The "P1" you mentioned is commonly associated with the McLaren P1, a high-performance hybrid sports car. However, it's important to note that the term "cc" (cubic centimeters) is typically used to measure the displacement of an internal combustion engine, whereas the McLaren P1 is a hybrid vehicle that combines a gasoline engine with an electric motor.
The McLaren P1 has a twin-turbocharged 3.8-liter V8 engine combined with an electric motor. The gasoline engine itself has a displacement of 3,799 cc (cubic centimeters) or 3.8 liters. The electric motor, however, does not have a displacement measurement in cubic centimeters since it doesn't have cylinders or pistons like an internal combustion engine.
So, to answer your question, the gasoline engine of the McLaren P1 has a displacement of 3,799 cc.