Dart designed Iron Eagle big-block heads for street performance, bracket racing, oval track competition, tractor pulling, and high-performance marine applications.ξDart developed two rectangular ports: a high-velocity 308cc intake runner that produces incredible
torque and a 345cc version thatäó»s perfect for big-inch, high-rpm Rat motors.
The Iron Eagleäó»s raised exhaust port outperforms its cast-iron competition but still fits most standard headers

Using proprietary Speed-Flow(tm)technology, Dart has developed more efficient port designs with improved velocity and flow capabilities.

Computerized modeling and physical testing have been employed to produce the premier cast iron cylinder head on the market today.

The combustion chamber has been redesigned for greater breathing characteristics and more controllable combustion.