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The Circle Track 500 CFM 2G begins with a .130 needle and seat assembly for adequate fuel supply and a small diameter float for maximum float bowl volume. The cluster is modified based on engine and vehicle specs to keep the fuel curve correct throughout the RPM range. Idle, transition and accelerator pump circuits are modified to application. Tapped to accept Holley jets for ease of tuning and finished with a 3/8" fuel inlet. Note: This 2G is modified to 500 CFM from a smaller core. The casing ridge has been removed but it will pass a gauge test. Venture size: 1 3/8", Bore size: 1 11/16".