Dart Chevy Big Block Pro1 Bare Cylinder Head - 227Cc Port / 66Cc Chamber

Dart Pro1 CNC Aluminum Big Block Chevy Cylinder Heads are engineered for maximum performance and full competition, making them the top choice for unlimited oval racing and super classes. Designed for 400+ cubic inch engines running 7,000+ RPM, these heads are built to handle the extreme demands of professional-grade racing.

The Dart Pro1 23-degree 227cc CNC heads utilize cutting-edge airflow technology derived from Dart’s championship-winning Pro Stock engine program. Every intake port, exhaust runner, valve bowl, and combustion chamber is meticulously 100% CNC-machined on specially dedicated Pro1 castings, ensuring optimal airflow and maximum efficiency. These heads are ideal for high-compression, large cubic inch big blocks and perform exceptionally well in supercharged applications.

Retaining standard valve angles and spacing allows for easy compatibility with off-the-shelf pistons and valvetrain components, making assembly straightforward while delivering peak performance. Hardened exhaust seats are designed to work with unleaded gasoline, and manganese bronze valve guides ensure durability, extending the life of the cylinder heads. Sold individually, Dart Pro1 CNC Aluminum Big Block Chevy Cylinder Heads set the standard for competitive, high-performance engine builds.