Honda S2000 Race Ported Cylinder Head F20C. Work carried out by BTCC Engineer Simon Erland with software calculations to maximise porting improvements. Inlet & Exhaust ports worked to maximise flow including the tough curve on the short side which must be correct to avoid the flow detaching; removing the guide and guide boss makes such a step change - because that messes up the flow as well as acts as a block. This head will flow substantially better than the cnc heads just because they leave the boss in and it has a disproportionate effect. Exhaust Studs Drilled & Tapped to M10 to avoid backing off in high performance high…