Dart designed the PRO 1 to be the best out -of-the-box head on the market. No need for porting or CNC work of any kind ... But what if you did!!! Dart now offers this same technology in a special casting that is fully CNC ported. With 355cc intake runners and an exhaust runner of 138cc. Fully assembled by the head experts at Dart. Assemblies include valves, 1.625" double valve springs, retainers, 10° locks, guide plates and studs.

Prices per head.