The 1966 Shelby 427 Cobra was famously powered by a monstrous 7.0-liter (427 cubic inch) Ford V8 engine, specially tuned for high performance. This big-block powerhouse delivered an impressive 425 to over 500 horsepower, depending on the setup, with massive torque that gave the lightweight Cobra blistering acceleration. Equipped with four-barrel carburetors and high-flow cylinder heads, the 427 engine turned the Cobra into a legendary American muscle and racing icon.