Edelbrock AVS2 Dual Quad Annular Boosters 500 CFM Carburetor w/Electric Choke

Edelbrock is well-known for performance engine parts, and their AVS2 Series carburetors continue that tradition. This AVS2 500 CFM carburetor, part number 1903, is specifically calibrated for engines running a dual-quad setup, meaning two four-barrel carburetors. It uses Edelbrock's Annular Flow Booster technology, which is a notable step up from traditional down-leg boosters. Instead of just dumping fuel, these boosters have eight equally spaced orifices that refine fuel distribution, leading to much better fuel atomization.

What this means for you is improved drivability that feels almost like electronic fuel injection. You'll notice a complete elimination of flat spots and a significant improvement in throttle response, especially in the low- to mid-RPM range, without giving up any top-end power. The AVS2 design is also robust; it's unaffected by engine backfires because it doesn't use power valves that can blow out. Tuning is straightforward too. You can change metering rods and springs in seconds without removing the carburetor or draining the fuel, and the AVS2 is known for holding its tune, meaning your adjustments stay put for consistent performance.

The updated booster clusters are calibrated for today's fuels and octane levels. Plus, the unique Qwik-Tune Secondary Air Valve lets you fine-tune the secondary circuit with simple hand tools to match your specific application. The two-piece design makes adjustments to float levels or internal components easy, as you don't need to drain the fuel or remove the carb. This particular model, the 1903, comes with an electric choke for easier cold starts. All Edelbrock AVS2 carburetors are designed, manufactured, assembled, and calibrated in the USA.