Dart 19674030 Pro 2 CNC Aluminum BB Chevy Cylinder Heads Bare (1 head)

Dart Pro 2 Cylinder Heads were designed to make competitive engine building easier and less expensive by incorporating the rugged features of Dart's famous Race Series casting into ready to use, professional quality competition cylinder head. Every intake port, exhaust runner, valve bowl, and combustion chamber is 100% digitally CNC machined for the ultimate in consistency. Dart Pro 2 Cylinder Heads feature premium alloy cast from virgin 355-T61 aerospace alloy for superior strength and integrity, bolt on compatibility, 2 degree rolled valve angle and standard spacing accommodating all stock accessories, 380cc intake runners are paired with 144cc exhaust ports to accommodate big-inch engines, intake valves are 2.300 inches, and the exhaust measure 1.880 inches in diameter, heart shaped 121cc chambers improve combustion efficiency, raised spark plug location improves flame travel for a quicker more complete burn producing more power, multi-angle intake seats are radiused exhaust seats dramatically increase airflow, hardened exhaust seats are compatible with unleaded gasoline, brass head bolt tubes are inserted between adjacent intake runners to allow the ports to be widened, spark plug holes are machined for gasketed 3/4" reach plugs, manganese bronze valve guides extend cylinder head life and reduce stem wear.