Carburetor - 670CFM Ultra Street Avenger

The Holley Carburetor - 670 CFM Ultra Street Avenger Model 4150 is a 4-barrel square-bore carburetor designed for street and light performance applications that require precise fuel metering and reliable cold-start capability. This carburetor is ideal for mid-range displacement engines, providing a balance of responsive acceleration and good idle quality.

With a flow capacity of 670 cubic feet per minute (CFM), the Ultra Street Avenger features a vacuum secondary design that meters fuel based on intake manifold depression, reducing over-enrichment during partial-load operation. The electric choke ensures consistent cold-start enrichment, regardless of ambient temperature or engine coolant lag. Its black anodized aluminum construction resists corrosion, while the tumble-polished finish maintains its appearance across various climate conditions.

This carburetor is particularly beneficial for owners performing engine rebuilds, carburetor restorations, or swaps on small-block to mid-sized engines. Its reputation for consistent fuel delivery and reliability makes it a great choice for street-driven vehicles where usability is prioritized over racing performance.