HKS - Intake,Exhaust Cam Pulley - Nissan - SR20DET ( RWD Intake Only, FWD Intake and Exhaust)Specifications: Manufacturer: HKS Reference Number: 2203 RN009 As cam duration and other engine specifications changes, the ideal valve timing point will also change. As both intake and exhaust cam duration increase, the overlap amounts can be adjusted for optimum performance. All HKS Camshafts come with recommended valve timing which can be achieved by using these sprockets in conjunction with HKS camshafts. These sprockets are compatible with