We developed two rectangular ports: a high velocity 308cc intake runner that produces incredible torque and a 345cc version that's perfect for big inch, high rpm Rat motors. The Iron Eagle's raised exhaust port outperforms its cast iron competition but still fits most standard headers.

Features:
- Valve angles rolled two degrees from stock to reduce chamber volume and improve flow.

- Bolt on compatibility: Standard valve angle and spacing are retained to allow use of off the shelf pistons and valve train components.

- Heart shaped chambers improve combustion efficiency.

- Hardened exhaust seats are compatible with unleaded gasoline.

- Multi-angle intake seats, radiused exhaust seats and precision cast valve bowls produce excellent air flow without hand porting or expensive CNC machining.

- Exhaust ports raised .300 to improve flow.

- Manganese bronze intake valve guides ensure long term reliability.

- Phosphorous bronze exhaust valve guides resist heat produced by low compression engines.

- All cylinder heads sold individually.