Thunder Series AVS 500 CFM Carburetor with Electric Choke, Satin Finish

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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 stays unchanged. The third characteristic is the primary and secondary booster clusters that are utilized offer the most accurate and up-to-date calibration available for today's fuels and octane levels. Fourth the unique Thunder Series' Qwik-Tune Secondary Air Valve allows for limitless calibration of the secondary circuit with simple hand tools while on your vehicle. It's quick. It's simple. It's effective. It can be easily adjusted - in seconds - to suit your application... no extra parts required to achieve optimum performance. Simply put the Edelbrock 1803 Thunder Series AVS 500 CFM electric choke carburetor is undeniably the most innovative and dependable street performance carburetor available today.

Documents & Installation Notes



Availability Available
Application Universal
GTIN 00085347018031
Availability Note Available to Order
Warranty 12 Months
Emissions Code
Hazardous Materials Warning WARNING: This product can expose you to Zinc, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit
Installation Notes
  • Carbs #1803, #1804 and #18034, #18044 are calibrated for dual-quad applications only and need to be purchased together, one manual and one electric choke
  • Recommended cubic inch displacement for small block dual quad applications is 302-400+ c.i.d.
  • Thunder Series AVS Carbs will work with Ford automatic overdrive trans (AOD) when used with Lokar bracket SRK-4000
Body Color Satin Finish
Choke Type Electric
Marine Approved No
Maximum Flow Rating 500 cfm
Primary Jet Diameter 0.086 in