282°/286° high lift racing cams to suit engines running alcohol based fuels and 72mm+ turbo. Improved throttle response when using VVT-i.These high velocity cams require a shimless bucket or shim-under bucket conversion, such as the DLC coated bucket KCF-202. Cylinder head may require machining for clearance of high lift cam lobes. Kelford Cams recommend valve spring KVS102-BT.