1 BRAND NEW SB2 CNC Ported Cylinder Head. Head has beryllium copper seats. Head has 11/32" Bronze guides. Valves used for flow bench testing were 2.15" Intake and 1.625" Exhaust. Date of manufacture is 5/1995. Please see the attached photo of the flow sheet to get an idea of how amazing these heads were and still are. If you need 1, it's your lucky day!