Performer Carburetor600 CFMElectric ChokeNon-EGRBlack Powder Coated Finish CALIBRATED FOR FUEL ECONOMYDesigned for small-block and small displacement big-block engines, these carbs are recommended only for stock to Performer level applications. They are not recommended for use on RPM or Torker II intake manifolds. Match with an Edelbrock Performer or Performer EPS manifold or other brands of similar design. NotesCalibrated 2 leaner than #350-1405 for maximum fuel economyRecommended for most Performer applicationsHas timed and full vacuum ports for ignition advanceMetering Jets: Primary .098 , Secondary .095 Metering Rods: .075 x .047 Step Up Spring: Yellow 4" HgEmissions Note:This part is only legal for.