Fits 1992-2001 Acura Integra GS-R and Type R, 1999-2000 Honda Civic Si, and 1994-1997 Honda Civic del Sol VTEC. This kit provides the valvetrain stability and tension required for high-lift camshafts and high-RPM engine operation.

The Skunk2 Alpha Series Valve Spring and Titanium Retainer Kit (MPN 344-05-1300) features dual valve springs manufactured from Japanese-milled chrome-silicone wire. By using inner and outer springs with a slight interference fit and differing frequencies, these springs prevent valve float and maintain stability at engine speeds exceeding 10,000 RPM. The included Alpha Titanium Retainers are CNC-machined from ultrasonically inspected medical-grade titanium. Each retainer features radius-cut edges for rocker arm clearance and strategically positioned lightening grooves to reduce reciprocating mass without compromising strength.

• Seat Pressure: 68 lbs @ 1.320 in
• Open Pressure: 210 lbs @ 0.820 in
• Coil Bind: 0.800 in
• Material: Chrome-silicone wire springs and medical-grade titanium retainers
• Fitment: Honda/Acura B-Series VTEC engines
• Manufacturer Part Number: 344-05-1300

Upgrade your valvetrain with the Skunk2 Ultra Valve Springs and Spring Base Kit, specifically engineered for the Honda L15B7 1.5L Turbo engine. Designed to handle the rigors of high-boost and increased-RPM environments, this kit provides the seat pressure required to prevent valve float and ensure reliable engine performance during aggressive driving.

These springs are manufactured from high-tensile chrome silicon steel, offering exceptional fatigue resistance and durability. By replacing the factory components with Skunk2 Ultra series hardware, you gain the stability needed for higher lift camshafts or increased boost levels. The included spring bases are precision-machined to ensure perfect alignment and geometry within the cylinder head.

• Engineered specifically for Honda L15B7 1.5L Turbo engines
• Constructed from premium high-tensile chrome silicon wire
• Increased seat pressure to prevent valve float at high RPM
• Includes precision-machined spring bases for correct geometry
• Manufacturer Part Number: 313-05-9400

Fits select 1990-2010 Acura Integra, RSX, TSX, and Honda Civic/Civic del Sol (B/D/F/H/K VTEC Series).

Skunk2 Valve Keepers/Locks are precision-engineered to maintain valvetrain integrity in high-performance Honda and Acura VTEC engines. CNC-machined from high-quality bar stock for exact tolerances, these 7-degree locks ensure a perfect fit and finish between the valve stem and retainer. To handle the stresses of high-RPM operation, each keeper is heat-treated for maximum strength and finished with a black oxide coating for long-lasting corrosion resistance and a professional look.

• Manufacturer Part Number: 312-05-0150
• Quantity: Set of 32 (complete set for 16 valves)
• Valve Stem Size: 5.5mm
• Keeper Seat: 7 Degree
• Compatibility: Designed for use with most OEM and aftermarket 7-degree retainers
• Material: CNC-machined bar stock, heat-treated
• Finish: Black Oxide

Fits select Honda and Acura B, D, F, and K-series engines equipped with 5.5mm valve stems.

Skunk2 Viton Valve Stem Seals are engineered to provide precise oil control and maximum durability under the stresses of high-RPM operation. While standard OEM valve stem seals often utilize different materials for intake and exhaust sides, Skunk2 manufactures every seal in this kit from high-quality Viton. This specialized material is chosen for its exceptional resistance to extreme cylinder head temperatures, aggressive oil additives, and mechanical abrasion.

Each seal features stiffer-than-stock retaining springs to ensure a secure, precise fit on the valve guide. This design facilitates essential valve stem lubrication while effectively keeping oil out of the combustion chamber, preventing carbon buildup and maintaining engine performance. Whether you are performing a standard rebuild or a high-performance head build, these seals offer the reliability needed for high-lift camshafts and sustained high-RPM use.

• Designed for Honda/Acura engines using a 5.5mm valve stem
• Manufactured from high-grade Viton for superior heat and chemical resistance
• Stiffer retaining springs ensure a precise, secure fit
• Exceeds OEM specifications for durability and oil control
• Compatible with popular B, D, F, and K-series powerplants
• Manufacturer Part Number: 312-05-0100

Fits 1993-2001 Honda Prelude (VTEC, Base, and Type SH) equipped with H22A or F20B engines.

Skunk2 Valve Spring Bases are engineered to solve a specific valvetrain compatibility challenge for H-series enthusiasts. These precision-machined bases allow H-series VTEC cylinder heads to accept Skunk2 Pro Series Valve Springs and Titanium Retainers originally designed for B-series engines, providing access to a wider range of high-performance valvetrain components.

Each spring base is developed using 3D CAD and Finite Element Analysis (FEA) to ensure structural integrity under the high-stress conditions of a performance valvetrain. Manufactured from ultrasonically inspected, certified high-quality steel, these components undergo CNC machining and individual inspection for dimensional accuracy and surface finish. Tested on both the engine dyno and the road, these bases provide the reliability required for high-lift, high-RPM applications.

• Engineered for H22A and F20B VTEC cylinder heads
• Enables use of B-series Pro Series springs and retainers
• Manufactured from CNC-machined, certified steel
• 0.480 in. Inner Diameter
• Set of 16
• Manufacturer Part Number: 312-05-0015

Fits select 2002-2011 Honda and Acura models including RSX, Civic Si, TSX, Accord, CR-V, and Element (K-Series i-VTEC).

Skunk2 Pro Series XP (Extra Pressure) Racing Valve Spring Kits are engineered for the extreme demands of turbocharged and high-RPM Honda K-series engines. These dual valve springs utilize a slight interference fit between the inner and outer springs to damp harmonics and maintain valvetrain stability at engine speeds exceeding 11,000 RPM. The XP series provides 100 lbs of seat pressure to ensure reliable valve seating under high boost or with aggressive high-lift camshafts.

Each spring is manufactured from Japanese-milled, super-clean chrome-silicone wire. The rigorous manufacturing process includes eddy-current inspection, heat treatment, shot-peening, and chemical polishing to maximize fatigue resistance and minimize load loss over time. A specialized nitriding process provides a durable finish capable of withstanding championship-level racing conditions.

• Seat Pressure: 100 lbs @ 1.600 in.
• Open Pressure: 255 lbs @ 1.100 in.
• Maximum Lift: 0.680 in.
• Coil Bind: 0.890 in.
• Construction: Super-Clean Chrome-Silicone Wire
• Quantity: Set of 16 Dual Springs
• MPN: 311-05-7380

Fits select 1992-2001 Acura Integra (GS-R, Type R), Honda Civic Si, and Civic del Sol VTEC with B-Series engines.

The Skunk2 Pro Series XP (Extra Pressure) Racing Valve Spring Kit is engineered for high-performance Honda B-series VTEC engines, particularly those utilizing forced induction or extreme high-RPM operation. These dual valve springs are the culmination of nearly two decades of racing experience, designed specifically to prevent valve float and maintain valvetrain stability at engine speeds exceeding 11,000 RPM.

Each spring is manufactured from Japanese-milled, super-clean chrome-silicone wire. The inner and outer springs are mated via a slight interference fit with differing frequencies to effectively dampen harmonics. The manufacturing process includes eddy-current inspection, heat treatment, shot-peening, and chemical polishing, followed by a specialized nitriding process for maximum resistance to load loss and fatigue. These springs feature a higher seat pressure of 93 lbs at 1.320 inches, providing the necessary tension for high-lift camshafts while maintaining a safe coil bind height.

• Prevents valve float and maintains valvetrain stability beyond 11,000 RPM
• Manufactured from super-clean, Japanese-milled chrome-silicone wire
• Dual spring design with interference fit to reduce harmonic vibration
• Seat Pressure: 93 lbs @ 1.320 in.
• Open Pressure: 238 lbs @ 0.820 in.
• Coil Bind: 0.718 in.
• Set of 16 springs (inner and outer pairs)
• Manufacturer Part Number: 311-05-7350

Fits select 2002-2011 Acura RSX and TSX, and Honda Accord, Civic, CR-V, and Element (K20/K24/F20C/F22C).

Skunk2 Alpha Tuner Series Valve Springs are engineered to prevent valve float and maintain valvetrain stability at engine speeds exceeding 10,000 RPM. These dual springs feature an inner and outer spring mated through a slight interference fit with differing frequencies, a design derived from Skunk2’s extensive experience in professional drag racing and engine building.

Each spring is manufactured from super-clean, Japanese-milled chrome-silicone wire to ensure long-term reliability and resistance to fatigue. To guarantee performance, Skunk2 tests these components in-house on both the engine dyno and the road, ensuring they meet the tolerances required for high-performance DOHC VTEC applications.

• Manufacturer Part Number: 311-05-1380
• Configuration: Dual Valve Springs (Set of 16)
• Material: Japanese Super-Clean Chrome-Silicone Wire
• Open Pressure: 220 lbs at 1.100 in.
• Seat Pressure: 60 lbs at 1.600 in.
• Coil Bind: 1.000 in.
• Maximum Engine Speed: 10,000+ RPM

Fits 1993-2001 Honda Prelude (Base, Type SH, and VTEC) with H22A or F20B engines.

Skunk2 Alpha Series Dual Valve Springs are engineered to maintain valvetrain stability and prevent valve float at engine speeds exceeding 10,000 RPM. These springs are manufactured from high-tensile, super-clean chrome-silicone wire milled in Japan, specifically designed to handle the high-lift and high-revving demands of performance DOHC VTEC builds. By increasing seat and open pressure, these springs ensure the valves follow the camshaft profile accurately, protecting your engine during aggressive driving or competitive racing.

Each component in the Tuner Series line undergoes rigorous testing, including dyno evaluation and real-world testing in drag racing engines reaching up to 11,000 RPM. This set of 16 dual springs provides the reliability and quality required for high-performance H-series and F-series valvetrains.

• Manufacturer Part Number: 311-05-1360
• Spring Type: Dual Springs
• Seat Pressure: 50 lbs at 1.400 in
• Open Pressure: 205 lbs at 0.900 in
• Coil Bind: 0.880 in
• Material: Super-Clean Chrome-Silicone Wire
• Quantity: Set of 16

Fits 1990-2001 Acura Integra (B16A / B17A / B18C). Engineered for high-performance builds, the Skunk2 Alpha Series Dual Valve Spring Set provides the necessary tension to maintain valvetrain stability and prevent valve float at engine speeds exceeding 10,000 RPM.

These dual springs are manufactured from super-clean chrome-silicone wire, a material chosen for its resistance to fatigue and consistent performance under extreme racing conditions. By replacing factory springs with this set, you ensure precise valve control, which is essential when using high-lift camshafts or operating in high-RPM ranges where the OEM valvetrain often reaches its limit.

• Manufacturer Part Number: 311-05-1350
• Quantity: Set of 16 dual springs
• Seat Pressure: 68 lbs at 1.320 in.
• Open Pressure: 210 lbs at 0.820 in.
• Coil Bind: 0.800 in.
• RPM Rating: Supports 10,000+ RPM

Fits select 1986-2000 Acura Integra, Honda Civic, CRX, del Sol, and Wagovan models. Skunk2 Alpha Series Valve Springs are engineered to maintain valvetrain stability and prevent valve float at engine speeds exceeding 10,000 rpm. Developed through years of racing experience, these springs are essential for high-RPM D-series builds where factory components reach their mechanical limits.

Each spring is manufactured from super-clean, chrome-silicone wire milled in Japan. To ensure long-term reliability and performance, Skunk2 subjects their valvetrain components to rigorous testing on both the dynamometer and the track, including high-RPM drag racing and superbike engine environments. These springs provide the necessary tension to ensure the valves follow the cam profile accurately during high-lift and high-speed operation.

• Prevents valve float and maintains stability at 10,000+ RPM
• Manufactured from high-quality Japanese chrome-silicone wire
• Seat Pressure: 62 lbs
• Open Pressure: 158 lbs
• Set of 16 springs
• Manufacturer Part Number: 311-05-1345

Fits select 1990-2001 Acura Integra, Honda Civic Si, Civic del Sol VTEC, and Prelude models.

The Skunk2 Alpha Series Titanium Retainer Kit is engineered to significantly reduce valvetrain mass, providing the stability required for high-RPM operation and increased horsepower. Manufactured from medical-grade, ultrasonically inspected titanium, these retainers are developed using 3D CAD and Finite Element Analysis (FEA) to ensure an optimized balance of strength and weight reduction. Each retainer features radius-cut edges for improved rocker arm clearance and strategically positioned lightening grooves.

To ensure precise fitment and performance, Skunk2 utilizes CNC machining followed by individual inspections for hole diameter, taper, and surface defects. These tight tolerances ensure proper installed valve spring heights and consistent seat pressures. The reduced overall height also provides better valve seal clearance compared to standard retainers. For quality assurance and material traceability, every retainer is serialized with material batch and production date information.

• Manufacturer Part Number: 308-05-1300
• Material: Medical-grade, certified titanium
• Design: FEA-optimized with radius-cut edges and lightening grooves
• Process: CNC machined and ultrasonically inspected
• Traceability: Individually serialized components
• Function: Replaces heavy OE retainers to reduce valvetrain mass

Fits select 2002-2011 Honda and Acura models (K20/K24/F20C/F22C).

Skunk2 Pro Series Titanium Retainers (MPN: 308-05-0410) are engineered to reduce valvetrain mass, significantly improving stability at high engine speeds. By reducing reciprocating weight, these retainers allow for higher RPM ceilings and better horsepower potential. Unlike standard aftermarket offerings, these retainers feature radius-cut edges for increased rocker arm clearance and strategically placed lightening grooves for maximum weight savings.

The reduced overall height provides additional valve seal clearance, which is critical in high-lift applications. Manufactured from certified, ultrasonically inspected medical-grade titanium, each piece is CNC-machined and individually inspected for proper hole diameter and taper. For quality assurance, every retainer is serialized with material batch specifics and production dates.

• Significant Mass Reduction: 42% lighter than OEM steel retainers.
• Advanced Engineering: Designed using 3D CAD and FEA (Finite Element Analysis) for optimal strength-to-weight ratios.
• Superior Clearance: Radius-cut edges and reduced height for improved rocker arm and valve seal clearance.
• High-RPM Performance: Tested in extreme environments ranging from 11,000 RPM drag engines to 17,000 RPM applications.
• Spring Compatibility: Optimized for use with Skunk2 Tuner Series or Pro Series valve springs.
• Quantity: Set of 16 retainers.

The GSC Power-Division Cylindrical Valve Spring Kit (MPN 5775) is designed specifically for the Nissan RB26 and RB26DETT engines to enhance valvetrain stability and reliability. These cylindrical springs serve as a critical upgrade for engines requiring more consistent spring rates and improved harmonic resistance at higher RPM ranges compared to aged factory components.

• Fits Nissan RB26 and RB26DETT engines
• High-quality cylindrical spring geometry for consistent performance
• Designed for high-RPM valvetrain control and durability
• Direct fitment for RB26 cylinder heads
• Manufacturer Part Number: 5775

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

The GSC Power-Division valve spring seat and retainer kit (MPN 5756) is engineered to provide a stable, high-strength foundation for high-performance valvetrain setups. Designed specifically for use with single valve springs, this kit replaces factory components with precision-engineered materials to improve engine response and valvetrain stability at higher RPM ranges.

• Titanium Retainers: Precision-machined for significant weight reduction over factory steel, reducing reciprocating mass for improved valvetrain control.
• Chromoly Seats: High-strength chromoly steel seats provide a hardened, durable surface that resists wear and prevents spring walking under high loads.
• Platform Specific: Engineered for the FA20 engine, ensuring exact tolerances and a direct replacement for OE seats and retainers.
• Manufacturer Part Number: 5756

Fits select 1988-1995 Toyota Celica All Trac and MR2 Turbo (3SGTE) utilizing a shim-under-bucket conversion.

This GSC Power-Division valve spring and titanium retainer kit is engineered to meet the demands of high-performance 3SGTE builds. By replacing the heavy factory components, this kit significantly reduces reciprocating mass in the valvetrain, providing the stability and seat pressure required to prevent valve float at high RPM and increased boost levels. The lightweight titanium retainers are CNC-machined for precise fitment and durability, while the springs are designed specifically for the geometry of shim-under-bucket setups.

• Manufacturer Part Number: 5746
• Compatible with Toyota 3SGTE shim-under-bucket configurations
• High-strength chrome silicon valve springs
• Lightweight, CNC-machined titanium retainers
• Engineered for high-lift camshafts and elevated RPM ranges
• Direct fit for 1988-1995 Toyota Celica and MR2 Turbo applications

Fits 1993-1998 Toyota Supra Twin Turbo models (2JZGTE / 2JZGE / VVTI).

The GSC Power-Division valve spring kit is designed to provide the increased seat pressure and high-rev stability required for high-performance 2JZ builds. These springs are engineered to handle the added demands of aftermarket camshafts and high-boost applications, preventing valve float and ensuring consistent valvetrain timing. This kit is compatible with GTE, GE, and VVT-i cylinder head variants.

• Specifically engineered for Toyota 2JZ platforms
• Compatible with 2JZGTE, 2JZGE, and VVT-i engine variants
• Provides improved tension and seat pressure for high-RPM operation
• Prevents valve float under high boost or aggressive cam profiles
• Manufacturer Part Number: 5744
• Includes: Set of 24 valve springs

Fits select 1999-2015 Subaru Impreza, WRX, and WRX STI models, as well as the 2005 Saab 9-2X Aero (EJ Turbo DOHC engines).

The GSC Power-Division (P-D) Valve Spring and Titanium Retainer Kit (MPN 5743) is engineered to provide the valvetrain stability required for high-performance EJ-series DOHC engines. This kit is a critical upgrade for builds utilizing aggressive camshaft profiles, high boost levels, or increased RPM limits where factory springs are prone to valve float. By combining high-tensile valve springs with precision-machined titanium retainers, this kit reduces reciprocating mass and increases seat pressure to ensure reliable valve control and improved throttle response.

• Manufacturer Part Number: 5743
• Material: High-tensile springs with lightweight titanium retainers
• Application: Specifically designed for Subaru EJ Turbo DOHC valvetrains
• Benefits: Prevents valve float and supports higher lift camshafts
• Kit Components: Full set of performance valve springs and titanium retainers

The GSC P-D Dual Valve Spring and Titanium Retainer Kit is engineered for high-performance Toyota 2JZ engines. This kit (MPN 5266) provides the seat pressure and coil bind clearance required to support aggressive camshaft profiles and high-boost applications where factory valve train components may reach their limits.

By utilizing a dual-spring design, this set improves harmonic dampening and ensures stable valve operation at high RPMs. The included titanium retainers significantly reduce reciprocating mass compared to standard steel units, allowing for faster engine response and increased protection against valve float during spirited driving or competitive use.

• Fits Toyota 2JZ engines
• Includes precision-wound dual valve springs
• Lightweight CNC-machined titanium retainers
• Designed for high-lift camshafts and increased boost pressure
• Manufacturer Part Number: 5266

Strengthen your valvetrain for high-performance applications with the GSC Power-Division Conical Valve Spring and Titanium Retainer Kit. Engineered specifically for the Ford 3.5L H.O. EcoBoost engine found in the Raptor, Platinum, and Limited trims, this kit provides the high-RPM stability and seat pressure required to prevent valve float in forced induction environments.

The conical spring geometry offers significant advantages over traditional cylindrical springs by reducing reciprocating mass and improving harmonic damping. By pairing these springs with precision-machined titanium retainers, valvetrain inertia is minimized, allowing for more aggressive cam profiles and increased boost levels without compromising valve control.

• Fits Ford F-150 Raptor, Platinum, and Limited models with 3.5L H.O. EcoBoost engines
• Advanced conical spring design for superior vibration control and reduced mass
• Lightweight titanium retainers for improved throttle response and RPM capability
• Engineered to withstand the thermal and mechanical stresses of turbocharged H.O. engines
• Manufacturer Part Number: 5102

Upgrade your valvetrain for high-performance applications with the GSC Power-Division High Pressure Conical Valve Spring and Titanium Retainer Kit. Engineered specifically for the Mitsubishi 4G63T engine, this kit (MPN: 5098) provides the increased seat pressure and stability required for high-boost and high-RPM builds where factory components are prone to failure.

The conical spring geometry reduces reciprocating mass and improves harmonic damping compared to traditional cylindrical springs. Paired with lightweight, CNC-machined titanium retainers, this set ensures precise valve control and significantly reduces the risk of valve float during aggressive lift cycles or high-speed operation.

• Engine Compatibility: Mitsubishi 4G63T
• Spring Style: High-pressure conical design for reduced mass and vibration
• Retainer Material: Lightweight, high-strength CNC-machined titanium
• Ideal for high-boost and high-RPM performance builds
• Manufacturer Part Number: 5098

Designed for high-output Mitsubishi 4G63T engines, the GSC Power-Division Extreme Pressure Conical Valve Spring and Titanium Retainer Kit (MPN 5097) provides the valvetrain stability necessary for high-lift camshafts and elevated RPM ranges. The conical spring architecture reduces the moving mass at the top of the spring, effectively minimizing valvetrain harmonics and increasing the RPM ceiling before valve float occurs.

This kit includes precision-engineered titanium retainers that offer a significant weight reduction compared to steel alternatives without compromising structural integrity. These components work in tandem to ensure precise valve control under the extreme cylinder pressures common in turbocharged applications.

• Fits Mitsubishi 4G63T engines
• Advanced conical spring design for reduced oscillating mass
• Includes high-strength lightweight titanium retainers
• Engineered for extreme pressure and high-lift cam profiles
• Manufacturer Part Number: 5097

Fits 2017-present Audi RS3 models equipped with the 2.5L TFSI DAZA engine.

Engineered for high-output 2.5L TFSI builds, the GSC Power-Division Beehive Valve Spring and Titanium Retainer Kit (MPN 5096) provides the necessary valvetrain stability for extreme forced induction applications. The beehive spring design offers a progressive spring rate and reduced reciprocating mass compared to traditional cylindrical springs, effectively eliminating valve float and bounce in high-RPM scenarios.

This kit is specifically validated for builds running up to 60 PSI of boost. The included retainers are CNC-machined from aerospace-grade titanium to minimize weight on the valve stem, allowing for quicker response and increased reliability under heavy thermal and mechanical stress.

• Compatible with Audi RS3 DAZA engines (2017+)
• Rated for maximum boost levels up to 60 PSI
• Beehive spring architecture for superior harmonics control
• Lightweight titanium retainers reduce valvetrain mass
• Manufacturer Part Number: 5096

Fits BMW Z4 and Toyota Supra models equipped with the B58 engine.

The GSC Power-Division (P-D) Beehive Valve Spring and Titanium Retainer Kit is engineered to handle the increased valvetrain stress associated with high-performance B58 builds. By utilizing a beehive-shaped spring design, this kit offers superior harmonic resistance and reduced reciprocating mass compared to standard cylindrical springs. This is a critical upgrade for preventing valve float at high RPMs and under the elevated boost pressures common in tuned applications.

The included CNC-machined titanium retainers significantly lighten the valvetrain assembly, improving engine response and overall reliability during aggressive driving or track use.

• Engineered specifically for the B58 engine platform
• High-tensile beehive valve springs for improved harmonic damping
• Lightweight CNC-machined titanium retainers to reduce valvetrain mass
• Prevents valve float in high-boost and high-RPM applications
• Manufacturer Part Number: 5091

Engineered for high-performance Toyota 2JZ-GTE applications, the GSC Power-Division (MPN 5086) Extreme Pressure Single Conical Valve Spring and Titanium Retainer Kit provides the valvetrain stability required for high-boost and high-RPM builds. The single conical spring profile reduces reciprocating mass and offers superior harmonic damping compared to conventional straight-wall springs.

• Fits Toyota 2JZ-GTE engines.
• Single conical spring design for reduced top-end weight and improved valvetrain harmonics.
• Extreme pressure rating specifically developed for high-lift camshafts and high-boost environments.
• Precision-machined Titanium (Ti) retainers for maximum strength and weight reduction.
• Comprehensive kit includes springs and retainers for a complete valvetrain upgrade.
• Manufacturer Part Number: 5086

Fits Nissan RB26DETT engines.

This GSC Power-Division valvetrain kit is engineered specifically for high-output RB26 builds requiring maximum stability under extreme manifold pressure. By utilizing a conical spring design, this kit reduces reciprocating mass at the retainer end and provides superior harmonic dampening compared to traditional cylindrical springs. This setup is critical for preventing valve float in high-revving engines pushed up to 50 PSI of boost.

The shimless configuration simplifies your cylinder head assembly while the lightweight titanium retainers offer the strength needed for aggressive camshaft profiles. Whether you are building a dedicated drag car or a high-response street machine, these components ensure your valvetrain remains precise and controlled at the limit.

• Fits Nissan RB26DETT engines
• Includes conical valve springs and titanium retainers
• Shimless design for reduced valvetrain complexity
• Maximum boost rating: 50 PSI
• Manufacturer Part Number: 5085

Specifically engineered for high-output Nissan VR30DDTT engines, the GSC Power-Division HP Conical Valve Spring, Ti Retainer, and Seat Kit provides the valvetrain stability required for aggressive builds. This comprehensive upgrade is designed to handle the extreme cylinder pressures and high engine speeds found in professional motorsport applications, supporting up to 10,500 RPM and 55 PSI of boost.

The conical spring architecture utilizes a smaller, lighter retainer which significantly reduces reciprocating mass. This design allows for superior valve control and improved harmonic damping compared to traditional cylindrical springs. Each kit includes precision-machined titanium retainers and hardened steel seats to ensure long-term durability under high-lift and high-boost conditions, protecting your engine from valve float and catastrophic failure.

• Direct fit for Nissan VR30DDTT (3.0L Twin-Turbo V6) engines
• Conical spring profile for reduced top-end mass and improved harmonics
• Lightweight aerospace-grade Titanium retainers
• Precision-hardened steel spring seats included
• Max Rating: 10,500 RPM / 55 PSI Boost
• Manufacturer Part Number: 5084

Fits Nissan VR30DDTT (3.0L Twin Turbo V6) engines.

Engineered for high-output builds, the GSC Power-Division HP Conical Valve Spring, Titanium Retainer, and Seat Kit (MPN 5083) provides the valvetrain stability required for extreme performance. The conical spring design reduces reciprocating mass at the retainer end, allowing for superior harmonic control and preventing valve float during high-RPM operation.

This valvetrain upgrade is specifically designed to handle the pressures of high-boost applications, rated for up to 9,500 RPM and 40 PSI of boost. The kit includes lightweight titanium retainers to minimize valvetrain inertia and hardened seats to prevent spring galling on the cylinder head surface.

• Engine Compatibility: Nissan VR30DDTT
• Maximum Engine Speed: 9,500 RPM
• Maximum Boost Pressure: 40 PSI
• Spring Design: Conical for improved harmonic damping
• Retainer Material: Lightweight Titanium
• Includes: Valve springs, titanium retainers, and hardened seats
• Manufacturer Part Number: 5083

The GSC Power-Division 5076 valve spring kit is engineered to provide the valvetrain stability required for high-performance Subaru EJ series engines. This kit utilizes a conical spring design, which features a smaller diameter at the top of the spring to reduce reciprocating mass and improve harmonic damping compared to traditional cylindrical designs.

By pairing these conical springs with lightweight, aerospace-grade titanium retainers, this kit significantly reduces the weight at the valve. This reduction in mass allows for higher engine speeds and provides essential protection against valve float in high-boost or high-RPM applications where standard components may fail.

• Fits Subaru EJ series engines
• Conical spring profile for superior harmonic control and reduced mass
• Precision-machined titanium retainers for maximum weight savings
• Designed to support aggressive camshaft profiles
• Manufacturer Part Number: 5076

Fits Nissan RB26DETT (RB26) engines.

The GSC Power-Division Conical Valve Spring Kit (5075) is engineered to provide superior valvetrain stability for high-performance RB26 builds. By utilizing a conical profile, these springs reduce the reciprocating mass at the retainer end, which effectively shifts the harmonic resonance point higher in the RPM range. This design allows for increased engine speeds and improved valve control, especially when running aggressive camshaft profiles or high boost levels where standard springs may suffer from valve float.

• Conical spring design reduces valvetrain harmonics and mass
• Enhanced high-RPM stability and durability
• Direct fit for Nissan RB26DETT cylinder heads
• Manufacturer Part Number: 5075