air before it gets into the engine.

Shelby GT500 – 5.2L V8, 760 hp (146.2 hp/liter)

Key to the Shelby GT500’s exceptional power is the supercharger setup, either a Roots-type or similar design, which pressurizes the intake air to increase efficiency significantly. This quality allows the engine to deliver ample torque and horsepower, optimizing acceleration and top-end output. Internally, the GT500’s V8 contains forged pistons, reinforced connecting rods, and a high-performance crankshaft.

Dodge Charger SRT Hellcat Redeye – 6.2L V8, 797 hp (128.6 hp/liter)

By incorporating a large displacement, the Dodge Charger SRT Hellcat Redeye’s engine allows sufficient air intake to generate significant power. The vehicle utilizes futuristic engine management systems and fuel supply mechanisms to achieve massive power while maintaining efficiency. These include precise electronic controls that optimize the air-fuel mixture and ignition timing for maximum combustion efficiency. 

Cadillac CT4-V Blackwing – 3.6L V6, 472 hp (131.1 hp/liter)

This twin-turbocharged V6 power plant produces an impressive 472 horsepower and 445 lb-ft of torque, achieving a remarkable 131.1 horsepower per liter. It features an advanced twin-turbo setup that ensures minimal lag and maximizes power across the entire RPM range. In addition, the engine utilizes an external engine oil cooler and high-flow radiator to maintain optimal temperatures.

Dodge Durango SRT Hellcat – 6.2L V8, 710 hp (114.5 hp/liter)

The Dodge Durango SRT Hellcat’s supercharged engine produces about 710 horsepower and 645 lb-ft of torque. The supercharger is a vital component, featuring a twin-screw design and operating at up to 14,600 rpm. It is mated to an efficient cooling unit and employs high-flow fuel injection and reliable oiling systems.

Chevrolet Corvette Stingray –6.2L V8, 495 hp (79.8 hp/liter)

Also known as the LT2, the Chevrolet Corvette Stingray’s naturally aspirated engine produces an impressive 495 horsepower and 470 lb-ft of torque when fitted with the performance exhaust. One key feature of the LT2 is its dry-sump oil system, which ensures consistent oil flow even during speedy cornering. Additionally, the engine is placed in a mid-engine layout to optimize the car’s weight distribution.

Ford Mustang Mach 1 – 5.0L V8, 480 hp (96 hp/liter)

Key to this engine’s yield is the incorporation of various highly tuned components, such as the open-air induction system and a specially calibrated intake manifold. These features enhance airflow and combustion efficiency, ensuring the engine breathes freely and operates at peak power. Furthermore, the engine benefits from upgraded cooling systems, including a dedicated engine oil cooler and a rear axle cooling feature.

Jeep Grand Cherokee Trackhawk – 6.2L V8, 707 hp (114.1 hp/liter)

The Jeep Grand Cherokee Trackhawk’s 6.2L V8 engine is the same Hellcat engine found in Dodge’s muscle cars, but it has been fine-tuned for the Trackhawk. Its supercharger provides instantaneous power, while reinforced internals and advanced cooling systems ensure the engine can handle immense stress. The Trackhawk’s engine combines an eight-speed automatic transmission and an all-wheel-drive unit.

Saleen S7 – 7.0L V8, 750 hp (107.1 hp/liter)

With its twin-turbocharging system, the Saleen S7 engine’s output peaks at an impressive 750 horsepower and 700 lb-ft of torque. This engine employs a robust aluminum construction for the block and cylinder heads, ensuring a lightweight yet solid foundation. Moreover, it incorporates a dry-sump oiling unit, which helps maintain optimal lubrication and output at top speeds.