Radium Injector Seats for Top Feed Conversion Fuel Rails - Subaru

Radium Injector Seats - Top Feed Conversion, Subaru

Suits:

• Subaru engines with OEM side-feed injectors requiring conversion to top-feed
• 22mm seats — later Subaru engines (e.g. EJ20/EJ25 later variants)
• 26mm seats — early Subaru engines

The Radium Engineering Subaru Injector Seats are the same machined aluminium seats used in Radium fuel rail kits. Required when converting OEM side-feed injectors to top-feed injectors using a 14mm lower O-ring. The seats press into the OEM side-feed injector bores on the intake manifold or TGV housings and seal to the machined injector counterbore using the included Viton O-ring.

Important — measure before ordering:

• 22mm seats — for later Subaru engines — green anodised
• 26mm seats — for early Subaru engines — black anodised

Variant & Part Number Guide

Features

• CNC-machined billet 6061 aluminium
• Bright-dip R5 Type-II anodising (green = 22mm, black = 26mm)
• Laser etched logo
• Viton O-rings included — compatible with all fuel types including E85 and methanol
• 14mm lower injector O-ring bore
• Same seats used in Radium Subaru fuel rail kits

Why Radium Engineering?

• ✅ Manufactured in the USA to motorsport-grade tolerances
• ✅ CNC-machined billet aluminium components built for performance and longevity
• ✅ Trusted by high-power build tuners and race teams worldwide
• ✅ Same seats used in Radium’s own Subaru fuel rail kits
• ✅ Compatible with E85, pump petrol, methanol, and all exotic fuel types