Edelbrock Cylinder Head - Performer RPM E-TEC 170 - Assembled - 1.940 / 1.550 in Valve - 170 cc Intake - 64 cc Chamber - 1.460 in Springs - Straight Plug - Aluminum - Small Block Chevy - Each-60975--Notes: State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO