Brian Crower Valves are made from premium stainless steel, fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head. PartNumber : BC3321 Description : Valves; Set of 12 Position : Exhaust Size : 27.5mm 1986-1992 Toyota Supra Base L6.2954cc Engine Components::Valves 1987-1992 Toyota Supra Turbo L6.2954cc Engine Components::Valves