During the muscle car era of the 1960s, high horsepower V8 engines ruled the streets. One of the most popular choices was General Motors' small block V8. Throughout the over five decades since then this platform has been tweaked and improved to offer maximum power and efficiency. Today, it's the chosen power plant for the Corvette, Camaro and Cadillac CTS-V. It's also the heart and soul of Seven Marine's 557-horsepower outboard. If you've never heard a 557 running in person, turn up your speakers, play the video below and get ready for an adrenaline boost.