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LARGER DISPLACEMENT TURBOCHARGED CAMSHAFT, 243/251 117+5 This cam has run 4.50's in a single turbo 388, it has also run 4.50's @ 160 in a twin turbo 427, which is at the top of what a hydraulic roller cam has ever run in a 3000 lb door car. If you have enough turbo/turbine capacity, this is the cam for you. Literally the fastest hydraulic roller camshaft for an LS available today. If you are building a 388 to 427 inch cathedral headed LS with medium sized twins or a big single like a GT55 Garrett or Promod. This cam will give you proven performance and reliability for your application.