Designed specifically for the Subaru EJ series engine, the GSC Power-Division Dual Conical Valve Spring Kit (MPN 5074) provides the valvetrain stability required for high-performance and high-RPM builds. This kit addresses the inherent harmonic challenges of the EJ platform by utilizing a specialized dual conical geometry.

The dual conical design offers progressive damping characteristics that significantly reduce harmonic resonance compared to traditional cylindrical springs. This ensures more consistent seat pressure and prevents valve float, protecting your engine during aggressive cam profiles or high-boost applications. By minimizing top-end mass while maintaining superior control, these springs allow for a higher rev limit and improved valvetrain longevity.

• Fits all Subaru EJ series engines
• Dual conical spring geometry for superior harmonic damping
• Increased seat pressure to prevent valve float at high RPM
• Engineered for high-performance street and track applications
• Manufacturer Part Number: 5074

The GSC Power-Division 5073 Single Conical Valve Spring Kit is engineered for Subaru EJ-series engines requiring improved valvetrain stability and high-RPM reliability. By utilizing a conical spring design, this kit reduces reciprocating mass at the retainer end and provides superior harmonic damping compared to traditional straight-wound springs.

This comprehensive upgrade includes lightweight, precision-machined titanium retainers to minimize valvetrain inertia, allowing for faster engine response and increased protection against valve float in high-performance applications. The included spring seats ensure correct installed height and alignment for a precise fitment.

• Fits Subaru EJ engines (EJ20/EJ25)
• Single conical spring design for reduced harmonics and reciprocating mass
• Precision-machined titanium retainers for maximum weight savings
• Includes dedicated spring seats for proper installation
• Manufacturer Part Number: 5073

Designed for high-performance Toyota 3SGTE engines, the GSC Power-Division High Pressure Conical Valve Spring Kit (5071) provides the necessary seat pressure and valvetrain stability for high-boost and high-RPM applications. This kit is specifically engineered for engines utilizing shimless or shim-over bucket configurations.

The conical spring design offers superior harmonic dampening compared to traditional cylindrical springs while reducing the reciprocating mass at the retainer end. This allow for a lighter titanium retainer and improved valve control during rapid lift cycles, preventing destructive valve float.

• High-pressure conical valve springs for increased RPM capability
• Lightweight CNC-machined Titanium retainers
• Compatible with shimless and shim-over bucket lifters
• Engineered for high-boost 3SGTE cylinder heads
• Manufacturer Part Number: 5071

Engineered for high-performance Nissan VR38DETT builds, the GSC Power-Division 5069 High Pressure Conical Valve Spring Kit provides the valvetrain stability necessary for high-boost and high-RPM applications. The conical spring design offers superior damping characteristics and reduced oscillating mass compared to traditional cylindrical springs, preventing valve float and ensuring consistent performance under extreme conditions.

This kit replaces the factory valvetrain components with high-seat-pressure springs capable of handling aggressive camshaft profiles and increased manifold pressure. The included precision-machined titanium retainers significantly reduce reciprocating weight, allowing for faster engine response and increased reliability at the rev limit.

• Specifically designed for the Nissan VR38DETT engine
• High-pressure conical spring architecture for improved harmonics
• Lightweight titanium retainers reduce valvetrain mass
• Prevents valve float in high-boost applications
• Manufacturer Part Number: 5069

Fits Nissan VR38DETT engines.

The GSC Power-Division Conical Valve Spring Kit is engineered to provide superior valvetrain stability and harmonics control for high-performance VR38DETT builds. Utilizing the advanced TVS1903 conical spring design, this kit reduces the oscillating mass at the retainer end, allowing for higher RPM limits and improved valve control compared to traditional cylindrical springs. This design offers the high-lift capabilities and seat pressure required for forced induction applications while maintaining a compact, lightweight profile.

• Engineered specifically for the Nissan VR38DETT valvetrain
• Includes TVS1903 series conical valve springs
• Conical geometry reduces top-end weight and improves harmonic damping
• Compatible with high-lift camshaft profiles
• Manufacturer Part Number: 5068

The GSC Power-Division conical valve spring and titanium retainer kit is engineered to provide superior valvetrain stability for the Toyota 3SGTE engine. This kit (MPN: 5067) utilizes a conical spring design that allows for a smaller, lighter titanium retainer, significantly reducing the reciprocating mass of the valvetrain while effectively managing harmonics at high RPM.

• Specifically designed for Toyota 3SGTE applications.
• Compatible with both shim-over-bucket and shimless bucket configurations.
• Conical spring geometry improves dampening and increases RPM potential.
• CNC-machined titanium retainers provide high strength and minimal weight.
• Includes a complete set of conical valve springs and titanium retainers.
• Manufacturer Part Number: 5067

Fits Toyota 2JZ-GTE engines.

This GSC Power-Division Single Conical Valve Spring and Titanium Retainer Kit is engineered to provide superior valvetrain control for high-performance Toyota 2JZ-GTE builds. The conical spring design effectively dampens harmonic vibration and allows for the use of a smaller, lighter titanium retainer. By significantly decreasing reciprocating mass at the valve, this kit enables higher RPM limits and more stable valve operation when running aggressive camshaft profiles.

• Direct fit for Toyota 2JZ-GTE engines
• Conical spring design reduces harmonic oscillation and spring surge
• Lightweight CNC-machined titanium retainers for reduced valvetrain mass
• Increased stability for high-lift and high-RPM applications
• Includes a complete set of springs and retainers
• Manufacturer Part Number: 5066

Engineered for high-performance Toyota 2JZ-GE and 2JZ-GTE engines, the GSC Power-Division 5064 Conical Valve Spring and Titanium Retainer Kit provides the valvetrain stability required for high-RPM and high-boost applications. The conical spring design reduces the reciprocating mass at the retainer end of the spring, which improves harmonic damping and allows for higher engine speeds without valve float.

• Fits Toyota 2JZ engines (2JZ-GE / 2JZ-GTE)
• Conical spring geometry for reduced valvetrain mass and superior harmonic control
• Includes CNC-machined aerospace-grade Titanium retainers for maximum strength and weight savings
• Designed to handle increased lift and cylinder pressures in modified builds
• Direct replacement for OE valvetrain components
• Manufacturer Part Number: 5064

Fits Mitsubishi 4B11T engines, including the Evolution X and Lancer Ralliart.

The GSC Power-Division 5062 High Pressure Single Conical Valve Spring and Titanium Retainer Kit is engineered for high-performance 4B11T builds that require increased seat pressure to manage higher boost levels and extended RPM ranges. By replacing the factory valve springs, this kit prevents valve float and ensures stable valvetrain operation under extreme engine loads.

The conical spring design provides superior harmonic damping compared to traditional straight-rate springs, while the lightweight titanium retainers reduce reciprocating mass for faster engine response. This combination allows for a more aggressive cam profile and higher redline without compromising valvetrain integrity.

• Engineered specifically for the Mitsubishi 4B11T engine
• High-pressure single conical spring design for improved harmonics
• Lightweight Titanium (Ti) retainers for increased valvetrain stability
• Critical for high-boost and high-RPM applications
• Manufacturer Part Number: 5062

Fits 2013-2017 Scion FR-S, Subaru BRZ, and Toyota 86 (FA20).

The GSC Power-Division Single Beehive Valve Spring Kit is engineered to provide superior high-RPM stability and valve control for the FA20 engine platform. By utilizing a beehive spring profile, this kit significantly reduces reciprocating mass at the retainer end, which helps dampen harmonic vibrations and prevents valve float during aggressive driving or high-lift cam applications.

This comprehensive kit includes lightweight titanium retainers for maximum strength-to-weight performance and hardened chromoly spring seats to ensure long-term durability and protect the cylinder head from spring wear. Each component is manufactured to strict tolerances to ensure a precise fit and reliable operation in performance-built engines.

• Manufacturer Part Number: 5056
• Beehive spring design for reduced mass and improved harmonics
• Lightweight Titanium retainers for high-RPM valvetrain stability
• Hardened Chromoly spring seats included
• Direct fit for the 2.0L FA20 engine

Fits select 2001-2015 Nissan and Infiniti models including 350Z, Altima, Maxima, Murano, Pathfinder, Quest, FX35, G35, I35, JX35, M35, QX4, and QX60 (VQ35DE).

The GSC Power-Division 5053 Beehive Valve Spring and Titanium Retainer Kit is specifically engineered for high-performance VQ35DE engines running high-boost turbo setups and increased RPM limits. The beehive spring architecture reduces valvetrain harmonics and provides better clearance for high-lift camshafts compared to standard cylindrical springs. Paired with precision-machined titanium retainers, this kit significantly reduces reciprocating mass to ensure stable valve operation and prevent engine-damaging valve float at high engine speeds.

• Optimized for Turbo High Rev VQ35DE applications
• Beehive spring profile for superior harmonic dampening and clearance
• Lightweight titanium retainers reduce valvetrain mass for high-RPM stability
• Ensures consistent valve control under high boost conditions
• Complete kit for comprehensive cylinder head upgrades
• Manufacturer Part Number: 5053

Fits 1989-1998 Nissan 240SX Base, LE, SE, and XE models equipped with SR20 engines.

The GSC Power-Division Single Valve Spring and Titanium Retainer Kit (MPN 5051) is a critical upgrade for enthusiasts looking to improve valvetrain stability and high-RPM reliability. Designed specifically for the Nissan SR20 platform, this kit replaces worn factory components to mitigate valve float and ensure precise valve timing during high-performance use.

• Includes high-seat-pressure single valve springs and lightweight titanium retainers
• Titanium retainers reduce reciprocating mass for improved valvetrain response
• Provides the necessary spring rate to support aggressive camshaft profiles and higher boost levels
• Direct replacement for OE valvetrain components in SR20 cylinder heads
• Manufacturer Part Number: 5051

Fits Honda K-Series K20 and K24 VTEC engines.

The GSC Power-Division Beehive Valve Spring and Titanium Retainer Kit (5047) is engineered to provide the valvetrain stability required for high-RPM operation and aggressive camshaft profiles. By utilizing a beehive spring design, this kit reduces the reciprocating mass of the valvetrain and offers superior harmonic dampening compared to traditional cylindrical springs. These components are essential for preventing valve float and ensuring long-term reliability in high-performance K-series builds.

• Advanced beehive spring geometry reduces active mass for improved high-RPM control
• CNC-machined titanium retainers offer maximum strength with minimal weight
• Designed specifically for Honda K20 and K24 VTEC valvetrain architectures
• Provides increased seat pressure and lift capacity for aftermarket camshafts
• Manufacturer Part Number: 5047
• Includes a complete set of valve springs and titanium retainers

Fits 2010-2014 Hyundai Genesis Coupe (2.0T).

The GSC Power-Division Beehive Valve Spring and Titanium Retainer Kit is engineered to provide the valvetrain stability necessary for high-performance G4KF Theta engines. By replacing the heavy factory components with this precision-matched set, you reduce reciprocating mass and improve harmonic resistance at high RPM. The beehive spring profile allows for a smaller, lighter retainer, while the titanium construction ensures maximum strength without the weight of steel, effectively preventing valve float in high-boost or high-revving applications.

• Engineered specifically for the Hyundai G4KF Theta engine
• Beehive spring design reduces mass and improves valvetrain harmonics
• Lightweight titanium retainers for superior strength-to-weight ratio
• Prevents valve float and ensures reliable seat pressure
• Manufacturer Part Number: 5046

Fits 1993-1998 Toyota Supra Twin Turbo models.

The GSC Power-Division (5044) Beehive Valve Spring and Titanium Retainer kit is designed to improve valvetrain stability and increase the RPM ceiling of the 2JZ platform. The beehive spring profile reduces reciprocating mass at the retainer, which helps mitigate valvetrain harmonics and allows for more aggressive cam profiles. Paired with lightweight, precision-machined titanium retainers, this kit provides the durability required for high-performance street and track builds.

Technical Note: Please verify the fitment of the spring base on your specific cylinder head before installation to ensure proper seating and component clearance.

• Manufacturer Part Number: 5044
• Spring Design: Beehive profile for reduced mass and harmonic control
• Retainer Material: High-strength Titanium
• Application: 1993-1998 Toyota Supra Twin Turbo (2JZ-GTE)
• Includes: Complete set of valve springs and titanium retainers

Fits select 1999-2015 Subaru Impreza, WRX, and STI models, and the 2005 Saab 9-2X Aero. This GSC Power-Division Beehive Valve Spring and Titanium Retainer Kit is engineered to enhance valvetrain stability in DOHC Turbo EJ platforms. By utilizing a beehive spring profile, this kit reduces reciprocating mass and improves harmonic resistance compared to traditional cylindrical springs, allowing for higher RPM potential and increased reliability under boost.

This kit is specifically designed to be used with the factory (OE) spring seats, simplifying the installation process while providing a significant upgrade in valve control. The included titanium retainers are CNC-machined for precision fitment and maximum weight savings without sacrificing durability.

• Fits DOHC Subaru Turbo EJ platforms
• Beehive spring design for improved harmonics and reduced weight
• Lightweight titanium retainers for faster engine response
• Designed for use with original equipment (OE) spring seats
• Includes 16 beehive valve springs and 16 titanium retainers
• Manufacturer Part Number: 5043

Fits select 2006-2015 Mitsubishi Lancer Evolution and Ralliart models (4B11T).

The GSC Power-Division Beehive Valve Spring and Titanium Retainer kit is engineered to provide superior valvetrain stability and increased RPM potential for the Mitsubishi 4B11T engine. By utilizing a beehive shape, these springs reduce reciprocating mass compared to traditional cylindrical designs while offering improved harmonic resistance. Each kit includes lightweight Grade 5 Titanium retainers designed to withstand the rigors of high-lift camshafts and high-boost environments.

This kit is designed for a drop-in installation using your factory OE spring seats, simplifying the upgrade process while maintaining precise seat pressure. It is an essential upgrade for built engines and high-performance street applications looking to prevent valve float.

• Manufacturer Part Number: 5042
• Spring Type: Beehive for reduced valvetrain mass
• Retainer Material: Lightweight Titanium
• Compatibility: Designed for use with OE spring seats
• Application: Mitsubishi 4B11T engines

Fits select 1990-2006 Mitsubishi Lancer Evolution, Eclipse, Galant VR-4, Eagle Talon, and Plymouth Laser (4G63).

The GSC Power-Division Beehive Valve Spring and Titanium Retainer Kit is designed to improve valvetrain stability and increase RPM potential in high-performance 4G63 engines. By utilizing a beehive spring profile, this kit reduces reciprocating mass and offers superior harmonic resistance compared to standard cylindrical springs. This design allows for higher lift and better valve control under extreme boost and high-revving conditions.

Each kit includes precision-engineered titanium retainers, which significantly reduce weight compared to factory steel units, further minimizing valvetrain inertia and protecting against valve float.

• Manufacturer Part Number: 5040
• Engine Compatibility: Mitsubishi 4G63 (Evolution 1-9 / DSM)
• Spring Style: Beehive
• Retainer Material: Lightweight Titanium
• Applications: Supports high-lift camshafts and high-RPM operation

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

The GSC Power-Division Stage 1 Beehive Valve Springs (MPN 5039) are engineered to improve valvetrain stability and handle the increased demands of performance camshafts. These springs utilize a beehive design, which reduces the moving mass of the spring and provides better harmonic dampening compared to traditional cylindrical springs. This results in a valvetrain that can safely sustain higher RPMs without the risk of valve float.

Designed as a direct-fit upgrade, these Stage 1 springs are specifically manufactured to work with your engine's factory retainers and spring seats, simplifying the installation process while providing a significant boost in reliability over aged OE components.

• Manufacturer: GSC Power-Division
• Series: Stage 1 Beehive
• Part Number: 5039
• Compatibility: Replaces factory valve springs; uses OEM retainers and seats
• Engine Fitment: Mitsubishi 2.0L 4G63T

The GSC Power-Division high-pressure shimless conical valve spring and titanium retainer kit (MPN 5026) is engineered for high-performance Nissan RB26DETT builds requiring extreme valvetrain stability. This kit is specifically designed to manage high manifold pressures, rated for applications running up to 60 PSI of boost.

By utilizing a conical spring profile, this kit reduces the oscillating mass of the retainer and the upper portion of the spring. This reduction in weight allows for improved engine response and higher RPM potential while maintaining the seat pressure necessary to prevent valve float under heavy boost. The shimless design facilitates a more direct installation on the RB26 cylinder head, ensuring precise tolerances for aggressive camshaft profiles.

• Compatible Engine: Nissan RB26DETT
• Spring Type: High-Pressure Shimless Conical
• Retainer Material: Lightweight Aerospace-Grade Titanium
• Maximum Rating: Up to 60 PSI Boost
• Manufacturer Part Number: 5026

Each kit includes a complete set of high-pressure conical springs and matching titanium retainers to provide a comprehensive valvetrain upgrade for forced induction setups.

Fits Audi R8 and Lamborghini Huracan models equipped with the V10-5.2L engine.

The GSC Power-Division Valve Spring and Titanium Retainer Kit (MPN 5025) is engineered for high-performance 5.2L V10 builds requiring superior valvetrain stability. This kit replaces the factory components with high-tension springs and lightweight titanium retainers, significantly reducing reciprocating mass to prevent valve float at high RPMs and under increased boost levels.

• 6AL4V Titanium retainers for maximum weight savings and durability.
• High-quality valve springs designed for increased lift and seat pressure.
• Includes hardened steel spring seats to protect the cylinder head.
• Supplied with premium Viton valve seals for a complete installation.
• Designed as a direct fit for the Audi and Lamborghini 5.2L V10 platform.
• Manufacturer Part Number: 5025

Fits 2022+ Subaru WRX models equipped with the FA24F engine.

Engineered for high-performance applications, the GSC Power-Division 5024 kit provides the valvetrain stability required for increased boost levels and higher RPM limits. This kit utilizes a conical spring design, which offers superior natural frequency damping over traditional cylindrical springs. This geometry reduces valvetrain vibration and allows for the use of a smaller, lighter titanium retainer to minimize reciprocating mass.

• High-pressure conical spring geometry for improved harmonic damping
• Lightweight Grade 5 Titanium retainers for reduced valvetrain mass
• Designed to prevent valve float in high-RPM and high-boost environments
• Direct fit for the FA24F engine platform
• Manufacturer Part Number: 5024

Fits BMW S58 engines found in high-performance G-series M3/M4 and F-series X3M/X4M models.

The GSC Power-Division Beehive Valve Spring and Titanium Retainer Kit (MPN 5023) is engineered for S58 owners pushing the limits of forced induction. Rated for applications running up to 70 PSI of boost, this kit provides the essential valvetrain stability required to prevent valve float under extreme cylinder pressures. The beehive spring geometry reduces active mass and improves harmonic resistance compared to traditional cylindrical springs, allowing for more consistent valve control at high RPMs.

• Designed specifically for the BMW S58 engine platform
• Tested and rated for high-boost applications up to 70 PSI
• Includes lightweight Titanium (Ti) retainers to minimize valvetrain inertia
• Beehive spring profile for superior harmonic damping and RPM stability
• Manufacturer Part Number: 5023

Designed for the 2022+ Subaru WRX equipped with the FA24F engine, the GSC Power-Division Conical Valve Spring and Titanium Retainer Kit (MPN: 5021) provides the valvetrain stability required for high-RPM performance and forced induction builds. This kit replaces the factory spring and retainer assembly to ensure consistent valve control under increased boost and lift.

The conical spring design is engineered to reduce parasitic mass and dampen harmful harmonics more effectively than traditional cylindrical springs. By pairing these with lightweight Grade 5 titanium retainers, this kit significantly reduces reciprocating valvetrain weight, allowing for improved engine response and a safer high-RPM ceiling.

• Fits 2022+ Subaru WRX (FA24F engine)
• Conical spring profile for superior harmonic damping and reduced mass
• Precision-machined titanium retainers for maximum weight savings
• Ideal for builds requiring higher lift and increased RPM stability
• Complete kit including all necessary springs and retainers
• Manufacturer Part Number: 5021

The GSC Power-Division Conical Valve Spring and Titanium Retainer Kit is engineered specifically for the high-performance Toyota G16E-GTS 3-cylinder engine found in the GR Yaris and GR Corolla. This kit addresses the valvetrain stability issues common when pushing the G16E to higher RPM ranges and increased boost levels.

By utilizing a conical spring profile, GSC reduces the reciprocating mass of the valvetrain while improving harmonic damping compared to standard cylindrical springs. This design allows for a higher natural frequency, significantly reducing the risk of valve float and spring surge. The included CNC-machined titanium retainers offer exceptional strength with minimal weight, ensuring precise valve control under the most demanding racing conditions.

• Fits 2020+ Toyota GR Yaris and 2023+ Toyota GR Corolla (G16E-GTS)
• Conical spring design reduces mass and improves valvetrain harmonics
• Lightweight aerospace-grade titanium retainers for reduced reciprocating weight
• Increased seat pressure to support high-boost applications
• Complete set of springs and retainers included
• Manufacturer Part Number: 5017

Optimized for the high-revving Ford 5.2L Voodoo and Predator engines, the GSC Power-Division P-D Conical Valve Spring and Titanium Retainer Kit (MPN 5013) provides the valvetrain stability required for performance driving and forced induction. The conical spring design offers superior natural damping compared to traditional cylindrical springs, effectively controlling harmonics while reducing reciprocating mass at the retainer end.

• Fits Ford 5.2L Voodoo (GT350) and Predator (GT500) engines.
• Conical spring profile reduces valve spring surge and harmonic vibration.
• Precision-machined Titanium (Ti) retainers for maximum weight savings and strength.
• Designed to handle increased lift and high-RPM operation.
• Complete set including springs and retainers.
• Manufacturer Part Number: 5013

Fits Ford Mustang Gen 3 Coyote (5.0L).

The GSC Power-Division P-D Conical Valve Spring and Titanium Retainer Kit is a critical valvetrain upgrade for the Gen 3 5.0L Coyote engine. Designed to handle the rigors of high-RPM operation and performance camshaft profiles, this kit replaces the factory springs with precision-engineered conical units and lightweight titanium retainers. The conical spring geometry provides superior harmonic damping and reduces reciprocating mass at the retainer end, which is essential for maintaining valve control and preventing float at higher engine speeds.

• Conical spring design for improved harmonic control and high-RPM stability
• High-strength, lightweight titanium retainers to reduce valvetrain inertia
• Engineered specifically for Gen 3 Coyote valvetrain geometry and seat pressures
• Ideal for forced induction or high-lift naturally aspirated builds
• Manufacturer Part Number: 5012

Fits Ford Mustang Gen 1/2 (5.0L Coyote).

Engineered for high-performance applications, the GSC Power-Division High Pressure Conical Valve Spring and Titanium Retainer Kit (MPN 5011) provides the seat pressure and stability required for Gen 1 and Gen 2 5.0L Coyote engines. The conical spring design reduces reciprocating mass at the retainer end, significantly improving harmonic damping and allowing for higher RPM limits without the risk of valve float.

This kit utilizes lightweight, aerospace-grade titanium retainers to further reduce valvetrain inertia, ensuring precise valve control and reliable performance under high boost or aggressive camshaft profiles.

• High-pressure conical valve springs for superior harmonic control and stability
• Precision-machined titanium retainers for significantly reduced valvetrain mass
• Specifically engineered for Gen 1 and Gen 2 Coyote 5.0L cylinder heads
• Essential for high-revving naturally aspirated or forced induction builds
• Manufacturer Part Number: 5011

Fits Ford Mustang Coyote Gen 1/2 engines (5.0L).

Upgrade your valvetrain stability with the GSC Power-Division Conical Valve Spring and Titanium Retainer Kit. Engineered for high-performance applications, this kit replaces the factory valve springs and retainers to provide better control during high-RPM operation. The conical spring design reduces reciprocating mass at the retainer end, minimizing harmonics and spring surge. This is paired with precision-machined titanium retainers, offering a superior strength-to-weight ratio over OE steel components to ensure reliable valve timing and seat pressure.

• Specifically designed for Gen 1 and Gen 2 Coyote 5.0L engines
• Conical spring profile for improved valvetrain harmonics
• CNC-machined titanium retainers for reduced mass and high-load durability
• Helps prevent valve float in performance driving conditions
• Manufacturer Part Number: 5010

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

GSC Power-Division CNC-machined spring seats are engineered for precision valvetrain setup on the Mitsubishi 4G63T platform. These seats are manufactured from high-strength chromoly and feature a .035-inch increased thickness over factory OEM units. This specific height allows for increased valve spring seat pressure or fine-tuning of the installed height without the need for cylinder head machining.

• Manufactured from high-strength Chromoly steel
• Precision CNC-machined for exact tolerances
• .035" over OEM thickness for spring pressure adjustment
• Complete set of 16 seats
• Direct fit for 4G63T cylinder heads
• Manufacturer Part Number: 4041-16