Holley EFI Billet Fuel Rail & Hose Kit – LS Truck Intake
534-245
The Holley EFI Billet Fuel Rail Kit for LS Truck Intakes is a complete high-flow fuel rail and plumbing package for performance GM LS applications using compatible truck-style intake manifolds. Manufactured by Holley EFI, the billet aluminum rails feature large 5/8" internal fuel passages and -8 ORB rail ports to support the increased fuel demands of high-horsepower engines and fuels such as E85, E98, and M1.
Unlike the rail-only version, this kit includes 6' of braided fuel hose, four 90-degree hose ends, two straight hose ends, and the required adapters to help complete the fuel system installation. The included plumbing gives builders the flexibility to feed both rails and route them to a high-flow fuel pressure regulator, making this a strong choice for custom LS swaps, off-road builds, race vehicles, and other performance applications.
Includes:
- (2) Holley EFI Billet Fuel Rails
- (4) -6AN to 3/4"-16 O-Ring Adapters
- (6') Braided Fuel Hose
- (4) 90-Degree -6AN Hose Ends
- (2) Straight -6AN Hose Ends
- Fuel Rail Mounting Brackets
- Required Mounting Hardware
Note: Fuel injectors and fuel pressure regulator are not included.
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Holley EFI |
| Part Number | 534-245 |
| Product Type | Fuel Rail & Hose Kit |
| Engine Family | GM LS |
| Intake Style | Compatible LS Truck Intake |
| Fuel Injection Type | Port Injection |
| Fuel System Type | EFI |
| Fuel Rail Material | Aluminum |
| Fuel Rail Finish | Bright-Dip Black Anodized |
| Fuel Passage Diameter | 5/8" |
| Fuel Rail Ports | -8 ORB / 3/4"-16 |
| Included Rail Adapters | (4) -6AN to 3/4"-16 O-Ring |
| Braided Hose | 6' |
| 90-Degree Hose Ends | (4) -6AN |
| Straight Hose Ends | (2) -6AN |
| Fittings Included | Yes |
| Fuel Injectors Included | No |
| Gaskets / Seals Included | Yes |
| Grade | Performance |
| Emission Code | 5 |
Fitment
Designed for compatible GM LS engines using LS truck-style intake manifolds. The supplied Holley fitment information includes the following engine displacements:
| Engine Size | Displacement |
|---|---|
| 4.8L V8 | 294 CID |
| 5.3L V8 | 325 CID |
| 5.7L V8 | 346 CID |
| 6.0L V8 | 364 CID |
| 6.2L V8 | 376 CID |
| 7.0L V8 | 427 CID |
Fitment Notes
- Designed around compatible LS truck-style intake manifolds; engine displacement alone does not guarantee fitment.
- Verify intake manifold style, injector spacing, and injector configuration before ordering.
- The rails use -8 ORB / 3/4"-16 ports and include adapters for the supplied -6AN plumbing.
- The included hose and fittings allow builders to create a custom fuel line layout based on engine and chassis packaging.
- Fuel pump, injector, regulator, and fuel line capacity should be matched to horsepower, fuel type, and total engine fuel demand.
Tech Insight
1. What is the advantage of this kit over a fuel rail-only kit?
This version includes the braided hose and AN hose ends needed to build much of the fuel rail plumbing. For a custom LS build, that reduces the number of individual fittings and hoses that need to be sourced separately.
2. What is the benefit of the 5/8" fuel passage?
The larger internal passage provides increased fuel volume for performance engines with higher fuel demand, making these rails better suited to high-horsepower applications than restrictive factory-style fuel rails.
3. Can these rails be used with E85 or other high-demand fuels?
The high-flow rail design is intended to support demanding fuel systems, including builds using fuels such as E85, E98, and M1. The entire fuel system must still use components and hose compatible with the specific fuel being used.
4. Can I run both fuel rails to one fuel pressure regulator?
Yes. The included hose and fittings provide flexibility for plumbing both rails into a single high-flow fuel pressure regulator. Final routing depends on the fuel system design and available space in the vehicle.
5. How do I know if these fit my LS engine?
Start with the intake manifold rather than engine displacement. This kit is designed for compatible LS truck-style intake manifolds. Verify the intake, injector spacing, injector height, and fuel rail mounting arrangement before ordering.
