Fuel Rail Kit - For 300-562/300-563/ 300-564

The Holley Fuel Rail Kit for 300-562/300-563/300-564 is a high-flow fuel distribution solution designed for big block Chevy EFI applications. This aluminum fuel rail kit delivers precise fuel metering to modern engine management systems while maintaining the flow capacity required for performance and reliability in forced-induction and naturally aspirated builds. Built from black anodized aluminum, the rail combines weight savings with corrosion resistance—critical for vehicles exposed to varied climates and long-term storage.

The kit features 8 AN female O-ring inlet and outlet ports, supporting high-volume fuel pump configurations without restriction. O-ring face seals provide positive clamping pressure and eliminate the need for thread sealant, reducing installation complexity and risk of fuel leaks at critical junctions. Complete hardware inclusion means no hunting for missing fasteners or adapters—the rail is ready to bolt onto compatible Holley big block EFI intake manifolds. The 3.84-pound weight and compact profile minimize parasitic weight gain while fitting within tight engine bay layouts common to street and competition builds.

This rail suits builders working with Holley's big block Chevy EFI intake platform who demand factory-quality construction with verified fitment. It's ideal for restomod projects, carbureted-to-EFI conversions, and performance upgrades where stock fuel delivery can't support increased horsepower or aggressive tuning. Compatibility with models 300-562, 300-563, and 300-564 ensures correct fuel rail selection without cross-reference uncertainty.