780CFM Carburetor - Hot Rod Series

The 780 CFM carburetor Hot Rod Series (model HR-780-VS) is a four-barrel fuel-delivery system engineered for high-performance street and competition engines requiring precise air-fuel mixture control across a broad RPM range. Designed for builders and enthusiasts who demand reliable, repeatable performance in both stock-block and modified powerplants, this square-bore carburetor addresses the core challenge of fuel atomization and distribution at varying throttle positions—critical for consistent idle quality, throttle response, and power delivery.

Built from aluminum construction and finished in tumble-polished detail, the HR-780-VS features a vacuum-actuated secondary fuel system and electric choke assembly for cold-start reliability and warm-up enrichment. The dual-inlet design ensures balanced fuel distribution to all four barrels, while the 780 cubic feet per minute flow rating positions this carburetor in the mid-range sweet spot for naturally aspirated engines in the 350–450 cubic-inch displacement class. Vacuum secondary technology means secondary barrels open progressively as engine load increases, preventing lean-out conditions and fuel starvation during acceleration—a proven approach favored in both street and strip applications.

This carburetor suits owners of classic muscle cars, street rods, and performance trucks where tuning precision and visual appeal matter equally. Installation requires a standard four-barrel intake manifold with square-bore bolt pattern and appropriate fuel supply plumbing; builders should verify fuel pressure (typically 5–6 PSI for proper float bowl operation) and confirm adequate return-line capacity. At 9.62 pounds and measuring 11.3 x 7.9 x 12.4 inches, the HR-780-VS integrates cleanly into most engine bays without clearance issues, making it a popular choice for retrofit builds and carburetor upgrades seeking improved throttle response and fuel economy over original equipment.