GSC Power Division B2012-50 STD Intake Valves 36mm for Subaru EJ205/EJ207/EJ257

Vehicle Fitment

• 2002-2014 Subaru Impreza WRX (EJ205 / EJ255, 2.0L-2.5L DOHC Turbo, AWD)
• 2004-2021 Subaru Impreza WRX STi (EJ207 / EJ257 / EJ257B, 2.0L-2.5L DOHC Turbo, AWD)
• 2004-2013 Subaru Forester XT (EJ255, 2.5L DOHC Turbo, AWD)
• 2005-2012 Subaru Legacy GT (EJ255, 2.5L DOHC Turbo, AWD)
• 2004-2006 Subaru Baja Turbo (EJ255, 2.5L DOHC Turbo, AWD)

Fitment Notes

• Fits all Subaru turbocharged EJ-series engines sharing the standard 36mm intake valve seat diameter, including EJ205, EJ207, EJ255, EJ257, and EJ257B across all AVCS and non-AVCS configurations
• Standard (STD) 36mm head diameter - confirm existing intake valve seat diameter before installation; use oversized valves (GSC part 2014-8 / B2014-50) if seats have been previously cut to +1mm
• B2012-50 is the bulk pack (set of 50 valves) equivalent of retail part number GSC2012-8 - same valve, same specifications, sold in higher quantity for shop/dealer use
• Covers 6.25 complete engine sets of 8 intake valves - ideal for engine builders and shops performing multiple EJ head builds

Features

• Modified 21-4N stainless steel alloy construction provides excellent strength, heat resistance, and long-term durability across the full range of turbocharged EJ applications from street to high-output builds
• Micro polished valve stems minimize oil retention and reduce drag against the valve guide, ensuring smooth, consistent motion across the full RPM range
• Swirl polished valve heads optimize intake charge airflow across the valve face, improving combustion efficiency and supporting peak power output
• Back-cut head design reduces valve mass, enabling higher RPM capability, increased boost pressure tolerance, and compatibility with aggressive cam profiles without raising valve spring seat pressures
• Maximized under-head dish removes additional mass while preserving full structural integrity under sustained high-temperature and high-pressure conditions
• Precision-adjusted valve tip lengths minimize tipping requirements during installation, maintaining correct valvetrain geometry and reducing lash setup time
• Engineered keeper groove geometry balances intake and exhaust spring pressures, reducing reliance on valve spring shims and optimizing performance from GSC spring and retainer kits
• Valve tips hardened or stellite-tipped to within 5 Rockwell C of the rocker or tappet contact surface for extended tip life and reduced wear
• Less face distortion under extreme conditions than competing tested designs, enabling superior sealing and consistent performance throughout the valve service life
• Designed, machined, and flow tested in-house on CNC machining centers using advanced 3D FEA and real-world flow simulation validated in the specific EJ application

Specifications

• Position: Intake (set of 50 - bulk pack for shop/dealer use)
• Valve Head Diameter: 36.00mm (STD / Standard Size)
• Valve Stem Diameter: 6.0mm
• Overall Valve Length: 104.40mm
• Material: Modified 21-4N stainless steel
• Stem Finish: Micro polished
• Head Finish: Swirl polished with back cut; maximized under-head dish
• Application Engines: Subaru EJ205, EJ207, EJ255, EJ257, EJ257B (2.0L-2.5L DOHC Turbocharged Flat-4)
• Quantity per Pack: 50 (equivalent to 6.25 sets of 8)
• Retail Set Equivalent: GSC2012-8

Included Components

• 50x GSC Power Division 21-4N STD Chrome Polished Intake Valves (36.00mm head, 6.0mm stem, 104.40mm length)

Product Description

The GSC Power Division B2012-50 is the bulk pack version of the standard EJ-series intake valve, supplying 50 pieces of the proven GSC2012 STD (36mm) chrome polished intake valve for the Subaru turbocharged EJ engine family. This bulk format is designed for engine builders, machine shops, and dealers who routinely perform head rebuilds on WRX, STi, Forester XT, Legacy GT, and Baja Turbo platforms using EJ205, EJ207, EJ255, EJ257, or EJ257B engines - providing per-valve cost savings and a ready inventory for high-volume work. The valve itself is identical in specification to the retail GSC2012-8 set: same modified 21-4N stainless material, same 36mm standard head diameter, same 6.0mm stem, and the same 104.40mm overall length.

GSC's EJ intake valves are engineered with the same core design philosophy as the rest of their valve lineup: micro polished stems for reduced guide drag, swirl polished and back-cut heads for improved flow and reduced mass, precision-adjusted tip lengths for easier valve lash setup, and an engineered keeper groove geometry that balances spring pressures across the valvetrain. The result is a valve that delivers measurably better performance over the OEM part from the first installation - lower face distortion under heat and pressure, better sealing consistency, and a designed-in compatibility with GSC's EJ beehive valve spring and retainer kits without requiring spring shim adjustments.

At the standard 36mm head diameter, the B2012-50 is a direct-fit replacement for any EJ turbo cylinder head that has not had its intake valve seats previously cut for oversized valves. For heads requiring +1mm oversized seats (37mm), the GSC B2014-50 bulk pack is the correct choice. Each pack of 50 covers 6 full engine sets of 8 with 2 valves to spare, making it an efficient stocking unit for shops building multiple EJ engines. For a complete intake-side valvetrain rebuild, GSC recommends pairing with their stopper-style intake valve guides (GSC3026), Viton valve stem seals (GSC1022), and OEM-replacement keeper set (GSC1006).