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Supercharged engines thrive on airflow, so we went with Dart Pro1 CNC heads (PN 11071142). These 250cc heads will flow a boatload of air and their 68cc chamber volume works to hit our compression goal. The heads feature multi-angle intake seats and radiused exhaust seats to enhance air flow in addition to the large 2.08 intake and 1.60 exhaust valves. The fact that they came fully assembled with 1.290 beehive springs made our lives that much easier.