Radium Fuel Rails Top Feed | Subaru EG33 / EZ30 / EZ36 (20-0764-02 / 20-0763-02 / 20-0765-02)

Subaru's flat six wears its fuel rails where the heat is, and the factory parts were never sized for more than factory power.

Radium Engineering top feed fuel rails for the Subaru EG and EZ flat six engines are CNC machined from solid 6061 aluminum, black anodized and laser etched, with a large internal bore that will not limit the engine. Each rail carries three 8AN ORB threaded ports, six across the pair, opening the door to proper AN plumbing, a regulator, a gauge, or a pulse damper. Machined thermal insulating spacers are included for injector height flexibility and heat isolation, and the rails suit all fuel types including E85.

Choose Your Version

• Phase-I EZ30 (20-0764-02): for the original EZ30, identified by a single exhaust port per bank and Subaru's air-assist injection. Includes air-assist injector seats.
• EG33 (20-0763-02): top feed conversion for the Alcyone SVX. Includes 27mm injector seats.
• Phase-II EZ30 and EZ36 (20-0765-02): an upgrade rail, AVCS compatible with clearance at the solenoid.

What You'll Feel

• Flow capacity that stops being the limit as injectors and power grow
• Six 8AN ORB ports to place a regulator, gauge, or damper wherever it fits
• Direct bolt-on fitment with mounts, spacers, and hardware supplied
• Thermal isolation from the head through machined press-in spacers

Features

• CNC machined 6061 aluminum, black anodized and laser etched
• Three 8AN ORB threaded ports per rail, six total
• Large internal bore supporting high power requirements
• 11mm thermal insulating press-in spacers
• Injector seats included on the EG33 and Phase-I EZ30 versions
• Compatible with all fuel types including E85

The Details

Injector requirements differ sharply between versions and this is where orders go wrong.

The EG33 is a top feed conversion requiring a universal injector with 14mm O-rings top and bottom and a 34mm height. Do not buy WRX top feed injectors. Injector Dynamics 1050.34.14.14, 1300.34.14.14, 1700.34.14.14, and 2600.34.14.14 are examples that fit.

The Phase-I EZ30 has 11mm injector bores and takes the factory air-assist injectors with no modification. Those OEM injectors are not replicated in the aftermarket, so going aftermarket means installing the supplied Radium injector seats and using a 48mm injector with an 11mm upper and 14mm lower O-ring, such as Injector Dynamics 1050.48.11.14 and its siblings.

The Phase-II EZ30 and EZ36 rail is an upgrade rail, not a conversion: OEM or OEM-equivalent injectors are required, matching factory height and O-ring dimensions. Radium does not make injector recommendations for it.

Two further notes. On the Phase-II EZ30 only, the front rail port on the RH cylinder head sits very close to the AVCS and must be plugged with a 14-0150 8AN ORB plug. On the Phase-I EZ30, the OEM fuel pressure regulator can be reused with a 20-0301 adapter. No fittings are included on any version.

Kit Includes

• Black anodized laser etched aluminum fuel rails (x2)
• EG33: 27mm injector seats, fuel rail mounts, stainless mounting hardware
• Phase-I EZ30: Subaru air-assist injector seats, 11mm thermal insulating press-in spacers, stainless M8x1.25 mounting bolts
• Phase-II EZ30 / EZ36: 11mm thermal insulating press-in spacers, stainless mounting hardware
• NOT included: AN fittings, fuel injectors, regulator, and gauge

Applications

• EG33 (20-0763-02): Subaru Alcyone SVX
• Phase-I EZ30 (20-0764-02): 00-04 Outback H6, 00-03 Lancaster 6, 02-03 Legacy GT30 and RS30, 2002 Blitzen 6 Wagon
• Phase-II EZ30 and EZ36 (20-0765-02): 04-09 Legacy and Outback 3.0R, 10-19 Legacy and Outback 3.6R, 06-14 Tribeca

Important Notes

• EG33 requires universal 34mm injectors with 14mm O-rings top and bottom; WRX top feed injectors will NOT work
• Phase-I EZ30 aftermarket injectors must be 48mm with 11mm upper and 14mm lower O-rings, using the supplied injector seats
• Phase-II EZ30 only: plug the RH front rail port with a 14-0150 8AN ORB plug due to AVCS proximity
• All fittings sold separately