800CFM Thunder Series AVS Carburetor w/E/C

The 800CFM Thunder Series AVS Carburetor w/E/C from Edelbrock is a purpose-built performance fuel delivery system engineered for street and strip applications where reliable mid-range power and throttle response matter. This carburetor is designed for enthusiasts and professional builders who demand precise fuel metering without electronic fuel injection complexity. Whether you're tuning a classic muscle car, hot rod, or modern retro build, this carb delivers the mechanical simplicity and predictable performance that experienced mechanics trust for naturally aspirated engine builds.

At 800 cubic feet per minute (CFM) capacity, this carburetor is optimized for mid-sized displacement engines, typically in the 350–400 cubic inch range, where it provides enough fuel volume for peak power without sacrificing throttle precision or part-throttle driveability. The AVS (Air Valve Secondary) design automatically responds to engine load, opening the secondary venturi stage progressively as demand increases—eliminating the bog and hesitation common with mechanical-secondary designs. The included electric choke (E/C) ensures reliable cold-start enrichment and faster warm-up cycles, reducing cranking time and improving initial drivability while the four-barrel configuration with dual floats maintains stable fuel pressure across varying throttle inputs and G-forces during cornering or acceleration events.

Ideal for carbureted engine swaps, vintage restoration projects, and performance builds where traditional port fuel injection isn't desired, this unit excels on non-computer-controlled platforms and in environments where fuel volatility or extreme temperatures challenge modern electronics. Installation requires standard carburetor mounting (verify intake manifold compatibility and fuel line sizing), and the compact 7.4 x 6.7 x 13.65 inch envelope fits most hood clearances on street applications. Tuning is straightforward for builders familiar with jet selection, needle seat height, and air-fuel ratio optimization—making this carb a reliable workhorse for anyone serious about mechanical fuel metering and repeatable engine performance.