The Edelbrock 1803 Thunder Series AVS 500 CFM electric choke carburetor has been designed and calibrated to deliver optimum street performance in dual-quad applications. Several characteristics make the 1803 Thunder Series AVS 500 CFM electric choke carburetor an outstanding street performer. The first one is that metering rods are utilized to transition between circuits. The carburetor is unaffected by engine backfires, which means that there are no power valves to blow out, and the rods can be changed in seconds without carburetor removal or fuel draining. Secondly, the carburetor has the unique ability to hold a tune, so once it is tuned, the carburetor stay's tuned. What this means to you is that compared to other carburetors, the performance remains consistent and the calibration stay
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