In 1964, Pontiac broke a GM rule by putting an engine larger than 330 cubic inches engine into a LeMans and created the muscle car as we know it today. The big 389 was good for 325 hp, 348 in Tri-Power guise. Putting big engines in little cars became the American way and gave birth to several iconic muscle cars in the 1960s and 70s.

Maximum airflow and more efficient cooling at low speeds and in the most extreme of conditions, when and where it's needed most.