Engineered for high-performance Honda and Acura K20A VTEC engines, this Skunk2 Racing Multiple Layer Steel (MLS) Head Gasket provides a superior seal under extreme cylinder pressures. This stopper-type gasket is specifically designed to handle the increased vibrations and thermal loads found in modified builds, making it an ideal choice for blocks that have been bored for additional cylinder size where surface area around the combustion chamber is limited.

Constructed from high-grade stainless steel layers, the gasket features a precision HR-180 Fluoroelastomer synthetic rubber coating for maximum flange conformability. Each unit is laser-welded and plastic resin coated to ensure structural integrity and long-term resistance to corrosion and vibration.

• Max Bore Diameter: 88.00mm (3.464in)
• Thickness: 1.1mm (0.043in)
• Material: Multiple Layer Steel (MLS)
• Coating: HR-180 Fluoroelastomer Synthetic Rubber
• Heat Resistance: Rated to 250°C (482°F)
• Construction: Laser-welded stopper type
• Manufacturer Part Number: 366-05-4200

Engineered for high-performance Honda and Acura K20A VTEC engines, the Skunk2 Multi-Layer Steel (MLS) Head Gasket (366-05-4000) provides the critical sealing required for high-compression or forced induction builds. This stopper-type gasket uses strategically placed material to enhance sealing against the extreme cylinder pressures and vibrations typical of modified engines. It is specifically designed for applications where cylinder boring has reduced the available surface area around the combustion chamber.

Constructed from precision laser-welded steel layers, this gasket features an HR-180 fluoroelastomer synthetic rubber coating for maximum flange conformability. This specialized coating ensures a leak-free seal even under severe thermal loads, with heat resistance rated up to 250°C (482°F). The multi-layer design offers increased resistance to corrosion and vibration compared to traditional composite gaskets.

• MPN: 366-05-4000
• Bore Size: 87.00mm (3.425 in)
• Thickness: 1.35mm (0.053 in)
• Material: Multi-Layer Steel (MLS)
• Coating: HR-180 Fluoroelastomer Synthetic Rubber and Plastic Resin
• Construction: Laser Welded Stopper Type
• Heat Resistance: Up to 250°C (482°F)

Fits Honda/Acura K20A VTEC engines.

The Skunk2 HG Series Multi-Layer Steel (MLS) head gasket is engineered for high-performance applications where combustion pressures and temperatures exceed factory limits. This "stopper" type gasket features extra material strategically sandwiched between the steel layers to provide a superior mechanical seal around the combustion chamber. This design is specifically ideal for engines with minimal surface area around the cylinder walls due to oversized boring.

Constructed with laser-welded stainless steel layers and coated with HR-180 fluoroelastomer synthetic rubber, this gasket ensures excellent flange conformability and provides increased resistance to the vibrations and corrosion found in modified engines.

• Bore Diameter: 87.00mm (3.425 in)
• Thickness: 0.85mm (0.033 in)
• Material: Multi-Layer Steel (MLS)
• Coating: HR-180 Fluoroelastomer Synthetic Rubber & Plastic Resin
• Heat Resistance: Up to 250°C (482°F)
• Construction: Laser Welded Stopper Type
• Manufacturer Part Number: 366-05-3700

This Skunk2 Multi-Layer Steel (MLS) Head Gasket is engineered for high-performance Honda H22A VTEC engines, specifically those with oversized bores up to 88.00mm. Designed to withstand the intense cylinder pressures of high-compression and forced induction builds, this stopper-type gasket features additional material strategically sandwiched between layers to ensure a positive combustion seal where standard gaskets often fail.

Constructed from multiple layers of stainless steel and laser-welded for precision, each gasket is coated with HR-180 Fluoroelastomer synthetic rubber. This coating provides excellent flange conformability and a superior seal against oil and coolant passages, even under the extreme thermal cycles of racing applications.

• Vehicle Fitment: Fits Honda H22A VTEC engines.
• Bore Diameter: 88.00mm (3.464in) Max Bore.
• Gasket Thickness: 0.85mm (0.033in).
• Material: Multiple Layer Steel (MLS) with plastic resin coating.
• Advanced Sealing: HR-180 Fluoroelastomer coating, heat-resistant to 250°C (482°F).
• Construction: Laser-welded stopper-type design for high-power applications.
• Manufacturer Part Number: 366-05-3400

Fits select 1988-2001 Honda Civic, CRX, Prelude, and Acura Integra (1.5L / 1.6L / 1.8L / 2.2L / 2.3L).

Skunk2 High-Pressure Radiator Caps are engineered to optimize cooling system efficiency by increasing internal system pressure. This Type A cap features an open valve pressure of 1.3 kg/cm², which is approximately 0.2 kg/cm² higher than most factory OEM radiator caps. By increasing this pressure, the coolant boiling point is raised, providing a critical safety margin and more efficient heat dissipation under the high-load conditions of competitive racing or spirited street driving.

Designed as a functional engine bay upgrade, this cap is fully compatible with Skunk2 silicone radiator hoses and most high-performance aftermarket radiators. It replaces worn factory caps to ensure your cooling system maintains the pressure required for peak engine performance.

• Pressure Rating: 1.3 kg/cm² (18.5 psi)
• Manufacturer Part Number: 359-99-0020
• Elevates coolant boiling point for improved thermal management
• Fits most Mazda, Mitsubishi, Nissan, and Subaru applications
• Compatible with 1988-1991 Civic/CRX, 1990-1993 Integra, and 1992-2001 Prelude

Fits select 1990-2010 Honda and Acura models including Accord, Civic, Integra, RSX, TSX, Element, Fit, and S2000.

Skunk2 High-Pressure Radiator Caps are designed to improve cooling efficiency by increasing internal system pressure. By maintaining a higher pressure, the boiling point of your engine coolant is raised, providing a greater margin of safety against overheating and cavitation during high-load conditions on both the street and the track. Each cap is rated at 1.3 kg/cm², which is 0.2 kg/cm² higher than most factory equipment.

As part of Skunk2's Fine Tuning line, these Type B caps are a perfect finishing touch for a built engine bay and are specifically designed for use with Skunk2 silicone radiator hoses and factory-style radiator necks. This precision-engineered component replaces the standard OE cap to ensure your cooling system operates at its peak potential.

• Open Valve Pressure: 1.3 kg/cm² (18.5 psi)
• Fitment Type: Type B
• Manufacturer Part Number: 359-99-0010
• Increases coolant boiling point for improved heat dissipation
• Compatible with Skunk2 silicone radiator hoses

Fits 2006-2015 Honda Civic Si and S2000 models equipped with K24Z or F22C series engines.

The Skunk2 4-Bar MAP (Manifold Absolute Pressure) sensor is a vital upgrade for high-performance forced induction builds. Designed as a direct, plug-in replacement for the factory Honda sensor, this unit allows your ECU to accurately track manifold pressure well beyond the limits of the original equipment. It provides a clean, linear signal for precise tuning on turbocharged or supercharged applications.

Engineered for reliability in high-heat environments, this sensor eliminates the need for splicing or hack-and-tap installations. Simply swap the OE unit for the Skunk2 352-05-1520 to gain the resolution needed for high-boost management while maintaining a factory-style fit and finish.

• Manufacturer Part Number: 352-05-1520
• Pressure Rating: 4 Bar
• Maximum Boost Support: 43.5 psi
• Installation: Direct plug-in compatible with factory harness
• Engine Compatibility: Honda K24Z and F22C series

Fits select 2002-2017 Acura and Honda models equipped with K-Series engines, including Civic Si, RSX, Accord, CR-V, and Element.

The Skunk2 3-Bar MAP (Manifold Absolute Pressure) sensor is a critical upgrade for forced induction K-Series builds. Designed as a direct plug-and-play replacement for the factory Honda sensor, this unit installs into the factory mounting position without wiring modifications. It provides the expanded pressure range necessary for the ECU to accurately scale fuel and ignition timing at higher manifold pressures.

• Pressure Range: 3-Bar
• Boost Capacity: Handles forced induction up to 29.0 psi
• Installation: Direct OEM replacement, plug-in compatible
• Compatibility: Honda K-Series engines
• Manufacturer Part Number: 352-05-1515

Fits select 1992-2001 Honda Civic, Civic del Sol, and Acura Integra.

The Skunk2 Dual Fuel Pump Hanger (MPN 351-05-0100) provides a high-performance fueling solution for high-horsepower builds, eliminating the need to sump the factory fuel tank. This component allows for the installation of dual fuel pumps to ensure consistent delivery and prevent fuel starvation during high-load conditions. Precision-engineered from CNC-machined 6061 billet aluminum and finished with a durable anodizing, this hanger is designed to withstand the rigors of high-performance fuel systems while maintaining a perfect fit in the factory tank location.

• CNC-machined 6061 billet aluminum construction
• Anodized finish for superior corrosion resistance
• Supports up to 600HP while utilizing the stock fuel system
• Eliminates the requirement for fuel tank sumping in high-HP applications
• Provides mounting and plumbing for two fuel pumps
• Includes necessary installation hardware and instructions
• Pre-wired for simplified setup (wiring harness upgrade required for dual pump operation)
• Manufacturer Part Number: 351-05-0100

Fits 2003-2006 Mitsubishi Lancer Evolution (Evolution, MR, RS, and SE) models equipped with the 4G63 engine.

The Skunk2 Composite High Volume Fuel Rail provides superior thermal insulation and flow compared to traditional aluminum rails. Constructed from a proprietary carbon-impregnated, aerospace thermo-polymer composite, this rail is 33% lighter and 60% stronger than aluminum counterparts. By insulating the fuel from both radiant and conductive heat transfer in the engine bay, it maintains fuel temperatures up to 100°F cooler, promoting denser fuel delivery for increased horsepower and torque.

Designed for high-output builds, the rail features a large 0.625-inch internal bore to dampen fuel injector pulsations and smooth interior finishes with radius-cut outlets for optimized flow. The composite construction allows for specialized internal geometry that eliminates sharp angles common in drilled-aluminum designs. This rail is compatible with all fuel types, including alcohol-based fuels, and is rated to support up to 1,200 HP.

• Integrated -8 AN inlet and outlet for custom fuel line plumbing
• Additional 1/8-inch NPT fuel pressure ports for sensors or gauges
• Compatible with factory fuel systems and all fuel types
• Supports up to 1,200 HP
• 0.625-inch internal bore for superior dampening and flow
• Manufacturer Part Number: 350-06-5100

Fits select 2002-2017 Acura and Honda models (ILX, RDX, RSX, TLX, TSX, Accord, Civic, CR-V, Crosstour, and Element).

The Skunk2 Racing K-Series Ultra Fuel Rail is a high-performance solution designed to meet the fueling demands of both naturally aspirated and forced induction K-Series builds. Re-engineered to streamline the product line, this single rail (350-05-7000) now replaces the previous K-Ultra Race Primary/Secondary, K-Ultra Street, and S2000 Ultra Race specific rails. It serves as the ideal companion for the Ultra Street Manifold and is especially effective on the Ultra Race Intake Manifold, where it can be utilized in either the primary or secondary injector positions.

• Versatile Application: Modular design allows one rail to function in both primary and secondary positions.
• Optimized Compatibility: Engineered specifically for use with Skunk2 Ultra Series Intake Manifolds.
• Direct Replacement: Supersedes manufacturer part numbers 350-05-6050, 350-05-6055, 350-05-6060, and 350-05-6070.
• Manufacturer Part Number: 350-05-7000

Fits select 1992-2001 Acura Integra and 1994-2000 Honda Civic Si and del Sol VTEC. Designed specifically for use with Skunk2 Ultra-Series Race intake manifolds, this secondary fuel rail provides the additional fueling required for high-horsepower B-Series applications.

Engineered from 6061-T6 aluminum, this fuel rail features a massive 0.669-inch internal bore to minimize pressure drops and pulses, supporting builds up to 1,200hp. The rail is finished in black anodizing for corrosion resistance and is fully compatible with E85 and methanol fuels. It features -8 AN O-ring (ORB) inlet and outlet ports for secure, leak-free plumbing in high-pressure environments.

• Fits Skunk2 Ultra-Series Race intake manifolds
• Material: CNC-machined 6061-T6 aluminum
• Bore Diameter: 0.669 in.
• Port Size: -8 AN ORB
• Supports up to 1,200 HP
• Compatible with E85 and Methanol fuels
• Manufacturer Part Number: 350-05-6010

Fits select 1992-2001 Acura Integra, Honda Civic Si, and Honda Civic del Sol models.

Skunk2 Racing engineers developed these high-volume primary fuel rails specifically for use with the Ultra-Series Race intake manifold. Each rail is CNC-machined from 6061-T6 aluminum to handle extreme fuel pressures and provide the flow necessary for high-horsepower builds. With a massive 0.669-inch internal bore and -8 AN O-ring thread ports, these rails are designed to eliminate fuel pressure drops and ensure consistent delivery even in demanding 1,000+ HP applications.

• Manufactured from 6061-T6 aluminum with a black finish
• 0.669-inch internal bore for maximum fuel flow
• -8 AN O-ring thread (ORB) ports
• Supports up to 1,200 HP
• Fully compatible with E85 and Methanol fuels
• Designed for primary injector placement on Skunk2 Ultra Race manifolds
• Manufacturer Part Number: 350-05-6000

Fits select 2002-2011 Acura RSX, TSX, and Honda Civic Si and Element models. The Skunk2 Composite High Volume Fuel Rail is engineered for K-series engines to outperform traditional aluminum alternatives in thermal management and durability. Manufactured from a proprietary carbon-impregnated, aerospace thermo-polymer composite, this rail is 33% lighter and 60% stronger than aluminum while operating up to 100°F cooler. By insulating fuel from radiant and conductive engine bay heat, it maintains lower fuel temperatures for improved combustion efficiency.

• Supports fuel requirements up to 1,200 hp
• Large 0.625-inch internal bore for superior fuel injector pulsation dampening
• Proprietary composite material reduces heat transfer by up to 100°F compared to aluminum
• Radius-cut fuel injector outlets and smooth interior finish for optimized flow
• Integrated 1/8-inch NPT fuel pressure ports for gauges or nitrous feed
• Compatible with factory fuel systems and all fuel types, including alcohol/E85
• Manufacturer Part Number: 350-05-5010

The unique internal geometry, which eliminates the sharp angles found in drilled-aluminum rails, is only possible through Skunk2's specialized composite molding process. This design ensures consistent fuel delivery and pressure across all injectors even in high-demand racing applications.

Fits select 1990-2001 Acura Integra, 1999-2000 Honda Civic Si, and 1994-1997 Honda Civic del Sol VTEC (B-Series engines).

The Skunk2 Composite High Volume Fuel Rail is engineered for high-performance B-series builds, utilizing a proprietary carbon-impregnated, aerospace thermo-polymer composite. This advanced material is 33% lighter and 60% stronger than traditional aluminum rails. More importantly, it acts as a thermal barrier, operating up to 100°F cooler than aluminum to insulate fuel from radiant and conductive engine bay heat, resulting in a denser fuel charge and increased power.

Designed to eliminate the sharp internal angles found in extruded aluminum rails, this composite rail features a massive 0.625-inch internal bore for superior fuel injector pulsation dampening. The smooth interior finish and radius-cut injector outlets optimize flow characteristics. Whether you are running a stock fuel system or a high-horsepower build using alcohol-based fuels, this rail is capable of supporting up to 1,200 HP.

• Manufacturer Part Number: 350-05-5000
• Integrated -8 AN inlet/outlet for custom fuel line plumbing
• Large 0.625-in internal bore for high-volume delivery
• Dual 1/8-in NPT fuel pressure ports for gauges or nitrous feeds
• Includes provisions for OEM fuel pressure regulator
• Compatible with all fuel types including alcohol/E85
• Tested to support up to 1,200 HP

Fits 2013-2020 Subaru BRZ, Scion FR-S, and Toyota 86 models. This direct-fit upgrade is engineered to provide superior cooling efficiency for high-performance street and track applications.

The Skunk2 Alpha Series Radiator is constructed from lightweight, high-grade aluminum with 100-percent brazed cores and polished end tanks. Its dual-core design and high-efficiency fins maximize heat transfer and thermal capacity, helping your engine manage heat cycles more effectively. Designed for a seamless installation, it retains compatibility with the factory cooling fan, shrouds, and 1.5-inch OEM radiator hoses without requiring vehicle modifications.

• Dual-core high-efficiency design for maximum cooling capacity
• 100% brazed aluminum construction for durability and weight savings
• 1.50-inch inlet and outlet to match OEM specifications
• Direct-fit installation; no modifications required for factory chassis
• Polished end tanks featuring the embossed Skunk2 Alpha logo
• Compatible with OEM cooling fans and shrouds
• Manufacturer Part Number: 349-12-1000

Note: This unit does not include a radiator cap. While designed for direct-fitment on the listed vehicles, some engine swap configurations may require custom radiator hoses or specialized cooling fans.

The Skunk2 Ultra Series BMF TLRC Rocker Set is engineered for high-performance B-Series engines that demand superior valvetrain stability at extreme RPMs. As part of the flagship Ultra Series, these rockers are designed to withstand the rigors of professional racing and aggressive camshaft profiles where standard components often reach their mechanical limits.

These rockers provide the necessary strength and precision for high-lift setups, ensuring consistent valve timing and reducing the risk of valvetrain-related failures during high-stress competition. They are a direct-fit solution for builders looking to optimize the cylinder head of their B-Series platform for maximum reliability under load.

• Manufacturer Part Number: 348-05-0200
• Series: Ultra Series BMF TLRC
• Engine Application: B-Series Engines
• Designed for high-RPM stability and high-lift camshaft compatibility
• Precision-engineered for racing durability

Fits 2022-2025 Honda Civic (1.5T).

Maximize the cooling efficiency of your L15B engine with the Skunk2 Intercooler. Specifically engineered for the 11th-generation Honda Civic, this performance core is designed to combat heat soak and lower intake air temperatures (IATs), ensuring consistent power delivery during high-load driving or track sessions.

This package includes the high-efficiency intercooler core and specialized piping adapters, allowing for a precise fitment and integration with existing plumbing. By replacing the restrictive factory unit, this Skunk2 upgrade optimizes airflow and heat dissipation while maintaining minimal pressure drop across the core.

• Manufacturer Part Number: 345-05-0300
• Includes necessary piping adapters for installation
• High-efficiency core design optimizes heat transfer
• Direct-fit replacement for the OEM intercooler
• Specifically designed for the L15B 1.5T engine platform

Fits 2016-2021 Honda Civic models equipped with the 1.5T engine. This Skunk2 intercooler core is designed as a direct-fit performance upgrade that maintains compatibility with the factory charge piping.

As boost levels increase, the factory intercooler often becomes a bottleneck, leading to heat soak and power loss. This Skunk2 unit replaces the restrictive OEM core with a high-efficiency design to improve thermal management and recovery times. It is an ideal solution for enthusiasts seeking better cooling performance without the complexity of a full aftermarket piping kit.

• Direct bolt-on replacement for the factory intercooler core
• Engineered to fit with original equipment (OEM) piping
• Increased surface area and internal volume for superior heat dissipation
• Durable construction to withstand high-boost applications
• Manufacturer Part Number: 345-05-0200

Fits 2016-2021 Honda Civic EX, EX-L, EX-T, LX, Si, Sport, Sport Touring, and Touring models (1.5T).

The Skunk2 Intercooler Kit is a high-performance bolt-on upgrade designed specifically for the tenth-generation Honda Civic 1.5T. This kit replaces the restrictive factory unit with an efficient aluminum core engineered to manage heat soak and reduce intake air temperatures, ensuring consistent performance for turbocharged engines. Constructed from 6061 aluminum for superior thermal conductivity, the core is finished in a durable black hard-anodized coating to resist corrosion and maintain a sleek appearance.

Designed as a direct bolt-on solution, this intercooler kit utilizes factory mounting points for a clean installation. The precision-engineered design requires no cutting, welding, or drilling, making it an ideal choice for enthusiasts looking to improve the cooling efficiency and reliability of their forced-induction Civic.

• Manufacturer Part Number: 345-05-0100
• Material: 6061 Aluminum
• Finish: Black Hard Anodized
• Installation: Direct bolt-on; no cutting, welding, or drilling required
• Engine Compatibility: 1.5T Turbocharged
• Included: Mounting hardware

Fits 1993-2001 Honda Prelude Base, Type SH, and VTEC models equipped with H-Series engines.

The Skunk2 Alpha Series Valve Spring and Titanium Retainer Kit is engineered to provide the valvetrain stability required for high-performance H-Series builds. These dual valve springs are designed to prevent valve float and bounce, ensuring consistent seat pressure and reliable performance at high RPMs. By pairing these springs with lightweight, precision-machined titanium retainers, this kit significantly reduces reciprocating mass, allowing for faster engine response and increased protection under aggressive cam profiles.

• Manufacturer Part Number: 344-05-1360
• Includes high-quality dual valve springs and titanium retainers
• Seat Pressure: 50 lbs @ 1.400 in.
• Open Pressure: 205 lbs @ 0.900 in.
• Coil Bind: 0.880 in.
• Designed specifically for Honda H-Series cylinder heads

Fits 1992-2000 Honda Civic and Civic del Sol (D-Series VTEC engines).

The Skunk2 Alpha Series Valve Spring and Titanium Retainer Kit is engineered to provide the valvetrain stability required for high-performance D-series builds. Designed to prevent valve float at engine speeds exceeding 10,000 RPM, this kit is essential for engines with aggressive cam profiles or increased rev limits. The Alpha Valve Springs are manufactured from high-tensile, Japanese-milled chrome-silicone wire, while the Alpha Titanium Retainers are CNC-machined from ultrasonically inspected medical-grade titanium to significantly reduce reciprocating mass.

Each retainer features radius-cut edges for increased rocker arm clearance and strategically positioned lightening grooves to minimize weight without compromising structural integrity. Utilizing FEA (Finite Element Analysis) and 3D CAD modeling, Skunk2 ensures optimal strength-to-weight ratios and precise installed heights for every component in this kit.

• Manufacturer Part Number: 344-05-1350
• Seat Pressure: 62 lbs
• Open Pressure: 168 lbs
• RPM Rating: 10,000+ RPM
• Spring Material: Super-clean chrome-silicone wire
• Retainer Material: CNC-machined medical-grade titanium
• Features: Radius-cut edges for rocker clearance and reduced overall height for valve seal clearance

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