TB48DE Camshafts 223-D308 294 12. 10mm 11. 80mm Valve Lift 308 294 Stage 3 NA cams to suit extremely modified naturally aspirated drag racing engines. Suits engines with ported heads, bigger valves and high flow intake and exhaust system. Stroker bottom end with high compression pistons. Fuel type ethanol blend or methanol. Can retain NVCS N VCT variable intake cam timing with careful checking. Kelford Cams recommend KVS04 valve spring.