Similar to the Stage 3 head, this fully developed CNC ported head has excellent flow that makes huge improvements required for large displacement M8 engines. This design has improved velocity helps make excellent early torque and peak HP.

For use on big bore M8 engines. O.S. valves sizes + 1.5mm intake 41.5/33 +1mm exhaust. Requires O.S. Induction

This work is performed on your supplied head cores.