The long awaited SpeedCircuit Heads for the 4B11 Evo X are now available! All SpeedCircuit heads are completely stripped down and rebuilt, including new parts where necessary. There are 3 stages of heads available.
Stage 1 includes:
- Valve job
- Bowl work to blend the stock machine cuts into a larger bowl
- Resurface (if needed)
- Sandblast clean
- Valve lash set
- Pressure tested to ensure no leaks
Stage 2 includes all of the above, as well as:
- Completely ported and knife-edged intake ports
- Completely ported and knife-edged exhaust ports
- The extra porting and knife edging results in a larger port that is more consistent than the stock port, resulting in smoother power and better airflow.
Order will not be shipped until shipping is paid in full. This item is custom made to order, and therefore is not returnable. Please allow 3-7 weeks for delivery.