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The Edelbrock Thunder Series AVS Carburetor Calibration Kit is designed to tune cars to match any engine or track condition. This kit includes an assortment of metering rods and jets, a pair of metering rod retaining springs, and a complete assortment of step-up springs. This calibration kit is used to customize the Performer carburetor. This carburetor calibration kit is for Thunder Series carburetors which are designed and calibrated to deliver optimum street performance in hundreds of applications.