Performance Carburetor 670CFM Street Avenger

The Performance Carburetor 670CFM Street Avenger by HOLLEY is purpose-built for street and strip enthusiasts seeking reliable fuel delivery in a compact, bolt-on package. This carburetor addresses the core challenge faced by engine builders and weekend warriors: achieving consistent air-fuel mixture across varied throttle conditions without sacrificing simplicity or cost. Whether you're tuning a carbureted V8, swapping a classic engine into a hot rod, or optimizing a street machine for daily driving, the Street Avenger delivers the metering precision and durability that professionals have trusted for decades.

The 670 CFM rating means this carburetor flows 670 cubic feet of air per minute at 1.5 inches of water column depression—a sweet spot for engines in the 350–425 cubic-inch displacement range at moderate RPM levels. HOLLEY's Street Avenger design incorporates dual inlet fuel ports for flexible fuel system plumbing, adjustable needle-and-seat fuel bowl regulators, and a straightforward vacuum secondaries system that responds naturally to engine load without hunting or stalling. The cast aluminum body resists heat soak while keeping total weight to just 10 pounds, and the compact footprint (11.25 × 7.85 × 12.45 inches) ensures clearance under tight hood lines typical of classic and modern vehicles alike. Internal passages are precisely tuned to deliver smooth transitions from idle to cruise to wide-open throttle, minimizing stumbles and hesitation.

Mechanics and engine builders favor the Street Avenger for street-driven applications where reliability and ease of tuning outweigh peak-horsepower competition-carb complexity. The fixed primary venturi design simplifies jetting—no power valve confusion or emulsion tube mysteries—making it ideal for DIY tuners and small shops. Installation requires a standard four-barrel carburetor mounting flange; existing intake manifolds, fuel lines, and vacuum hoses adapt readily with minimal modifications. This carburetor excels on naturally aspirated, carbureted engines from 2,500 to 6,500 RPM, providing excellent throttle response for both street cruising and occasional acceleration runs. For builders transitioning from single-barrel or two-barrel carburetors, or those seeking a no-nonsense fuel delivery solution for weekend performance driving, the HOLLEY 0-80670 delivers proven results without electronic complexity.