|Holley's Street Avenger 4-barrel carbs give you trouble-free performance in a good-looking, easy-to-install package. They're calibrated to give you the performance you need, without the tuning headaches involved with other carbs. Features include a tunable metering system, fuel filters in the primary and secondary fuel bowls, center-hung floats, external float adjustments with sight plugs, an electric choke, emissions accessory ports, adjustable secondaries, a power-valve saver, dual-feed conversion fuel line, and more. All of this comes with a silver finish that looks as good as it performs! They're available in many different sizes for a variety of engines.