4BBL HP Coated Carb Gas 406-430

The 4BBL HP Coated Carb Gas 406-430 by WILLYS CARB is a high-performance four-barrel carburetor engineered for serious engine builders and hot rod enthusiasts seeking maximum airflow and fuel delivery precision. This 850 CFM square-bore carb is purpose-built for naturally aspirated street and strip applications, particularly those running displacement in the 406–430 cubic inch range where stock carburetors fall short of optimal performance. Whether you're rebuilding a classic muscle car or constructing a modern restomod, this carb delivers the metering control and flow capacity required to unlock hidden horsepower and throttle response.

Built from aluminum construction with black powder-coat and black anodized finish options, the 4BBL HP Coated Carb Gas 406-430 resists corrosion and fuel degradation while maintaining a professional appearance under the hood. The square-bore design provides superior transition flow and even fuel distribution across all four venturis, while the no-choke configuration eliminates cold-start complexity and weight penalty—ideal for dedicated performance vehicles. Dual inlet ports accommodate flexible fuel supply routing, and the mechanical secondary system ensures progressive fuel staging during acceleration, preventing bog and lean-out conditions while maximizing efficiency at cruise and part-throttle operation.

Carburetor enthusiasts, engine builders, and vintage car restoration shops rely on this WILLYS unit for applications ranging from hot rod builds to marine propulsion swaps where traditional fuel injection isn't practical. The 850 CFM rating pairs ideally with headers, intake manifolds, and cam profiles tuned for mid-to-high RPM power delivery; experienced builders typically match this carb to engines producing 350–450 naturally aspirated horsepower. Installation requires standard four-barrel intake manifold compatibility and basic carburetor tuning knowledge; consult vehicle-specific jetting and idle mixture recommendations to achieve optimal performance and fuel economy on your specific engine platform.