Dart 18° aluminum small block heads offer a dramatic improvement over conventional 23° heads. By reducing the valve angle, reshaping the intake ports, and optimizing the combustion chambers, they produced a significant increase in both airflow and combustion efficiency ... and that means power. Bare heads feature 237cc intake ports with 67cc as cast chambers. Fully CNC machined heads feature 257cc intake and 108cc exhaust ports and combustion chambers are CNC machined to a 4.155 bore. Include valves, 1.550" Double springs.

Prices per head.