6an X 7/8-20 Dual Inlet Holley-4160 Carb

The 6AN X 7/8-20 Dual Inlet Holley-4160 Carb adapter from Redhorse Performance is an essential fuel line fitting for builders upgrading or maintaining classic carburetor fuel systems. Designed for Holley 4160-series carburetors, this dual inlet adapter connects your high-flow fuel supply lines while maintaining proper flow rates and pressure stability. Whether you're restoring a vintage muscle car, tuning a street rod, or optimizing a performance build, this precision adapter ensures reliable fuel delivery without compromise.

This fitting features a 6AN hose connection size paired with a 7/8-20 thread specification, enabling seamless integration with modern braided stainless-steel fuel lines while interfacing with the carburetor's inlet ports. Redhorse Performance manufactures this adapter to tight tolerances, ensuring zero fuel seepage at both the hose and carb connection points under operating pressure. The dual inlet design accommodates split fuel feed configurations common in dual-carb setups or advanced fuel distribution systems, allowing independent line routing for improved flow management and easier engine bay packaging.

This adapter is ideal for enthusiasts upgrading fuel delivery on 1960s–1980s Holley 4160 applications, including small-block and big-block Chevrolet, Ford, and Mopar platforms. It's particularly valuable when transitioning from rubber fuel line to modern AN-rated braided hose, which offers superior durability and cleaner engine bay aesthetics. Installation requires only basic hand tools and wrench work; ensure the 7/8-20 threads are sealed with appropriate thread sealant to prevent leaks under load. Compatibility depends on your specific carburetor model and fuel system configuration, so verify your carb's inlet port specification before ordering.