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 will appreciate the straightforward installation and tuning process, making it an ideal choice for both novice and experienced users. The Performance Carburetor 670CFM Street Avenger is designed to enhance performance and reliability, making it a valuable addition to any performance engine setup.