Air Flow Research Cylinder Head - Magnum Comp - Assembled - 2.250 / 1.880 in Valves - 305 cc Intake - 117 cc Chamber - 1.625 in Springs - Angle Plug - Aluminum - Big Block Chevy - Pair-2100--Notes: Retangle Port, Partially CNC State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO