An assortment of calibration parts for race track tuning including: 4 pairs (#350-1992) or 6 pairs (#350-1991) of primary metering rods, 5 pairs of main metering jets, 5 pairs of secondary metering rods, 5 secondary metering rod hangers, high capacity .145'' diameter needle and seat assembly, high-performance accelerator pump and 4 power piston springs.