534-285
The Holley EFI Billet Fuel Rail Kit for LSA and LS9 Engines is a direct-replacement high-flow fuel rail upgrade for supercharged GM 6.2L applications using factory-style LSA or LS9 fuel rail mounting. Manufactured by Holley EFI, these billet aluminum rails feature a large 21/32" internal fuel passage, -8AN ORB inlet ports, and additional -6 ORB ports for high-horsepower fuel systems, pressure sensors, gauges, or fuel pulse dampers.
The included brackets are designed for factory-height 33.60mm injectors, making this kit a clean upgrade for CTS-V, Camaro ZL1, Corvette ZR1, and compatible supercharger systems designed around OEM-style rails. The black anodized finish and laser-etched EFI logo provide a finished appearance, while an optional Holley 534-211 adapter kit allows builders to retain the factory fuel line quick-connect.
Note: Fuel injectors, -8AN fittings, -6 ORB fittings, fuel pressure regulator, and factory quick-connect adapter are sold separately.
| Specification | Details |
|---|---|
| Manufacturer | Holley EFI |
| Part Number | 534-285 |
| Product Type | Fuel Rail Kit |
| Engine Family | GM LSA / LS9 |
| Engine Displacement | 6.2L / 376 CID V8 |
| Fuel Injection Type | Port Injection |
| Fuel System Type | EFI |
| Material | Aluminum |
| Finish | Bright-Dip Black Anodized |
| Main Fuel Passage | 21/32" (0.656") |
| Injector Feed Passage | 1/4" (0.250") |
| Main Rail Ports | -8 ORB / 3/4"-16 |
| Auxiliary Ports | (4) -6 ORB / 9/16"-18 per rail |
| Included Port Plugs | (8) -6 ORB |
| Injector Height | 33.60mm Factory Height |
| Factory Fuel Line Compatible | Yes, with Holley P/N 534-211 Adapter Kit |
| Fuel Injectors Included | No |
| Gaskets / Seals Included | No |
| Grade | Performance |
| UPC | 090127843727 |
| Emission Code | 5 |
Designed for compatible GM LSA and LS9 6.2L supercharged engine applications. The supplied Holley fitment information includes Cadillac and Chevrolet applications such as CTS-V, Camaro ZL1, and Corvette ZR1.
| Make | Model / Submodel | Engine |
|---|---|---|
| Cadillac | CTS-V | 6.2L / 376 CID V8 |
| Chevrolet | Camaro ZL1 | 6.2L / 376 CID V8 |
| Chevrolet | Corvette ZR1 | 6.2L / 376 CID V8 |
The larger 21/32" main fuel passage increases available fuel volume and gives builders more flexibility when supporting higher-horsepower supercharged combinations, larger injectors, upgraded fuel pumps, or alternative fuels.
The center ports can be used for fuel pressure gauges, sensors, fuel pulse dampers, or custom fuel system plumbing. A -6 ORB to 1/8" NPT adapter can be used when installing many common pressure sensors or gauges.
Yes. Holley offers P/N 534-211 to adapt the rails to the factory fuel line quick-connect, allowing builders to upgrade the rails without completely redesigning the fuel supply connection.
Yes. The supplied mounting brackets are specifically designed around 33.60mm factory-height injectors. Different injector heights may require alternate brackets or changes to the installation.
No. They are a direct replacement for the OEM rails on factory LSA and LS9 blowers, but they can also fit aftermarket superchargers designed around the same OEM fuel rail mounting configuration.
