282/276° NZ superstock stage 1 naturally aspirated racing cams to suit engines making around 450hp. Designed to suit engines built to Speedway NZ rules, 10:1 compression ratio. Cylinder head needs machining for clearance around bucket bores for high lift cam lobes. Requires valve spring upgrade and retainer to seal clearance modification. 0.040" smaller than OEM base circle diameter, 33mm base circle diameter. VVTi system must be deleted.