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. Cam base circle is 0.040" smaller than OEM diameter. VVTi system must be deleted. Kelford Cams recommend KVS208 valve spring.