EJ20 JDM/Euro WRX & STi INTAKE AVCS

GSC Power-Division Viton Valve Stem Seals for the Subaru EJ257, EJ207, and EJ205 6mm seal set. These are an upgrade from the standard OEM material to help cope with the higher heat caused increasing the performance of your engine. Sold as a set of 16

GSC Power-Division Billet S2 camshafts for the Subaru EJ207 version 7 and above with single AVCS. These cams are built to suit higher horsepower engine builds with a power range of 500 WHP and above.  Certain modifications are recommended to utilize the true potential of the S2's including an upgraded engine block, built/ported heads, and dyno engine tuning. Upgraded valve springs are required.  Due to the added lift and duration, cylinder head clearancing may be required.

• Check cylinder head for lobe clearancing.  

GSC Power-Division Spring Seats are now available for the Subaru Turbo EJ series. The GSC1005 is an OEM replacement stamped spring seat, useable with GSC Power-Division 5043 or 5743 upgraded valve spring kits or stock springs as an alternative to expensive dealership parts. Sold as a set of 16.

GSC Power Division Beehive Valve Spring Kit with Ti Retainer for the DOHC Subaru Turbo EJ Platforms includes 16 titanium retainers and 16 beehive valve springs. Our beehive spring is made with an ovate wire which utilizes advanced material heat treatment methods for superior load loss capabilities. GSC Power Division Beehive Spring Subaru have the highest level of spring load retention while still maintaining good fatigue throughout the life of the spring. Beehive springs allow for the use of a smaller, lighter retainer allowing for higher RPM and more valve control

• Max RPM: 8,500 RPM
• Max boost: 35 psi

GSC Power Division High Pressure Conical Valve Spring with Ti Retainer for Subaru Turbo EJ Platforms includes 16 titanium retainers, 16 conical valve springs, and 16 chromoly valve spring seats. High RPM and High Boost levels are not a problem on these kits. True conical valve springs are not a new concept and are industry proven to provide several key advantages over traditional spring designs. A major advantage of conical springs vs. traditional cylindrical or beehive springs is the damping and removal of valvetrain harmonics. Of the three designs, conical springs are the front runners in valvetrain harmonic stability. Utilizing a varying coil diameter as well as coil spacing, a conical spring acts as a natural harmonic damper in the transfer of valvetrain shock. This translates to less stress, less wear, and a longer life of the included components. This level of protection is needed in today’s engines being pushed to their physical and mechanical limits by aftermarket modifications. Every GSC conical spring offers a super finished surface treatment to go along with the patented, multi-step heat treatment process. The finished product is an extremely reliable, high-performance spring allowing the users to push higher RPMs, use more aggressive cam profiles, and turn up higher boost pressures.

• Max RPM: 10,000 RPM
• Max boost: 40 psi

GSC Power-Division Dual Conical Valve Spring Kit with Ti Retainer & Chromoly Seats for the Subaru Turbo EJ platforms includes 16 titanium retainers, 16 dual conical valve spring sets, and 16 chromoly valve spring seats. GSC Power Division Dual Conical Spring Subaru Turbo EJ | GSC POWER GSC5074 Dual Conical Valve Spring Kit with Ti Retainer for the Subaru

• Max RPM: 10,000 RPM
• Max boost: 40 psi 

GSC Power-Division High Pressure Conical Valve Spring with Ti Retainer for Subaru Turbo EJ Platforms includes

•  16 Titanium Retainers
• 16 Chromoly Valve Spring Seats. 
• 16 High Pressure Conical Valve Springs

High RPM and High Boost levels are not a problem on these kits. True conical valve springs are not a new concept and are industry proven to provide several key advantages over traditional spring designs. A major advantage of conical springs vs. traditional cylindrical or beehive springs is the damping and removal of valvetrain harmonics. Of the three designs, conical springs are the front runners in valvetrain harmonic stability. Utilizing a varying coil diameter as well as coil spacing, a conical spring acts as a natural harmonic damper in the transfer of valvetrain shock. This translates to less stress, less wear, and a longer life of the included components. This level of protection is needed in today’s engines being pushed to their physical and mechanical limits by aftermarket modifications. Every GSC conical spring offers a super finished surface treatment to go along with the patented, multi-step heat treatment process. The finished product is an extremely reliable, high-performance spring allowing the users to push higher RPM's, use more aggressive cam profiles, and turn up higher boost pressures.

• Max RPM: 10,000 RPM
• Max boost: 50 psi

GSC Power-Division Single Cylindrical Valve Spring with Ti Retainer for the DOHC Subaru Turbo EJ platforms includes 16 titanium retainers and 16 cylindrical valve springs. These round wire springs still have the same high quality attention to detail as our popular beehive kits. The GSC5743 is Nano-peened and batched according to seat pressure within our specs. The lightweight titanium retainers are CNC machined with tolerances and repeatability that are unmatched by other brands. This keeps a consistent seat pressure across the head for ultimate reliability and performance.

• Max RPM: 8,000 RPM
• Max boost: 32 psi

GSC Power Division billet S3 camshafts for the Subaru EJ207 version 7 and above with single AVCS. These camshafts are designed for drag use only, fully built engines with a power range of 750-1,300 WHP and an RPM range of 4,500-9,500. Certain engine modifications are required to utilize the true potential of the S3s: built bottom end (closed deck or sleeved), built/ported head, all supporting fueling upgrades, and aggressive dyno tuning. Upgraded valve springs are required. GSC Power Division S3 Camshaft EJ207

• Cylinder head clearancing required. 
• Please maintain 0.020" (0.5mm) minimum clearance from the cylinder head casting

GSC Power-Division Billet S1 camshafts for the Subaru EJ207 Version 7 and above with single AVCS. These will not drop any low end power, and will create more power and torque across the entire RPM range. Good for stock frame upgraded turbos or up to 500 WHP upgrades. Upgraded valve springs are required.

• Due to the lobe size, head castings may need to be filed down slightly for clearance - Please check during install