MACE BARE CATHEDRAL PORT 243 CASTING CYLINDER HEAD TO SUIT HSV GRANGE WL WM LS2 6.0L V8Mace Bare cathedral port 243 casting cylinder head is manufactured from high quality aluminium casting. Their thin cross section allows for a high velocity and small volume runner design with excellent flow. This design provides excellent throttle response, torque and average power. This cylinder head provides excellent service and durability. Increased air flow provides large horse power gains in every application and better engine efficiency for