Fits select 1990-2006 Eagle Talon, Mitsubishi Eclipse, Galant VR-4, Lancer Evolution, and Plymouth Laser (4G63T). This set of eight GSC Power-Division exhaust valves is engineered to withstand the extreme thermal loads of high-output turbocharged 4G63 engines. Manufactured from a high-performance Super Alloy material, these valves offer superior heat resistance compared to standard stainless steel, making them an essential upgrade for high-boost applications.

Each valve features a chrome-polished finish to reduce friction and carbon buildup on the stem. The 30.5mm head diameter maintains the standard (STD) factory sizing, ensuring compatibility with the original valve seats while providing the structural integrity required for performance builds.

• Manufacturer Part Number: 2005-8
• Material: Super Alloy for extreme temperature durability
• Finish: Chrome polished stems
• Head Diameter: 30.5mm (Standard size)
• Quantity: Full set of 8 exhaust valves
• Compatible with 4G63T 1G/2G DSM and Evo 1-9 cylinder heads

Fits select 1990-2006 Mitsubishi Lancer Evolution, Eclipse, Galant VR-4, Eagle Talon, and Plymouth Laser models equipped with the 4G63T engine.

GSC Power-Division oversized intake valves are engineered to improve airflow and volumetric efficiency in high-performance 4G63T builds. These valves feature a 35mm head diameter, which is a +1mm increase over the factory specification, providing a larger surface area for increased intake charges. Each valve is manufactured with a chrome polished finish to reduce friction, minimize carbon buildup, and optimize flow across the valve head.

• Manufacturer Part Number: 2004-8
• Head Diameter: 35mm (+1mm Oversize)
• Finish: Chrome Polished
• Engine Compatibility: 4G63T 2.0L Turbo
• Quantity: Set of 8 Intake Valves

Vehicle Fitment:

Fits select 1990-2006 Mitsubishi Lancer Evolution, Eclipse, Galant VR-4, Eagle Talon, and Plymouth Laser (4G63T).

GSC Power-Division chrome polished exhaust valves are engineered to handle the increased thermal loads and flow requirements of high-performance 4G63T builds. These valves feature a +1mm oversized head diameter (31.5mm), designed to improve exhaust scavenging and overall volumetric efficiency when used with a performance valve job. The chrome polished finish reduces friction and prevents carbon buildup on the valve face and stem, ensuring consistent seating and durability in both DSM and Evolution cylinder heads.

• Head Diameter: 31.5mm (+1mm Oversize)
• Material: Chrome Polished
• Quantity: Set of 8 Exhaust Valves
• Application: Mitsubishi 4G63T (Evo 1-9 and 1G/2G DSM)
• Manufacturer Part Number: 2003-8

This set replaces worn factory exhaust valves and is ideal for forced induction applications where reliability at high RPM and elevated boost levels is critical.

Fits 1990-2006 Mitsubishi Lancer Evolution, Eclipse, Galant VR-4, Eagle Talon, and Plymouth Laser models equipped with the 4G63 engine.

GSC Power-Division intake valves are engineered to meet the high demands of turbocharged 4G63 engines. These standard-sized (34mm) valves feature a chrome polished finish, which helps reduce carbon buildup on the valve head and minimizes friction in the valve guide for smoother operation and longevity. Precision-machined to exacting tolerances, this set of eight valves provides a reliable replacement or upgrade for factory components during a cylinder head rebuild.

• Part Number: 2002-8
• Head Diameter: 34mm (Standard Size)
• Material: Chrome Polished Steel
• Quantity: Set of 8 Intake Valves
• Direct replacement for 4G63/4G63T cylinder heads

Fits 1992-2007 Mitsubishi Evolution I, II, III, IV, V, VI, VII, VIII, and IX models equipped with the 4G63T engine.

This GSC Power-Division chrome polished intake valve is engineered to meet or exceed factory specifications for the Mitsubishi 4G63T engine. Designed as a high-performance replacement for the standard 34mm head diameter valve, it features a precision-polished finish that helps reduce friction and minimize carbon buildup on the valve face and stem. Whether you are performing a standard cylinder head refresh or building a performance street engine, these valves provide the durability and flow characteristics required for the turbocharged 4G63 platform.

• Head Diameter: 34mm (Standard Size)
• Finish: Chrome Polished
• Quantity: Sold Individually (Single Valve)
• Engine Compatibility: Mitsubishi 2.0L 4G63T
• Manufacturer Part Number: 2002-01

Fits select 1990-2006 Mitsubishi Lancer Evolution, Eclipse, Galant VR-4, Eagle Talon, and Plymouth Laser (4G63T).

GSC Power-Division chrome polished exhaust valves are engineered to withstand the extreme thermal loads and high-RPM demands of the 4G63 turbo engine platform. Each valve is swirl-polished to optimize flow characteristics and minimize carbon buildup on the tulip. These standard (STD) size valves maintain a 30.5mm head diameter, making them a precise replacement for worn factory components during a cylinder head rebuild.

• Engine: 4G63T (Mitsubishi / DSM)
• Head Diameter: 30.5mm (Standard Size)
• Finish: Chrome Polished
• Component Type: Exhaust Valve
• Quantity: Set of 8
• Manufacturer Part Number: 2001-8

Fits 1992-2007 Mitsubishi Evolution I, II, III, IV, V, VI, VII, VIII, and IX (4G63T).

Designed for the extreme thermal loads of turbocharged 4G63T engines, this GSC Power-Division exhaust valve provides a high-strength solution for engine builders and enthusiasts. Each valve features a chrome polished stem to minimize friction and improve wear resistance within the valve guide, ensuring consistent operation under high-RPM and high-boost conditions.

• Head Diameter: 30.5mm (Standard OE Size)
• Material: High-grade alloys with a chrome polished finish
• Engine Compatibility: Mitsubishi 4G63T 2.0L Turbo
• Quantity: Sold individually (Single)
• Manufacturer Part Number: 2001-01

This 30.5mm standard size valve is a direct replacement for worn factory components, offering the precision and durability required for reliable valvetrain performance in Mitsubishi Lancer Evolution models.

This GSC Power-Division valve stem seal kit is specifically engineered for the Ford Mustang Gen 3 Coyote (5.0L) engine. These units feature an innovative integrated spring seat design, which provides a stable, fixed platform for the valve springs while ensuring a precise, reliable seal around the valve stem.

Replacing worn valve stem seals is critical to preventing oil consumption and blue smoke during startup or deceleration. By combining the seal and the spring seat into a single component, GSC simplifies the installation process and eliminates the risk of the seat shifting during high-RPM operation, making these an essential upgrade for both stock refreshes and high-performance valvetrain builds.

• Fits Ford Mustang Gen 3 Coyote (5.0L) engines
• Integrated valve spring seat and seal design for maximum stability
• Prevents oil from entering the combustion chamber through the valve guides
• Complete set of 32 seals for a full engine service
• Manufacturer Part Number: 1102

Fits Ford Mustang models equipped with the 5.0L Coyote engine.

GSC Power-Division (P-D) valve stem seals with integrated spring seats offer a precise, high-performance solution for Ford 5.0L Coyote cylinder heads. These seals are engineered to maintain a tight oil seal on the valve stem while the integrated spring seat ensures the valve spring remains perfectly centered and stable during high-RPM operation.

• Designed specifically for the Ford 5.0L Coyote DOHC engine
• Integrated spring seat design simplifies installation and improves spring alignment
• High-temperature resistant materials for maximum durability and oil control
• Complete set of 32 seals included for a full engine overhaul
• Manufacturer Part Number: 1101

Fits BMW B58, N54, S55, and S58 engines and the 2020-2024 Toyota GR Supra.

GSC Power-Division Viton intake valve stem seals are a critical upgrade for high-performance BMW and Toyota engines. Manufactured from high-grade Viton fluoroelastomer, these seals offer superior heat and chemical resistance compared to standard OEM rubber. They are designed to withstand the extreme thermal cycles of turbocharged engines, preventing the hardening and cracking that lead to oil consumption and smoke during startup and deceleration.

• Material: High-temperature Viton fluoroelastomer
• Direct replacement for factory intake valve stem seals
• Resistant to degradation from high-performance oils and fuel additives
• Ensures precise oil control on the valve stem
• Includes: Set of 12 intake seals
• Manufacturer Part Number: 1090

Fits select 2007-2024 BMW and Toyota models equipped with N54, S55, S58, or B58 engines, including the GR Supra.

These GSC Power-Division exhaust valve stem seals are manufactured from high-grade Viton fluoroelastomer to provide superior heat resistance compared to standard rubber seals. In high-performance and turbocharged applications, exhaust valve stems reach extreme temperatures that can cause lesser materials to harden and crack. Replacing worn seals with these Viton components ensures a tight seal against the valve stem, preventing oil from leaking into the combustion chamber and reducing oil consumption and blue exhaust smoke.

• Material: High-temperature Viton fluoroelastomer
• Engine Compatibility: N54, S55, S58, B58
• Quantity: Set of 12 exhaust seals
• Application: Exhaust valve side only
• Manufacturer Part Number: 1089

Fits Toyota 2JZ and Nissan VR38DETT engines.

This GSC Power-Division (GSC P-D) spring seat kit provides a precision-engineered foundation for your valvetrain, ensuring accurate valve spring installed height and protecting the cylinder head from wear during high-lift or high-RPM operation. These seats are critical for maintaining valvetrain stability in performance builds where factory components may not meet the tolerances required for aftermarket springs.

• Manufacturer Part Number: 1085
• Thickness: 0.060in
• Outer Diameter (OD): 1.085in
• Inner Diameter (ID): 0.725in
• Quantity: Complete set of 24 seats
• Application: Compatible with Toyota 2JZ and Nissan VR38DETT cylinder heads

Designed for high-performance valvetrain builds, this GSC Power-Division spring seat kit fits Toyota 2JZ-GTE and Nissan VR38DETT engines.

These precision-machined spring seats provide a consistent and durable mounting surface for your valve springs, protecting the aluminum cylinder head from damage caused by spring oscillation and heat. At 1mm thick, they are engineered to maintain correct installed height while withstanding the high pressures of aftermarket racing springs.

• Manufacturer Part Number: 1084
• Thickness: 1mm
• Outer Diameter (OD): 27.56mm
• Inner Diameter (ID): 18.4mm
• Quantity: Full set of 24
• Compatibility: Replaces worn OE seats or fits with GSC valvetrain components

Designed for precision valvetrain setup, this GSC Power-Division P-D spring seat kit fits Toyota 2JZ-GTE and Nissan VR38DETT engines. These seats provide a stable, hardened surface between the cylinder head and the valve spring, ensuring correct installed height and protecting the aluminum head casting from spring-induced wear during high-RPM operation.

Each seat is manufactured to exacting tolerances to maintain valvetrain geometry and consistency across all 24 valves. This kit is an essential component when refreshing a cylinder head or installing upgraded performance valve springs.

• Fits Toyota 2JZ-GTE and Nissan VR38DETT engines
• Thickness: 0.5mm
• Outer Diameter (OD): 27.56mm
• Inner Diameter (ID): 18.4mm
• Quantity: Set of 24 seats
• Manufacturer Part Number: 1083

Fits 1993-2007 Dodge Viper models.

Prevent oil consumption and maintain proper valvetrain performance with this set of 20 GSC Power-Division Viton valve stem seals. These seals are engineered to replace worn OE units, providing a precise fit for the high-performance V10 engines found in Gen 1, Gen 2, and Gen 3 Vipers. By utilizing Viton material, these seals offer significantly higher heat resistance and durability compared to standard rubber components, ensuring they remain pliable and effective under extreme operating temperatures.

• Material: High-performance Viton for superior heat resistance
• Quantity: Full set of 20 seals
• Application: Replaces factory valve stem seals for intake and exhaust
• Manufacturer Part Number: 1060

Whether you are performing a routine top-end refresh or a complete engine build, these GSC Power-Division seals provide the oil control necessary to prevent smoke at startup and maintain combustion efficiency.

Maintain precise oil control and protect your combustion chamber with this complete set of GSC Power-Division valve stem seals. Engineered specifically for the Nissan TB48DE engine platform, these 7mm seals are a critical component for any cylinder head refresh or high-performance build.

• Fits Nissan TB48DE (4.8L I6) engines with 7mm valve stems
• Constructed from high-grade Viton for superior heat resistance and chemical durability compared to standard rubber
• Provides a consistent seal to prevent oil from leaking into the intake and exhaust ports
• Resists hardening and cracking under extreme thermal cycles
• Complete set of 24 seals (Full head coverage)
• Manufacturer Part Number: 1054

Maintain precise oil control and prevent blue smoke under high-vacuum and high-boost conditions with this GSC Power-Division Valve Stem Seal set. Engineered specifically for the Nissan RB26DETT engine, these seals provide a reliable barrier between the cylinder head oil supply and the combustion chamber, replacing worn or leaking factory seals during a cylinder head refresh or camshaft installation.

• Direct replacement for Nissan RB26DETT (24-valve) factory valve stem seals.
• Constructed from high-temperature resistant materials to withstand the thermal loads of turbocharged applications.
• Ensures proper lubrication of the valve stem while preventing excess oil from entering the intake and exhaust ports.
• Complete set of 24 seals to cover both intake and exhaust valves.
• Manufacturer Part Number: 1053

Fits 1989-1998 Nissan 240SX models equipped with the SR20DET engine.

Restore your cylinder head's oil control and prevent blue smoke at startup with this GSC Power-Division P-D valve stem seal set. These seals are designed to withstand the high temperatures and pressures of turbocharged SR20DET applications, ensuring a tight seal against the valve stem to prevent oil from leaking into the combustion chamber or exhaust housing. Whether you are performing a routine head refresh or a complete engine rebuild, these components provide the reliability needed for high-performance use.

• Engine Application: Nissan SR20DET
• Compatible with 1989-1998 Nissan 240SX (Base, LE, SE, XE)
• High-temperature resistant construction for forced induction longevity
• Includes full set of intake and exhaust seals
• Manufacturer Part Number: 1052

Fits select 1990-2015 Nissan and Infiniti models including 350Z, Altima, Maxima, Pathfinder, GT-R, G35, and FX35.

Ensure your engine's top-end maintains a perfect seal with this GSC Power-Division P-D valve stem seal set. Manufactured from high-grade Viton, these seals provide significantly better heat and chemical resistance compared to standard rubber OE components. This is critical for performance engines that see elevated combustion temperatures and high-rpm usage, where oil control is paramount to preventing carbon buildup and oil consumption.

These seals are precision-engineered for a 5.5mm valve stem and serve as a direct replacement or upgrade for worn factory seals during a head rebuild or cam installation.

• Manufacturer Part Number: 1050
• Material: High-temperature Viton
• Valve Stem Diameter: 5.5mm
• Application: Intake and Exhaust valve stems
• Direct replacement for factory seals

Fits select 1986-2000 Acura Integra, Honda Civic, CRX, del Sol, and Prelude models.

This GSC Power-Division Viton Valve Stem Seal Kit (MPN 1041) is engineered to provide a superior seal for high-performance and high-temperature cylinder head environments. Manufactured from premium Viton material, these 6.6mm seals offer significantly better heat resistance and longevity compared to standard OEM-style rubber seals. By maintaining a tight seal on the valve stem, this kit prevents oil from leaching into the combustion chamber, effectively eliminating blue smoke at startup and reducing carbon buildup on the valves.

• Manufacturer Part Number: 1041
• Material: High-Temperature Resistant Viton
• Bore Size: 6.6mm
• Compatibility: Honda D16, B18-21, and H23 series engines

Fits select 1990-2015 Acura and Honda vehicles (including Integra, Civic, Accord, RSX, and Prelude) equipped with B, K, and H-series engines. See the fitment table for specific model and trim compatibility.

This GSC Power Division valve stem seal kit is a high-performance upgrade designed for engines demanding superior heat resistance and oil control. Manufactured from high-grade Viton, these seals are engineered to withstand the extreme temperatures and friction common in high-RPM B, K, and H-series builds. Unlike standard rubber seals that can become brittle and leak over time, Viton maintains its flexibility and sealing integrity under harsh conditions.

These 5.5mm seals are a direct fit for the factory valve guides, providing a precise seal on the valve stem to prevent oil from entering the combustion chamber. This kit is essential for refresh builds or when installing aftermarket valves and springs where reliability is paramount.

• Manufacturer Part Number: 1040
• Material: High-temperature Viton
• Valve Stem Diameter: 5.5mm
• Engine Compatibility: Honda/Acura B, K, and H Series
• Quantity: Full set of 16 seals

Maintain precise oil control and protect your engine with the GSC Power-Division Viton 6mm Exhaust Valve Stem Seal Set (MPN 1039). These seals are specifically engineered for Honda B-series, K-series, and H-series engines utilizing a 6mm valve stem. Constructed from high-grade Viton, these seals offer significantly higher heat resistance and durability compared to standard rubber components, making them essential for high-RPM and forced induction applications where exhaust temperatures are extreme.

• Material: High-temperature Viton for superior thermal stability
• Valve Stem Diameter: 6mm
• Position: Exhaust Side
• Compatibility: Fits Honda B-Series, K-Series, and H-Series engines
• Manufacturer Part Number: 1039

By replacing worn or hardened factory seals with GSC Viton seals, you reduce oil consumption and prevent blue smoke during deceleration and startup. These seals are designed to seat securely on the guide, ensuring a reliable seal under the most demanding performance conditions.

Designed for high-performance applications, the GSC Power-Division Viton 5.5mm Valve Stem Seal Set provides superior heat resistance and oil control for the G16E-GTS 3-cylinder engine. These seals are a critical upgrade or replacement when rebuilding the cylinder head for increased boost or track use on the Toyota GR Corolla and GR Yaris.

• High-grade Viton material offers exceptional durability and resistance to extreme combustion temperatures
• Precisely engineered for 5.5mm valve stems to ensure consistent oil metering
• Direct fitment for the 12-valve G16E-GTS cylinder head
• Complete set of 12 seals (includes both intake and exhaust)
• Manufacturer Part Number: 1032

Fits 1988-1995 Toyota Celica and MR2 Turbo models equipped with the 3SGTE engine.

GSC Power-Division (P-D) Viton valve stem seals are an essential upgrade for high-performance 3SGTE cylinder head builds. Unlike standard rubber seals that can become brittle and fail under the extreme thermal stress of a turbocharged engine, these seals are manufactured from high-grade Viton. This material offers superior resistance to heat and chemical degradation, ensuring a long-lasting seal against the valve stem.

Replacing worn valve stem seals with GSC Viton components solves common oil consumption issues, such as blue smoke during cold starts or after idling. These 6mm seals are precision-engineered to maintain the necessary oil film on the valve stem while preventing excess oil from leaking into the intake and exhaust ports.

• Manufacturer Part Number: 1031
• Material: High-temperature Viton
• Valve Stem Size: 6mm
• Engine Compatibility: Toyota 3SGTE
• Full set included for intake and exhaust valves

Fits 1992-2005 Lexus GS300, IS300, SC300, and Toyota Supra (2JZ-GE / 2JZ-GTE).

Maintain precise oil control in your cylinder head with this GSC Power-Division valve stem seal set. Engineered specifically for the Toyota 2JZ engine platform, these seals are manufactured from high-grade Viton. This material offers significantly better heat resistance and durability than standard OEM rubber, making them essential for high-performance builds, turbocharged applications, or standard refreshes where longevity is a priority.

This complete set provides a reliable seal against the 6mm valve stems, preventing oil consumption and blue smoke caused by worn or hardened factory seals. Whether you are performing a top-end rebuild or installing new camshafts, these seals ensure your valvetrain remains clean and efficient.

• Manufacturer Part Number: 1030
• Material: High-temperature Viton
• Stem Diameter: 6mm
• Compatibility: All 2JZ-GE and 2JZ-GTE engines

Fits Toyota 2JZ engines. This GSC Power-Division exhaust valve guide seal kit is engineered to provide superior oil control and thermal stability for high-performance 2JZ cylinder heads. These seals are specifically designed for the exhaust side, where temperatures are most extreme.

Constructed from high-grade Viton, these 6.6mm seals offer significantly better resistance to heat and chemical degradation than standard rubber alternatives. This ensures a consistent seal over the valve stem, preventing oil from leaking into the exhaust ports—a common cause of smoke and carbon buildup in performance applications.

• Manufacturer Part Number: 1029
• Material: High-temperature Viton
• Valve Stem Diameter: 6.6mm
• Application: Exhaust side only
• Quantity: Set of 12 seals

Fits Toyota 2JZ engines (GE/GTE). Maintain proper oil control and prevent blue smoke on startup or deceleration with this GSC Power-Division (P-D) 6mm Viton valve seal kit. These seals are engineered from high-grade Viton to withstand the extreme temperatures common in turbocharged 2JZ-GTE or high-revving 2JZ-GE cylinder heads.

Unlike standard rubber components that become brittle over time, Viton remains pliable and effective even after prolonged exposure to high-heat cycles and synthetic oils, ensuring a tight seal against the 6mm valve stem. This kit is a critical upgrade for high-performance builds or as a reliable replacement for worn-out factory seals during a top-end refresh.

• Material: High-temperature resistant Viton
• Valve Stem Diameter: 6mm
• Quantity: Set of 12 seals
• Engine Compatibility: Toyota 2JZ-GE and 2JZ-GTE
• Manufacturer Part Number: 1028

Fits Subaru FA20 and FA20DIT engines.

Maintain peak performance and prevent oil consumption with the GSC Power-Division Viton Valve Stem Seal Set. Engineered specifically for the Subaru FA20 platform, these seals are a critical component for any cylinder head refresh or performance engine build. By using high-grade Viton instead of standard rubber, these seals provide superior resistance to the extreme temperatures and chemicals common in high-output and turbocharged environments.

These 5.5mm seals ensure a tight, reliable fit on the valve stem, preventing oil from leaking into the combustion chamber or exhaust port, which helps eliminate blue exhaust smoke and carbon buildup on valves.

• Material: High-temperature Viton for maximum durability
• Stem Size: 5.5mm
• Application: Subaru FA20 / FA20DIT engines
• Quantity: Complete engine set
• Manufacturer Part Number: 1023

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

GSC Power-Division valve stem seals are engineered to withstand the extreme temperatures and high-lift environments of performance-built Subaru engines. These seals are manufactured from Viton, a high-temperature fluoroelastomer that maintains its flexibility and sealing integrity far longer than standard rubber seals, which often become brittle and crack. Replacing your seals with GSC Viton components prevents oil from seeping down the valve guides into the combustion chamber, eliminating blue smoke and carbon buildup on the valves.

• Manufacturer Part Number: 1022
• Material: High-temperature Viton
• Valve Stem Diameter: 6mm
• Engine Compatibility: Subaru EJ205, EJ207, EJ257
• Included: Complete set for one engine

Fits 2006-2015 Mitsubishi Lancer Evolution and Ralliart models.

The GSC Power-Division P-D Valve Stem Seal Set is engineered to provide superior oil control for your Mitsubishi cylinder head. These seals are designed to withstand the extreme thermal loads found in high-performance turbocharged applications, preventing oil from seeping down the valve guides into the combustion chamber. Replacing worn seals is critical for reducing oil consumption, preventing blue smoke at startup, and keeping your intake and exhaust valves free of efficiency-robbing carbon deposits.

• Complete set of 16 seals for intake and exhaust valves
• High-temperature resistant materials for long-term durability in 4B11T and 4G63 applications
• Direct replacement for factory OE valve stem seals
• Manufacturer Part Number: 1010

Vehicle Fitment:

• 2006 Mitsubishi Lancer Evolution (MR, RS, SE)
• 2009-2015 Mitsubishi Lancer Ralliart
• 2010-2011 Mitsubishi Lancer Ralliart Sportback