2007 Ford Shelby GT500

The most powerful factory-built Mustang ever just got even more potent. Final certification testing of the Shelby GT500's 5.4-litre supercharged V-8 shows it will produce 500 horsepower and 480 lb.-ft. of torque – 25 more horsepower than preliminary estimates.The Ford Shelby GT500's supercharged 5.4-litre, 32-valve V-8 is a result of Ford's experience in developing the modular V-8 and V-10 engine series. The engine is force-fed air via a "Roots-type" supercharger providing 9 pounds per square inch of boost. It borrows the four-valve cylinder heads, piston rings and bearings, from the Ford GT engine.