The powerplant is a two-stroke, Detroit Diesel 12V-71, meaning that it is a 12-cylinder motor with each cylinder displacing 71ci. That’s 852ci.
Those aren’t superchargers either. Being that this is a two stroke those blowers are just that, they are an integral part of the engine. Without them, there would be no scavenging in the cylinders and the engine would not run. The motor makes 500 hp and roughly 1,000 ft/lbs of torque.