AFR 305 BBC "As Cast" Rectangle Port Magnum Heads

Air Flow Research 305 Rectangle Port "Magnum" BBC 24° AFR’s Torque Monster These AFR 305cc rectangle port cylinder heads feature partially CNC ported intake, exhaust & chambers. Manufactured from A356 aluminum castings and premium quality valvetrain components throughout. Recommended for moderate street, or street/strip builds with displacements up to 509 cubic inches operating up to 6500 RPM. Also available with 100% CNC chambers for increased air flow (see chart). Component upgrades and machining options are available to customize AFR Heads to your specific build. These heads may have the smallest intake runner volume in AFR's lineup, but don't let their size fool you. These AFR Magnum 305cc "as-cast" heads with a CNC bowl blend will provide you with flow numbers that most medium sized heads and some larger, can only dream about. This line was designed to optimize low and mid-lift airflow, while still generating impressive peak figures. Their application should be focused on s