Dart PRO 1 CNC heads are professional quality competition cylinder heads. Every intake port, exhaust runner, valve bowl, and combustion chamber is 100% CNC machined on special dedicated PRO 1 castings. CNC machined 227cc intake ports give you optimized flow characteristics out of the box. Our 5-axis machining centers precisely duplicate the port profiles so that every head delivers awesome performance. CNC machined combustion chambers ensure that every chamber has the same volume so that every cylinder has equal compression.The valve seats are machined, not ground, to produce precise angles and radiuses for maximum airflow.

Price per head.