Dart 13201113 Pro 1 Aluminum SB Ford Cylinder Heads Assembled (1 head)

Dart Pro 1 Cylinder Heads ports and chambers have been designed using Dart's sophisticated Wet Flow Technology for superior fuel atomization and airflow characteristics. Standard valve angle and spacing is retained for bolt on compatibility. Exhaust runners are raised .135" for improved flow. Manganese bronze valve guides are used for long life, and hardened valve seats provide durability with unleaded fuels. Dart Pro 1 Cylinder Heads feature premium alloy aluminum heads cast from virgin 355-T61 aerospace alloy for superior strength and integrity, bolt on compatibility, standard valve angle and spacing are retained accommodating all stock accessories, two intake port sizes, 170cc and 195cc cover applications from street cars to serious racing, raised exhaust runners, raised 0.135" for improved flow, heart shaped 62cc combustion chambers for improved combustion efficiency, multi-angle intake seats and radiused exhaust seats dramatically increased airflow, hardened exhaust seats are compatible with unleaded gasoline, manganese bronze valve guides for extended cylinder head life, exhaust flange uses the standard bolt pattern on as-cast heads.