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Reinforced valve spring kit Subaru EZ30

€990.52 (tax incl.)

€1,238.15 (tax incl.) -20%

Kits of 24 reinforced valve springs for Subaru EZ30 engines.

Brand: SUPERTECH
Engines: Subaru EZ30, 3.0 litre flat-six, 24 valves, two generations
Springs: double
Contents: springs, retainers and spring seats, depending on the kit

The Subaru EZ30 engines

The EZ30 is the Subaru 3.0 litre, 24 valve flat-six. This page covers both of its generations, the first and the second with variable valve timing, each with its own kit.

Each kit replaces the standard springs and their retainers with 24 springs: the SPRK-SUEZ30-W holds two spring part numbers, 12 of each, the SPRK-TS1015-SU6 a single one.

SUPERTECH reinforced valve spring kit

As soon as the lobe moves off, the spring brings the valve back to its seat and holds it on the cam. Too soft for the revs aimed at, it lets the valve bounce and even reach the piston: that is valve float.

The SPRK-TS1015-SU6 (1st gen.) gives 63 lbs at 36.1 mm; the SPRK-SUEZ30-W (2nd), 85 lbs at 31.9 mm and 65 lbs at 34.6 mm on exhaust.

Valve spring kit technical specification

Part number	Brand	Springs	Outer / inner Ø	Seat pressure	Open pressure	Rate	Max lift	Kit contents
SPRK-TS1015-SU6	SUPERTECH	Double 63 lbs	Outer 27.5 / 20.0 mm Inner 20.0 / 15.2 mm	63 lbs at 36.1 mm	184 lbs at 10.0 mm	12.1 lbs/mm	15.2 mm	24 SPR-TS1015/SU6 springs, 24 RET-TS5.5/T1 retainers, 24 SEAT-TS/SUB spring seats
SPRK-SUEZ30-W	SUPERTECH	Double 85 / 65 lbs		85 lbs at 31.9 mm 65 lbs at 34.6 mm (exhaust)				12 SPR-H1002D springs, 12 SPR-TS1012 springs, 12 RET-TS5.5/T1F retainers, 12 RET-H1000/T2 retainers, 12 SEAT-TS/SUH6E spring seats (exhaust)

Valve spring kit fitting details

Part	Subaru original	Reinforced spring kit
Spring		SPRK-SUEZ30-W: SPR-H1002D and SPR-TS1012 SPRK-TS1015-SU6: SPR-TS1015/SU6
Retainer		SPRK-SUEZ30-W: RET-TS5.5/T1F and RET-H1000/T2 SPRK-TS1015-SU6: RET-TS5.5/T1
Spring seat		SPRK-SUEZ30-W: SEAT-TS/SUH6E (exhaust) SPRK-TS1015-SU6: SEAT-TS/SUB
Collets

The SPRK-SUEZ30-W kit holds 12 SPR-H1002D springs, 12 SPR-TS1012 springs, 12 RET-TS5.5/T1F retainers, 12 RET-H1000/T2 retainers and 12 SEAT-TS/SUH6E spring seats, the latter for the exhaust side only. The SPRK-TS1015-SU6 kit holds 24 SPR-TS1015/SU6 springs, 24 RET-TS5.5/T1 retainers and 24 SEAT-TS/SUB spring seats.

Installed height is measured with the valve closed, between the spring seat and the retainer. The SPRK-SUEZ30-W gives 85 lbs at 31.9 mm and 65 lbs at 34.6 mm, the SPRK-TS1015-SU6 63 lbs at 36.1 mm. If the height grows after valve seat work or head skimming, the pressure drops by the spring rate for each millimetre gained: measure every valve before ordering.

	SUPERTECH
Installed height	SPRK-TS1015-SU6 : 36.1 mm SPRK-SUEZ30-W : 31.9 mm 34.6 mm (exhaust)
Seat pressure at this height	63 lbs 85 lbs 65 lbs (exhaust)

Technical guide

Our brands

Based in San Jose, California, SUPERTECH has built valve train parts for competition for over thirty years. Each batch of chrome-silicon-vanadium wire used to coil its springs is examined by X-ray, ultrasound and laser before any kit is shipped to a workshop or a customer.

How to choose

The higher the seat pressure, the better the valve stays on the cam when the engine revs hard: a livelier camshaft or higher revs become possible without float. The two kits offer three seat pressures, 63, 85 and 65 lbs. A higher pressure also loads the cams harder, so do not go above what is needed. Before ordering, ask us to confirm that your camshaft lift suits the kit.

Criterion

Key point

Choosing the pressure

The numbers 63, 85 and 65 are seat pressures in pounds, each taken at the installed height given in the table: 36.1 mm for 63 lbs, 31.9 mm for 85 lbs, 34.6 mm for 65 lbs. Start from your camshaft lift and the intended use, without aiming for the highest pressure on principle: too much wears the cams and the rest of the valve train. The kit is chosen first by engine generation, shown in the compatibility table.

Single or double springs

These kits use double springs: two concentric springs nest together, split the load and calm each other's oscillations, which helps the valve follow the cam profile. A single spring is simpler and suits milder builds, but this page does not offer one.

When reinforced springs become necessary

A camshaft livelier than the standard one
A rev limit raised after a remap
A supercharger or turbo added to the flat-six
Frequent use on track, rally or drift
Tired springs, or valves floating earlier than before

Compatible vehicles

Model	Engine code	Power	Years
Subaru Legacy III (BE) 3.0 AWD (BEE)	EZ30 (1st generation)	220 hp	1998 - 2003
Subaru Legacy III (BE) 3.0 H6 AWD (BEE)	EZ30 (1st generation)	209 hp	2000 - 2003
Subaru Legacy III Break (BH) 3.0 AWD (BHE)	EZ30 (1st generation)	220 hp	2000 - 2003
Subaru Legacy III Break (BH) 3.0 H6 AWD (BHE)	EZ30 (1st generation)	209 hp	2000 - 2003
Subaru Outback (BH) 3.0 AWD	EZ30D (1st generation)	219 hp	2000 - 2003
Subaru Outback (BH) 3.0 H6 AWD (BHE)	EZ30 (1st generation)	209 hp	2000 - 2003
Subaru Outback (BP) 3.0 AWD	EZ30D (1st generation)	219 hp	2003 - 2004
Subaru Legacy IV (BL) 3.0 R AWD (BLE, B13)	EZ30 (2nd generation)	245 hp	2003 - 2009
Subaru Legacy IV (BL) 3.0 R AWD (BLE)	EZ30 (2nd generation)	250 hp	2007 - 2009
Subaru Legacy IV Break (BP) 3.0 R AWD (BPE)	EZ30 (2nd generation)	245 hp	2003 - 2009
Subaru Legacy IV Break (BP) 3.0 R AWD (BPE)	EZ30 (2nd generation)	250 hp	2003 - 2009
Subaru Outback (BP) 3.0 AWD (BPE)	EZ30 (2nd generation)	245 hp	2003 - 2009
Subaru Tribeca (B9) 3.0 (WXE)	EZ30 (2nd generation)	250 hp	2005 -
Subaru Tribeca (B9) 3.0 (WXE)	EZ30 (2nd generation)	245 hp	2006 -

Important: the SPRK-TS1015-SU6 kit is for first generation EZ30 engines and the SPRK-SUEZ30-W kit for second generation ones, with variable valve timing; the generation is shown on each line of the table. Check the engine code of your car before ordering.