Dart BB-Chevy Pro 2 Aluminum 380cc Heads

Dart's Pro 2 380cc heads are the next evolution of their big block Chevy lineup. As engine displacements continually get bigger, they saw the need for a larger conventional-style cylinder head to extract the maximum performance from these huge motors.

The Pro 2 cylinder heads were designed to make competitive engine building easier and less expensive by incorporating the rugged features of their famous Race Series casting into a ready-to-use, professional quality competition cylinder head. Every intake port, every exhaust runner, every valve bowl, and every combustion chamber is 100% digitally CNC-machined for the ultimate in consistency.

The Pro 2 head's 380cc intake runners are paired with 144cc exhaust ports. Intake valves are 2.300", and exhaust valves measure 1.880". Brass head bolt tubes are inserted between adjacent intake runners to allow the ports to be widened. The high-velocity raised exhaust ports are modeled on their own Pro Stock heads using airflow concepts that dramatically improve cylinder scavenging and the engine's ability to accelerate quickly. Multi-angle intake valve seats direct the air-fuel mixture into the chamber like an airfoil, reducing turbulence and preventing fuel separation. Fully radiused exhaust seats provide the smoothest possible transition into the ports for hot exhaust gases.