What is the largest Pontiac engine?

The largest Pontiac engine ever produced was the 455 cubic-inch V8 engine. It was first introduced in 1970 and was used in a variety of Pontiac models, including the GTO, Trans Am, and Grand Prix. The 455 engine produced 366 horsepower and 484 pound-feet of torque. It was the largest engine ever offered by Pontiac and is still considered to be one of the most powerful engines ever produced by an American automaker.