#6 to 7/8-20 Holley Carb Adapter

The #6 to 7/8-20 Holley Carb Adapter is a precision carburetor inlet fitting engineered for builders and mechanics who demand reliable fuel delivery in high-performance engine builds. This straight adapter bridges AN (Army-Navy) fuel line standards to Holley carburetor inlet ports, making it essential for custom fuel system installations on street engines, race cars, and vintage restorations where OEM fuel rails are replaced with aftermarket tuning setups. If you're upgrading to a Holley four-barrel or transitioning from stock to performance carburetors, this adapter ensures a leak-free, properly sealed connection between your fuel line and carburetor inlet.

Manufactured from aluminum and finished in red anodize, the #6 to 7/8-20 Holley Carb Adapter combines lightweight construction with corrosion resistance—critical properties in engine bays exposed to fuel soak and thermal cycling. The male 6 AN end accepts standard -6 fuel lines with JIC (Joint Industry Council) fittings, while the 7/8-20 male thread directly indexes into Holley carburetor inlet ports with zero modifications. The straight configuration eliminates flow restrictions and simplifies plumbing in tight engine compartments, and the anodized finish protects against oxidation and maintains aesthetic appeal in visible fuel systems. Red anodizing also serves as a visual identifier during assembly, reducing installation errors on complex fuel systems.

This adapter is indispensable for Holley carburetor users upgrading from carb-to-carb fuel delivery or converting mechanical fuel pump systems to electric in-tank pumps. Whether you're running a street machine with a 750 CFM Holley or a competition engine with a specialty intake, the #6 to 7/8-20 fitting ensures positive sealing without additional adapters or reducers. Installation requires only a wrench on both ends and a small amount of thread sealant compatible with fuel; no special tools needed. Verify your carburetor inlet thread size (7/8-20 is standard on most Holleys) and fuel line AN sizing before ordering to guarantee compatibility with your specific build.