850CFM Carburetor Street-Q Series

The Quick Fuel Technology 850 CFM Carburetor Street-Q Series is a four-barrel street performance carburetor engineered for high-flow fuel delivery in street and light competition applications. Rated at 850 cubic feet per minute, this aluminum carb delivers consistent fuel atomization and mixture control across the RPM band, making it a proven choice for engine builders and performance enthusiasts targeting reliable street performance without compromising daily drivability.

Built on a square bore platform with mechanical secondary activation, the SQ-850 features dual inlet fuel ports for flexible fuel system compatibility and a no-choke design for simplified cold-start operation on vehicles equipped with alternative starting methods. The tumble-polished aluminum finish provides both visual appeal and corrosion resistance. At 8.92 pounds, the carburetor is lightweight enough for retrofit applications while maintaining the structural rigidity required for sustained boost and load cycles. The four-barrel configuration distributes airflow evenly across all cylinders, promoting scavenging efficiency and reducing fuel puddling that occurs with less sophisticated designs.

The 850 CFM rating positions this carburetor in the sweet spot for small-block and mid-size engine platforms ranging from 350 to 450 cubic inches, particularly in street rods, classic muscle cars, and mild-to-moderate boost applications. The mechanical secondary design allows tuners to dial in fuel curve precisely as engine modifications evolve, avoiding the lag associated with vacuum-secondary designs. Buyers upgrading from restrictive OEM or undersized carburetors will observe noticeably improved throttle response and mid-range availability. The dual inlet configuration simplifies fuel system installation across various platform specifications, reducing adaptor requirements and potential lean-out conditions.