Dart 13072040 Pro 1 CNC Aluminum SB Ford Cylinder Heads Bare (1 head)

Dart Pro 1 CNC Heads for Ford small blocks are professional quality competition cylinder heads. Dart applied the airflow technology developed in their championship winning Pro Stock engine program to produce these state of the art heads. Every intake port, every exhaust runner, every valve bowl, and every combustion chamber is 100% CNC machined on special dedicated Pro 1 castings. These heads are ideal for high compression, big inch small clocks and are great for supercharged applications. Dart Pro 1 CNC Heads also feature premium alloy cast from virgin 355-T61 aerospace alloy for superior strength, bolt on compatibility, standard valve angle and spacing are retained accommodating all stock accessories, fully CNC machined 210cc or 225cc intake ports produce superior air flow and fuel suspension characteristics, 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 increase airflow, hardened exhaust seats are compatible with unleaded gasoline, manganese bronze valve guides for extended cylinder head life, exhaust flange uses the spread bolt pattern (1 inch wider than stock) to accommodate large diameter header tubes.