Air Flow Research Cylinder Head - Enforcer - Assembled - 2.020 / 1.600 in Valves - 195 cc Intake - 64 cc Chamber - 1.290 in Springs - Angle Plug - Aluminum - Small Block Chevy - Each-1006--Notes: 23-Degree????? Valve Angle , sold as Single Head State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO