Radium Engineering Injector Seat (27mm)
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Radium Engineering Injector Seat (27mm) - Subaru WRX (GC8) / Forester (SF) / Liberty (BD/BG) / SVX
This billet aluminium injector seat (SKU 20-0305) lets early Subaru EJ and EG33 intake manifolds take top feed injectors when you convert from the factory side feed setup. It is the same 27mm seat Radium fits to its 20-0569-02 and 20-0579-02 EJ top feed conversion rails and its 20-0763-02 SVX rail. It presses straight into the manifold or TGV injector port with no machining, and the included FKM O-ring seals it in the counterbore to stop vacuum and boost leaks.
The seat bore suits injectors with a common 14mm lower O-ring. Radium lists this seat for early EJ-powered Impreza WRX and WRX STI, Forester and Liberty models, plus the SVX with the EG33 flat six.
Choose a single seat (SKU 20-0305), a set of four for an EJ (SKU 20-0305-04) or a set of six for the EG33 (SKU 20-0305-06) from the variant selector.
Note: One seat is needed per injector (four for an EJ, six for the EG33). Later EJ engines use the 22mm seat instead, and Radium advises measuring before ordering. Installation by a professional is recommended.
Features
- 27mm seat for early Subaru EJ and EG33 intake manifolds
- Press-fit install with no machining required
- FKM O-ring included to seal against vacuum and boost
- Bore suits a common 14mm lower injector O-ring
- Machined aluminium, black anodised
- Sold as a single, a set of 4 or a set of 6
- The same seat used in Radium's EJ and SVX top feed conversion rails
Pairs Well With
- Radium Engineering Fuel Rails (Top Feed Conversion) - Subaru SVX (EG33)
- Radium Engineering Top Feed Conversion Fuel Rails - Subaru WRX / STI (EJ20 V3-V6)
- Radium Engineering Top Feed Conversion Fuel Rails - Subaru WRX / STI (EJ20 V1-V2)
- Radium Engineering Injector Seats (22mm) - Subaru WRX STI (EJ257)
Need help confirming fitment? Contact our team at sales@chicaneaustralia.com.au.
Product
- Brand
- Radium Engineering
- Seat size
- 27mm (Radium; some resellers list it as 26mm)
- Part number(s)
- 20-0305, 20-0305-04, 20-0305-06
- Single – Part number
- 20-0305
- Set of 4 – Part number
- 20-0305-04
- Set of 6 – Part number
- 20-0305-06
Details
- Product
- Injector seat, 27mm (single, set of 4 or set of 6)
- Injector lower O-ring
- 14mm
- Seal
- FKM O-ring (included)
- Material
- Machined aluminium, black anodised
- Used in
- Radium 20-0569-02 and 20-0579-02 EJ rails, 20-0763-02 SVX rail
- Quantity
- Single, set of 4 or set of 6, one needed per injector
Contents
Black anodised 27mm injector seat with FKM O-ring (x1, x4 or x6 per the Quantity selected)
Lubricate the O-ring before installation.

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