Free Shipping on orders over $150*
Call Us: 1-866-381-4618
Supertech Racing Valves and Pistons

Supertech High Performance Valves: Subaru

SUBARU EJ20 / EJ25 WRX / STi Turbo DOHC
INTAKE VALVEPart NumberEXHAUST VALVEPart Number
Head DiamStem. DiamLengthBlack NitridedHead DiamStem. DiamLengthBlack Nitrided / Inconel
Impreza WRX / STi36mm (std)5.96mm104.35mm (std)SIVN-101032.00mm (std)5.96mm104.7mm (std)SEVN-1010 / SEVI-1010*
36.50mm (+0.5)104.35 (std) or 103.85mmSIVN-1012 or SIVN-1012/232.50mm (+0.5)104.7 (std) or 104.50mmSEVN-1012 / SEVI-1012*
37.00mm (+1.0)104.35 (std) or 103.85mmSIVN-1014 or SIVN-1014/233.00mm (+1.0)104.7 (std) or 104.20mmSEVN-1014/2 / SEVI-1014*
ENGINE COMPONENTS
VALVE SPRINGSOuter SpringInner SpringPressure (lbs@mm)Max Net liftCoil BindRateTitanium Retainer
Part NumberO.D. (mm)I.D. (mm)O.D. (mm)I.D. (mm)SeatOpen (lift)mmmmlbs./mmPart Number
SPR-TS1015/SU327.5020.0020.0015.2064 @ 36.0199 @ 11.515.3020.7012.10RET-TS60/WRX1 + SEAT-TS/SUB3 (no OEM)
SPR-TS1015/SU127.5020.0020.0015.2070 @ 35.5209 @ 11.513.8020.7012.10RET-TS60/WRX1 + SEAT-TS/SUB (no OEM)
SPR-TS1015/SU427.5020.0020.0015.2082 @ 34.25220 @ 11.512.5020.7012.10RET-TS60/WRX1 + SEAT-TS/SUB4 (no OEM)
VALVE GUIDESINTAKE: GDE-SUEJ6-IEXHAUST: GDE-SUEJ6-E
VALVE SEALSINTAKE: VS-TS6-EEXHAUST: VS-TS6-E
CAM FOLLOWERSCF-35/2.7+ or CF-35/3.7+ (+ Shims 1.5mm to 3.2mm thick) Both Versions of retainers for over the bucket and under the bucket shims are available
SUBARU EJ25 Non Turbo DOHC
INTAKE VALVEPart NumberEXHAUST VALVEPart Number
Head DiamStem. DiamLengthBlack NitridedHead DiamStem. DiamLengthBlack Nitrided / Inconel
EJ25 Non Turbo SOHC 99-0536.00mm (std)5.96mm105.9mm (std)SIVN-101632.00mm (std)5.96 mm106.2mm (std)SEVN-1016 / SEVI-1016
37.00mm (+1.0)108.10mm (oversize)SIVN-101533.00mm (+1.0)108.35mm (oversize)SEVN-1015
ENGINE COMPONENTS
VALVE SPRINGSOuter SpringInner SpringPressure (lbs@mm)Max Net liftCoil BindRateTitanium Retainer
Part NumberO.D. (mm)I.D. (mm)O.D. (mm)I.D. (mm)SeatOpen (lift)mmmmlbs./mmPart Number
SPR-TS1015/SU527.5020.0020.0015.2070 @ 35.5209 @ 11.513.8020.7012.10RET-TS60/WRX1 + SEAT-TS/SUB-5 (no OEM)
VALVE SEALSINTAKE: VS-TS6-IEXHAUST: VS-TS6-E
CAM FOLLOWERSCF-35/2.7+ or CF-35/3.7+ (+ Shims 1.5mm to 3.2mm thick) / RET-TS60/STI available for Under the Bucket Shim (JDM)
TITANIUM VALVESPLEASE CALL
SUBARU EZ30 H6 24v
INTAKE VALVEPart NumberEXHAUST VALVEPart Number
Head DiamStem. DiamLengthBlack NitridedHead DiamStem. DiamLengthBlack Nitrided / Inconel
EZ30 H6 (1st Gen)35mm (std)5.48mm103.4mmSIVN-2301F30.5mm (std)5.45mm103.25mmSEVN-1021D
36mm (+1.0)SIVN-2304D31.00mm (+0.5)SEVN-1030D
31.5mm (+1.0)SEVN-1033D
EZ30 w/AVCS (2nd Gen)35mm (std)5.45mm99.8mmSIVN-104330.5mm (std)5.45mm105.25mmSEVI-1043D
ENGINE COMPONENTS
VALVE SPRINGSOuter SpringInner SpringPressure (lbs@mm)Max Net liftCoil BindRateTitanium Retainer
Part NumberO.D. (mm)I.D. (mm)O.D. (mm)I.D. (mm)SeatOpen (lift)mmmmlbs./mmPart Number
EZ30 H6cyl. ( 1st Gen)
SPR-TS1015/SU627.5020.0020.0015.2063 @ 36.10184 @ 1015.2020.7012.10RET-TS5.5/T1 + SEAT-TS/SUB
EZ30 H6cyl W/ AVCS Variable intake lift (2nd Gen)
SPR-H1002D (intake)29.1021.9020.5015.5085 @ 31.9195 @ 1112.4019.5010.00RET-H1000/T2 + Factory seat
SPR-TS1015 (exhaust)27.5020.0020.0015.2060 @ 36.10193 @ 1115.4020.7012.10RET-TS5.5/T2 + SEAT-TS/SUH6E
CAM FOLLOWERS (1st Gen)CF-34/2.5+ or CF-34/3.5+ (+ Shims 1.5mm to 2.7mm thick)
CAM FOLLOWERS (2nd Gen)Diam 33mm
SUBARU EG33 H6 24v
INTAKE VALVEPart NumberEXHAUST VALVEPart Number
Head DiamStem. DiamLengthBlack NitridedHead DiamStem. DiamLengthBlack Nitrided / Inconel
SVX 3.3L36mm (std)5.96mm92.10mm (+2.0 / 4.5mmtip)SIVN-108032mm (std)5.96mm92.7mm (+2 / 4.5mm Tip)SEVI-1080
LEFT COLUMN
RIGHT COLUMN