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Holley EFI

Hi-Flow Billet Fuel Rails for Gen III Hemi Engines

2003-2021 Naturally Aspirated Gen III Hemi Engines-5.7, 6.1, and 6.4 Liter

Part # 534-284
Estimated shipping date: 12/31/2021
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The new Hi-Flow billet fuel rails are a direct fit for naturally aspirated Gen III Hemi engines including the 5.7L, 6.1L, and the 6.4L from 2003-2021. The fuel rails feature a 5/8" diameter fuel passage that provides more flow capacity for high horsepower applications over the stock rails. The black anodized rails have -8 ORB ports on each end and an 1/8" NPT port for a fuel gauge installation if you choose to do so. The rails are designed with the factory injector clip reliefs so that your factory injectors and retaining clips can be reused. The kit includes fuel rails, mounting brackets and required mounting hardware.


  • Direct fit for naturally aspirated Gen III Hemi engines including the 5.7L, 6.1L, and the 6.4L engines
  • Machined Billet extrusions with laser etched “Holley EFI” Logo
  • Injector Clip feature retained so factory injector clips can be re-used. This is important as the clips locate the injector radially for proper injector spray pattern onto valves.
  • -8 ORB ports front and back
  • 1/8 NPT gauge ports machined directly into rail
  • Mounting brackets and hardware included

About Holley EFI

Holley is the new standard in EFI! Whether you're engine swapping your classic car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever!

BrandHolley EFI
Emission Code5
EngineGEN 3 HEMI
Product TypeFuel Rail
Part Number534-284

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Gauge ports can be used as fuel feed connection with NOS P/N 17015NOS Rail feed from factory line can also be accomplished with P/N 534-211

*Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

Some parts are not legal for use in California or other states with similar regulations.