290/290 | 10.60mm/10.20mm Valve Lift – 290 drag racing cams for wide open throttle and high rpm power. Suits engines running 72mm+ turbocharger. Ideal for alcohol based fuels. Designed to keep the valvetrain stable even on stock buckets. Cylinder head may require machining for clearance of high lift cam lobes. Kelford Cams recommend KVS109-1JZ-T valve spring.