Fits select Subaru EJ205, EJ207, EJ257, EJ257B, and SOHC EJ engines.

Maintain valvetrain integrity with the GSC Power-Division Valve Keeper Set. These precision-machined valve locks are critical for securing the valve spring retainer to the valve stem, ensuring stable operation even under the stresses of high-performance use. A worn or improperly seated keeper can lead to catastrophic engine failure; these GSC components provide the exact tolerances required for a secure lock.

This set of 32 keepers is specifically designed for Subaru EJ-series 16-valve engines, providing two keepers per valve for a complete engine overhaul or valvetrain upgrade. Whether you are refreshing a daily driver or building a high-boost EJ257, these keepers offer the reliability needed for professional engine assembly.

• Precision machined for consistent fitment and valve stem engagement
• Compatible with EJ205, EJ207, EJ257, EJ257B, and SOHC EJ platforms
• Ideal for use with GSC retainers or as high-quality replacements for OE hardware
• Quantity: Set of 32 (Full engine set for 16 valves)
• Manufacturer Part Number: 1006

Fits select 1999-2015 Subaru Impreza and WRX STI, and 2005 Saab 9-2X (EJ205 / EJ207 / EJ257).

GSC Power Division P-D OEM Replacement Valve Spring Seats are precision-engineered to restore your valvetrain to factory specifications. These seats are essential when refreshing a cylinder head or upgrading to high-performance valve spring kits, such as GSC Beehive springs. They provide a fresh, flat mating surface that protects the aluminum cylinder head from spring wear while maintaining the exact seat thickness of the original factory components.

• Manufacturer Part Number: 1005
• Direct Replacement: Replaces worn or damaged factory valve seats
• Compatibility: Designed specifically for EJ205, EJ207, and EJ257 engine platforms
• OEM Standards: Manufactured to the same thickness as original equipment for proper spring installed height
• Material: Durable steel construction for long-term valvetrain stability

Fitment:

• 2005 Saab 9-2X Aero
• 2002-2014 Subaru Impreza WRX
• 2004-2015 Subaru WRX STI
• 1999-2011 Subaru Impreza (Base, RS, L, Outback Sport, 2.5i)
• 2012-2014 Subaru Impreza (Base, Limited, Premium, Sport)

Fits select 1990-2006 Mitsubishi Eclipse, Lancer Evolution, Galant VR-4, Eagle Talon, and Plymouth Laser models.

Maintain proper valve spring geometry and protect your cylinder head with these GSC Power-Division OEM-style replacement valve spring seats. These components are essential when refreshing a high-mileage cylinder head or upgrading to high-performance valve springs like the GSC Beehive series. Precision-manufactured to match factory tolerances, these seats provide a stable, level base for the valve springs, preventing head wear and ensuring consistent spring pressure across the entire valvetrain.

• Direct OEM-style replacement for factory 4G63T valve spring seats
• Provides a stable mounting surface for high-performance and beehive valve springs
• Essential for cylinder head rebuilds and valvetrain maintenance
• Precision manufactured for exact fitment and longevity
• Includes a full set of 16 seats
• Manufacturer Part Number: 1004

Fits 1990-2006 Mitsubishi Lancer Evolution, Eclipse, Galant VR-4, Eagle Talon, and Plymouth Laser with 4G63T engines.

GSC Power-Division valve keepers are precision-engineered components designed to securely lock the valve spring retainer to the valve stem. For high-performance builds involving high-lift camshafts or increased RPM limits, replacing worn OE keepers with a fresh set of GSC precision locks ensures valvetrain stability and helps prevent valve float or lock failure. This complete set includes 32 keepers, providing a full replacement for a 16-valve 4G63T cylinder head.

• Precision machined to exacting tolerances for superior fitment
• Direct replacement for factory keepers in high-performance applications
• Essential for maintain valvetrain integrity at high RPMs
• Manufacturer Part Number: 1003
• Quantity: Set of 32

Maintain precise oil control and cylinder head integrity with the GSC Power-Division Viton 6.6mm Valve Stem Seal Set. Fits select 1990-2006 Mitsubishi Lancer Evolution, Eclipse, Galant VR-4, Eagle Talon, and Plymouth Laser models equipped with the 4G63T engine.

These seals are manufactured from high-grade Viton, a synthetic rubber known for its exceptional thermal stability and resistance to chemical degradation. In high-performance 4G63T builds where increased boost and elevated exhaust gas temperatures (EGTs) are common, Viton provides a significantly more durable solution than standard nitrile or polyacrylate seals. These seals ensure a tight fit against the valve stem to prevent oil from entering the combustion chamber through the guides, reducing smoke and carbon buildup.

• Material: High-temperature Viton synthetic rubber
• Stem Diameter: 6.6mm
• Application: 16-valve 4G63T engines
• Kit Contents: Full engine set
• Manufacturer Part Number: 1002