Free Shipping on all orders over $50* Learn More

AVS2 500 CFM #1903 Carburetor with Electric Choke for Dual-Quad

Edelbrock's Annular Flow Boosters brings superior fuel atomization to all dual-quad applications with the AVS2 500 CFM Carburetor #1903 specially calibrated for engines running two four-barrels. Single-carb AVS2 also available (1901/1902).
In stock
Edelbrock's Annular Flow Booster technology brings superior fuel atomization to all dual-quad applications with the AVS2 500 CFM Carburetor #1903 that is specially calibrated for engines running two four-barrels. Annular Flow Boosters deliver near EFI-like drivability that you can feel as soon as you step on the gas. Fuel distribution is refined by eight equally spaced orifices in the booster rings that replace down-leg boosters which simply dump raw fuel into the venturi. Flat spots are completely eliminated, and throttle response in the low- to mid-RPM range is improved tremendously with no sacrificing of that top-end power that Edelbrock is known for. The AVS2 is unaffected by engine backfires since there are no power valves to blow out. For fast and simple part-throttle tuning, metering rods and springs can be changed in seconds without carburetor removal or fuel draining. AVS2 carbs have the unique ability to "hold a tune” when compared to other carburetors. Your tuning and adjustments stay unchanged, so performance remains consistent. Updated primary and secondary booster clusters in the AVS2 offer the most accurate and up-to-date calibration available for today's fuels and octane levels. Additionally, the unique Qwik-Tune Secondary Air Valve allows for limitless calibration of the secondary circuit. Adjustments can be with simple hand tools in seconds to suit your application. The AVS2 features a two-piece ease-of-tuning design that lets you make float level adjustments or replace internal components without draining the fuel from the carburetor or removing it from the engine. The AVS2 500 CFM carburetor is available with electric (#1903) or manual (#1904) choke in satin or EnduraShine finish. For small-cubic-inch single carburetor engines, order the specially calibrated AVS2 500 CFM #1901 (electric choke) or #1902 (manual choke). Like all Edelbrock carburetors, the AVS2 Series is designed, manufactured, assembled and calibrated by Edelbrock in the USA.
More Information
Manufacturer Edelbrock
Application Universal
UPC 00085347019038
Recommended Use For Dual-Quad Applications
Series AVS2
Condition New
Metering Rod Size .070 x .052 in
Mounting Hole Quantity 8
Grade Type Performance
Gasket Or Seal Included Yes
Mounting Hole Diameter 0.355 in
Barrel Quantity 4 Barrel
Flange Type Square
Street Legal No
Secondary Jet Diameter 0.077
Small Venturi Diameter 1.630 in
Body Material Aluminum
Main Venturi Diameter 1.19
Body Height 3.25
Spacer Included No
Metering Rod Length .070 in
Bore Diameter Primary Bore 1.44; Secondary Bore 1.6875
Spring Force 5" Hg (Orange)
Availability Note Available to Order
Warranty 12 Months
Emissions Code
Hazardous Materials Warning WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit
Installation Notes
  • Manual choke AVS2 Carbs cannot be converted to electric choke. Carbs #1903, #1904 and #19034, #19044 are calibrated for dual-quad applications only and need to be purchased together, one manual and one electric. For single carb small-displacement engines and Street Tunnel Ram applications use carbs #1901, #1902, #19014 and #19024.
Choke Type Electric
Finish Satin
Marine Approved No
Material Aluminum
CFM Rating 500 cfm
Primary Jet Diameter 0.095
Write Your Own Review
You're reviewing:AVS2 500 CFM #1903 Carburetor with Electric Choke for Dual-Quad