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Inlet valve stem seals Subaru EJ20 EJ25

€7.54 (tax incl.)

€9.42 (tax incl.) -20%

Set of 8 inlet valve stem seals for Subaru EJ20 and EJ25, 6 mm stem.

Brands: FERREA, SUPERTECH
Engines: EJ20-GN, EJ20EMPI, EJ20G, EJ20U, EJ20X, EJ20Y, EJ205, EJ207, EJ255, EJ257, EJ25DET
Material: Viton (FKM) or polyacrylate (ACM)

Subaru engines concerned

These seals fit the 6 mm stem inlet valves of the Subaru EJ 16-valve flat-four engines: EJ20-GN, EJ20EMPI, EJ20G, EJ20U, EJ20X, EJ20Y, EJ205, EJ207, EJ255, EJ257 and EJ25DET. They are found in the Impreza, WRX and WRX STI, Legacy, Forester, Outback and Baja, from 116 to 400 hp, since 1991.

The engine has 8 inlet valves, 4 in each of its two cylinder heads. Each one receives a seal that caps the guide and meters the oil that lubricates the stem. On the EJ205 and EJ207, Subaru lists this seal as 13207AA050, 8 per engine.

FERREA and SUPERTECH inlet valve stem seals

Mounted atop the guide, the seal passes only the thin oil film the stem needs; starved of it, stem and guide wear quickly. When heat hardens it or it wears, oil reaches the chamber: the engine burns oil, smokes blue on start-up or after lengthy idling, and carbon coats the valves.

FERREA seals are moulded in Viton (FKM), an elastomer built for heat, with a built-in spring keeping the lip firmly around the stem and helps keep oil consumption in check under hard use. On the inlet side, SUPERTECH opts for polyacrylate (ACM) instead.

Stem seal technical specifications

Part number	Brand	Material	Stem Ø	Guide Ø	Seal outside Ø	Lip spring
VS1016*8	FERREA	Viton (FKM)	6 mm			Yes
VS-TS6I-8	SUPERTECH	Polyacrylate (ACM)	6 mm	11.0 mm	13.4 mm

FERREA VS1016*8: EJ20-GN, EJ20EMPI, EJ205, EJ207.

SUPERTECH VS-TS6I-8: EJ20-GN, EJ20EMPI, EJ20G, EJ20U, EJ20X, EJ20Y, EJ205, EJ207, EJ255, EJ257, EJ25DET.

Stem seal installation

Part	Original	Reinforced
Inlet stem seal	Subaru 13207AA050	Replaced by this set
Exhaust stem seal	Subaru 13211AA050	VS1015*8 / VS-TS6E-8
Valve guides	Subaru 13212-AA130 (inl.) / 13213-AA120 (exh.)	GDE-SUEJ6-I-8 / GDE-SUEJ6-E-8
Valves	6 mm stem	Inlet / Exhaust

Technical guide

Our brands

	FERREA dates back to 1978, when Horacio Ferrea and Daniel Urrutia opened shop in Fort Lauderdale. Valves, guides, springs and stem seals all come from its Florida and Argentina factories, built for racing and high-performance engines.
	SUPERTECH, based in San Jose, California, has worked on racing valvetrains for over 30 years. Every part goes through finite element design, and its manufacture is then inspected with ultrasound, radiography and laser gauging.

FERREA or SUPERTECH?

Both sets target the same 6 mm stem. FERREA fits a lip-sprung Viton (FKM) seal at inlet and exhaust alike; SUPERTECH chooses polyacrylate (ACM) at the inlet, reserving Viton for the exhaust. Polyacrylate handles 177 °C (350 °F); Viton, 204 °C (400 °F) continuously per SUPERTECH.

When valve stem seals must be replaced

Oil use rising, blue smoke when starting or after idling
Valves removed or cylinder head rebuilt
New valve guides being fitted
Upgraded valves or springs installed

Vehicle compatibility

Model	Engine code	Power	Years
Baja	EJ255	233 hp	2003-2006
Forester (SF_)	EJ205	170-177 hp	1998-2002
Forester (SG_, S11SG)	EJ205 / EJ255 / EJ257	177-256 hp	2002-2009
Forester (SH_)	EJ205 / EJ255	230-270 hp	2007-2015
Impreza	EJ255 / EJ257	233-309 hp	2007-2011
Impreza (GC)	EJ20G / EJ205 / EJ207	211-280 hp	1992-2000
Impreza (GD)	EJ205 / EJ207 / EJ255 / EJ257	204-320 hp	2000-2008
Impreza (GE, GV)	EJ207 / EJ255 / EJ257	230-320 hp	2007-
Impreza (GF)	EJ20G / EJ20U / EJ205 / EJ207	211-280 hp	1993-2000
Impreza (GFC)	EJ20G / EJ207	211-280 hp	1996-2000
Impreza (GG)	EJ205 / EJ207 / EJ255 / EJ257	218-300 hp	2000-2008
Impreza (GR, GH, G3)	EJ255 / EJ257	230-400 hp	2008-2014
Legacy I (BC, BF, BJ)	EJ20-GN / EJ20EMPI	116-200 hp	1991-1994
Legacy II (BG)	EJ20EMPI	116 hp	1994-1998
Legacy IV (BL)	EJ20X / EJ20Y / EJ255 / EJ25DET	179-272 hp	2003-2015
Legacy IV (BP)	EJ20X / EJ20Y / EJ255 / EJ25DET	190-272 hp	2003-2009
Legacy V (BM)	EJ255	233-286 hp	2009-2015
Legacy V (BR)	EJ255	265-286 hp	2009-2014
Outback (BP)	EJ255 / EJ25DET	233-265 hp	2005-2009
WRX	EJ255 / EJ257	233-309 hp	2011-
WRX (GJ)	EJ207 / EJ255 / EJ257	233-310 hp	2011-
WRX (GP)	EJ257	300 hp	2010-2014
WRX (VA)	EJ207 / EJ257	301-308 hp	2013-2022

OEM part number (Subaru EJ stem seals): 13207AA050 on the EJ205 and EJ207, 8 per engine; 13207AA120 and 13207AA110 on the EJ255.

Important: this set of 8 does not suit the EZ30 flat-six, which has 12 inlet valves with a 5.5 mm stem, nor the FA20, whose valves also have a 5.5 mm stem and take a different seal.