Radium Engineering Nissan KA24DE Top Feed Conversion Fuel Rail - 20-0957

The Radium Engineering Nissan KA24DE Top Feed Conversion Fuel Rail (part number 20-0957) is a purpose-built upgrade for KA24DE-powered Nissan vehicles looking to move beyond the limitations of the factory side-feed injector setup. Designed as a direct bolt-on replacement for all twin-cam KA24DE engines, this fuel rail converts the OEM side-feed configuration to a top-feed layout, unlocking compatibility with a wide range of high-flow aftermarket injectors. Whether you're building a track-prepped 240SX or a high-horsepower street car running E85, this is the fuel rail that serious KA builders specify.

Key Features & Benefits

• Top-Feed Conversion: Converts the OEM side-feed injector setup to top-feed, allowing use of widely available high-flow 14mm O-ring fuel injectors from leading manufacturers like Injector Dynamics — a critical upgrade path for builds pushing beyond stock power levels.
• Large 0.69" Internal Bore: The oversized internal bore ensures consistent fuel delivery pressure across all cylinders, supporting demanding engine builds without becoming a restriction in the fuel system.
• CNC Machined from 6061 Aluminum: Precision machining from billet 6061 aluminum guarantees accurate port alignment and a direct bolt-on fit with KA24DE engine blocks — no modification required.
• Black Anodized Finish: The black anodized surface provides both a clean, professional appearance under the hood and genuine compatibility with all fuel types, including ethanol-blended fuels such as E85.
• Three 8AN ORB Ports + One 1/8 NPT Port: Three ports tapped for 8AN ORB (located at the ends and bottom of the rail) plus one 1/8 NPT port (top) give builders flexible routing options for feed lines, return lines, fuel pressure regulators, gauges, and dampers.
• Thermal Insulating Spacers & Washers Included: The included thermal insulating hardware reduces heat transfer from the intake manifold to the fuel rail, helping maintain consistent fuel temperatures — especially important on hot-running builds.
• Direct Bolt-On Design: No welding, drilling, or custom fabrication required. The rail mounts directly to the KA24DE head using the included stainless steel mounting bolts.

Specifications

• Part Number: 20-0957
• Brand: Radium Engineering
• Material: CNC machined 6061 aluminum
• Finish: Black anodized
• Internal Bore: 0.69"
• Port Configuration: Three 8AN ORB ports (ends and bottom); one 1/8 NPT port (top)
• Injector O-Ring Size: 14mm top and bottom
• Injector Height Requirement: 34mm (universal top-feed injectors)
• Fuel Compatibility: All fuel types including E85
• Mounting Hardware: Stainless steel bolts included
• CARB Status: Not CARB legal; not for sale in California

Fitment

The Radium Engineering 20-0957 fuel rail is compatible with the following KA24DE-equipped vehicles:

• 1991–1998 Nissan 240SX (KA24DE)
• 1997–2000 Nissan R'nessa (KA24DE)
• 1998–2001 Nissan Presage U30 (KA24DE)
• 1999–2001 Nissan Bassara U30 (KA24DE)
• 1993–1997 Nissan Bluebird (KA24DE)

Important Xcessive Intake Manifold Note: When used in combination with an Xcessive intake manifold, the fuel rail may require shimming to achieve the correct height depending on the injectors used. Additionally, the injector seats included in the kit will not be used in that configuration.

This rail is designed for the twin-cam KA24DE engine. Verify your specific engine code before ordering if you are unsure of your application.

What's in the Box

• Black anodized aluminum fuel rail
• Thermal insulating spacers (sized for 34mm height universal injectors)
• Thermal insulating washers
• Black anodized aluminum injector seats
• Stainless steel mounting bolts

Note: Fuel injectors are NOT included and must be sourced separately. Fittings for the 8AN ORB and 1/8 NPT ports are also not included — appropriate fittings must be selected based on your specific fuel system layout.

Why Buy from ThreePiece.us

ThreePiece.us carries the full Radium Engineering lineup and backs every order with free shipping on every product, no minimum required. Need to spread the cost of your fuel system build? Affirm financing is available at checkout so you can get the parts you need now. Our team has served over 10,000 customers and is available to help verify fitment, answer application questions, or guide you through building out your complete fuel system — just call 813-535-5801 or use our fitment help contact form.

Frequently Asked Questions

Q: Does this fuel rail work with the KA24DE in a 1991–1998 Nissan 240SX?
A: Yes. The Radium Engineering 20-0957 is explicitly compatible with the 1991–1998 Nissan 240SX equipped with the KA24DE twin-cam engine and is designed as a direct bolt-on for that application.

Q: What injectors are compatible with this fuel rail?
A: The rail is designed for top-feed injectors with 14mm O-rings on both the top and bottom, and a 34mm overall height. The included thermal insulating spacers are sized for this 34mm injector height. Examples of compatible injectors from Injector Dynamics include the 1050-XDS, 1300-XDS, 1700-XDS, and 2600-XDS in the appropriate dimensional configuration. Injectors are not included with the kit.

Q: What fittings do I need for the fuel inlet and outlet ports?
A: The rail features three ports tapped for 8AN ORB (at both ends and the bottom) and one 1/8 NPT port at the top. Fittings are not included — you'll need to select appropriate 8AN ORB adapter fittings and a 1/8 NPT adapter or plug based on your specific fuel system setup. Radium Engineering offers compatible fittings, regulators, dampers, and gauge adapters separately.

Q: Is this product legal for use in California?
A: No. This product is not CARB legal and is not for sale in California. It is intended for off-road or racing use where applicable regulations permit.