DART’s CNC Ported Honda GSX Heads are based on factory new GS-R VTEC castings, and are given a full digital CNC porting and combustion chamber reshaping. Dart’s GSR CNC Heads provide serious street or racing performance with optimized air flow, fuel atomization and combustion characteristics. Our extensive racing experience has been applied to produce a Honda head which increases power and performance dramatically. Ideal for turobcharged or nitrous oxide injected engines using Dart’s B-18 , B-20+ or stock Honda blocks. Digital CNC porting and combustion chamber machining provides dimentionally accurate and consistent contours which translate into reliable power output.