Manley Performance Valve spring and Retainer Kits take the guess work out of making your valvetrain race-ready. Engineered for maximum durability, stability, and precision in high-performance and racing applications, these chrome-silicon alloy springs provide exceptional fatigue resistance and high-tensile strength, ensuring consistent valve control at extreme RPMs. Save time and money with these kits, featuring premium springs, retainers, designed to handle aggressive aftermarket camshafts.

• Includes matched Valve Springs, Retainers, and Locks (if part number ends in "K"). Spring Locators included in some applications.
• Includes 7 Machined Valve Locks manufactured from the premium quality heat treated steel
• Heat treated aerospace grade titanium retainers CNC machined to exacting tolerances
• Designed to handle aftermarket camshafts and up to 10,000 RPM

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Engineered for today’s high-revving sport compact engines, Manley valve springs deliver exceptional durability, precise control, and consistent performance. Manufactured from premium alloys and designed for demanding turbocharged and naturally aspirated applications, they ensure reliable valvetrain stability at elevated RPM and boost levels.

• Revs up to 10,000 RPM with Manley titanium retainers
• Designed to handle aftermarket camshafts
• Wound from super clean alloy

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Alpha Series Valve Spring And Retainer Kit; Seat Pressure 50 Lbs At 1.400 in.; Open Pressure 205 Lbs At 0.900 in.; Coil Bind 0.880 in.; Incl. Dual Valve Springs/Titanium Retainers;

• Open Pressure 205 lbs. at 0.900 in.
• Seat Pressure 50 lbs. at 1.400 in.
• Coil Bind 0.880 in.
• For H Series

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Skunk2 is proud to introduce its Alpha Valve Spring and Titanium Retainer Kit for Honda's D-series VTEC engines. Each kit includes Skunk2's high-quality valve springs and race-proven titanium retainers that are the result of nearly two decades of racing and engine building experience. Manufactured exclusively from super-clean, chrome-silicone wire milled in Japan, Skunk2's Alpha Valve Springs for Honda's D-series VTEC engines are a product of the company's years of racing and engine building experiences. Alpha Valve Springs are able to prevent valve float and maintain valvetrain stability at engine speeds in excess of 10,000 rpm. Skunk2's industry-leading Alpha Titanium Retainers are designed to significantly reduce valvetrain mass, resulting in more horsepower and improved valvetrain stability. Similar to Skunk2's already popular Pro Series Titanium Retainers, Alpha Titanium Retainers feature radius-cut edges for additional rocker arm clearance and reduced weight, strategically positioned lightening grooves, and reduced overall heights for better valve seal clearance and even further weight reduction. Alpha Titanium Retainers are manufactured using the latest 3D CAD (Computer Aided Design) and FEA (Finite Element Analysis) to ensure that each is optimized for strength as well as for reduced weight. Skunk2 engineers then test and prove their designs on the engine dyno as well as the race track. Once approved for manufacturing, only medical-grade titanium that's been ultrasonically inspected and certified is used. Following CNC machining, each retainer is then individually inspected to ensure proper hole diameter, taper, and that each are free from machining defects to ensure proper installed valve spring heights and pressures.

• Open Pressure 168 lbs.
• Seat Pressure 62 lbs.

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Skunk2 is proud to introduce its Alpha Valve Spring and Titanium Retainer Kit for Honda's B-series VTEC engines. Each kit includes Skunk2's high-quality dual valve springs and race-proven titanium retainers that are the result of nearly two decades of racing and engine building experience. Each Alpha Valve Spring is manufactured exclusively from super-clean, chrome-silicone wire milled in Japan. By using inner and outer springs mated together through a slight interference fit and with differing frequencies, Alpha Valve Springs are able to prevent valve float and maintain valvetrain stability at engine speeds in excess of 10,000 rpm. Skunk2's industry-leading Alpha Titanium Retainers are designed to significantly reduce valvetrain mass, resulting in more horsepower and improved valvetrain stability. Similar to Skunk2's already popular Pro Series Titanium Retainers, Alpha Titanium Retainers feature radius-cut edges for additional rocker arm clearance and reduced weight, strategically positioned lightening grooves, and reduced overall heights for better valve seal clearance and even further weight reduction. Alpha Titanium Retainers are manufactured using the latest 3D CAD (Computer Aided Design) and FEA (Finite Element Analysis) to ensure that each is optimized for strength as well as for reduced weight. Skunk2 engineers then test and prove their designs on the engine dyno as well as the race track. Once approved for manufacturing, only medical-grade titanium that's been ultrasonically inspected and certified is used. Following CNC machining, each retainer is then individually inspected to ensure proper hole diameter, taper, and that each are free from machining defects to ensure proper installed valve spring heights and pressures.

• Open Pressure 210 lbs. At 0.820 in.
• Seat Pressure 68 lbs. At 1.320 in.
• Coil Bind 0.800 in.

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Skunk2 Valve Keepers / Locks for Honda/Acura B/D/F/H VTEC and K Series VTEC Engines. Manufactured from bar stock and CNC machined for precision fit and finish. The Skunk2 Keeper / Locks are then heat-treated for ultimate strength and completed with Black Oxide for corrosive resistance and a great appearance. One set includes 32 pieces (enough for 16 valves) that fit factory and aftermarket 5.5mm valves. These keepers are 7 degree and work with most all retainers both OEM and aftermarket.

• 7 Degree Keeper Seat
• 5.5mm Valve
• Set Of 32

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Skunk2's Viton Valve Stem Seals for popular Honda engines are designed to provide exceptional lubrication while keeping oil out of the combustion chamber. Only Viton is able to provide precise oil control and maximum durability, even at high rpm. Unlike OEM Honda valve stem seals that use different materials for both intake and exhaust seals, all Skunk2 seals exceed OEM specifications and are manufactured from high-quality Viton. Each seal also features stiffer retaining springs for a precise fit. The results are a seal that's resistant to extreme heat, oil additives, and abrasion. High-quality valve stem seals are vital to an engine's performance and longevity. Skunk2's Viton Valve Stem Seals ensure that each valve stem remains properly lubricated without allowing oil into the combustion chamber.

• Stiffer Retaining Springs For A Precise Fit
• For Honda Engines Using A 5.5mm Valve Stem
• Manufactured From High-Quality Viton
• Keeps Oil Out Of Combustion Chamber
• Provides Exceptional Lubrication
• Exceeds OEM Specifications

Skunk2's high-quality Spring Bases for Honda's H-series VTEC engines are designed to allow any H-series VTEC cylinder head to accept Skunk2's higher-performance, Pro Series Valve Springs and Titanium Retainers originally designed for B-series engines. Each Spring Base is manufactured using the latest 3D CAD (Computer Aided Design) and FEA (Finite Element Analysis) to make sure the design is optimized for strength and longevity. Engineers then test and prove the design on the engine dyno. Once approved for manufacturing, engineers make sure to only use high-quality steel that's been ultrasonically inspected and certified. After CNC machining, each Spring Base is then individually inspected to ensure proper dimensions and that it's free from machining defects. Skunk2 designs, develops, and tests its entire valvetrain lineup in-house to ensure superior quality and maximum performance gains. During development, each valvetrain component is tested both on the dyno and the road. Manufactured from the best materials available, Skunk2 valvetrain components provide exceptional performance, reliability, and quality and remain standard-issue on each Skunk2 vehicle that we build and support.

• 0.480 in. Inner Diameter
• Set of 16

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Skunk2 is proud to introduce its Pro Series XP (Extra Pressure) Racing Valve Spring Kits for the Honda K-series i-VTEC engines. Each kit includes Skunk2's high-quality race-proven dual valve springs that are the result of nearly two decades of racing and engine building experience. 'XP' features a higher seat pressure for turbocharged and extreme high RPM motors. This spring has a seat pressure of 100lbs @ 1.600 in. while keeping the coil bind height for higher lift camshafts. Each Pro Series XP Racing Valve Spring is manufactured exclusively from super-clean, chrome-silicone wire milled in Japan. By using inner and outer springs mated together through a slight interference fit and with differing frequencies, Pro Series XP Racing Valve Springs are able to prevent valve float and maintain valvetrain stability at engine speeds in excess of 11,000 rpm. Wound by a premier North American winder, our Pro Series XP Racing Valve Springs retains its durability and strength that results in improvement to the extreme fatigue limit of the wire and enhanced resistance to load loss. Pro Series XP Racing Valve Springs are engineered to handle the demands of extreme-lift camshafts operating at prolonged, high-rpm use at championship-level racing. Skunk2's Pro Series XP Racing Valve Spring's for the Honda's K-series i-VTEC engines are simply the best on the market. Pro Series XP Racing Valve Springs have been tested at speeds exceeding 11,000 rpm on our engine dyno, street, and the race track. Our superior, Japanese-milled, super-clean chrome silicone wire is 100-percent eddy-current inspected prior to coiling. Next, they are heat-treated, shot-peened, and chemically polished for strength and durability. A special nitriding process concludes Skunk2's rigorous manufacturing process.

• Prevents Valve Float/Maintain Valvetrain Stability +10000rpm
• Manufactured From Super-Clean Chrome-Silicone Wire
• Seat Pressure 100 lbs. At 1.600 in.
• Open Pressure 255 lbs. At 1.100 in.
• Coil Bind 0.890 in.
• Max Lift 0.680 in.
• Set of 16

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Skunk2 is proud to introduce its Pro Series XP (Extra Pressure) Racing Valve Spring Kits for the Honda B-series VTEC engines. Each kit includes Skunk2's high-quality race-proven dual valve springs that are the result of nearly two decades of racing and engine building experience. 'XP' features a higher seat pressure for turbocharged and extreme high RPM motors. This spring has a seat pressure of 93lbs @ 1.320 in. while keeping the coil bind height for higher lift camshafts. Each Pro Series XP Racing Valve Spring is manufactured exclusively from super-clean, chrome-silicone wire milled in Japan. By using inner and outer springs mated together through a slight interference fit and with differing frequencies, Pro Series XP Racing Valve Springs are able to prevent valve float and maintain valvetrain stability at engine speeds in excess of 11,000 rpm. Wound by a premier North American winder, our Pro Series XP Racing Valve Springs retains its durability and strength that results in improvement to the extreme fatigue limit of the wire and enhanced resistance to load loss. Pro Series XP Racing Valve Springs are engineered to handle the demands of extreme-lift camshafts operating at prolonged, high-rpm use at championship-level racing. Skunk2's Pro Series XP Racing Valve Spring's for the Honda's B-series VTEC engines are simply the best on the market. Pro Series XP Racing Valve Springs have been tested at speeds exceeding 11,000 rpm on our engine dyno, street, and the race track. Our superior, Japanese-milled, super-clean chrome silicone wire is 100-percent eddy-current inspected prior to coiling. Next, they are heat-treated, shot-peened, and chemically polished for strength and durability. A special nitriding process concludes Skunk2's rigorous manufacturing process. The end result is a lightweight valve spring that safely accommodates high-lift camshafts and features superior resistance to load loss, even under extreme operating conditions.

• Prevents Valve Float/Maintain Valvetrain Stability +10000rpm
• Manufactured From Super-Clean Chrome-Silicone Wire
• Open Pressure 238 lbs. At 0.820 in.
• Seat Pressure 93 lbs. At 1.320 in.
• Coil Bind 0.718 in.
• Set of 16

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Manufactured exclusively from super-clean, chrome-silicone wire milled in Japan, Skunk2's Alpha Valve Springs for Honda/Acura K-series VTEC engines are a product of the company's years of racing and engine building experiences. By using inner and outer springs mated together through a slight interference fit and with differing frequencies, Alpha Valve Springs are able to prevent valve float and maintain valvetrain stability at engine speeds in excess of 10,000 rpm. Skunk2 designs, develops, and tests its entire valvetrain lineup in-house to ensure superior quality and maximum performance gains. During development, each valvetrain component is tested both on the dyno and the road, including 11,000 rpm drag racing engines and 17,000 rpm superbikes. Manufactured from the best materials available, Skunk2 valvetrain components provide exceptional performance, reliability, and quality and remain standard-issue on each Skunk2 vehicle that we build and support.

• Prevents Valve Float/Maintain Valvetrain Stability +10000rpm
• Manufactured From 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.
• Set of 16

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Manufactured exclusively from super-clean, chrome-silicone wire milled in Japan, Skunk2's Alpha Valve Springs for Honda's D-series VTEC engines are a product of the company's years of racing and engine building experiences. Alpha Valve Springs are able to prevent valve float and maintain valvetrain stability at engine speeds in excess of 10,000 rpm. Skunk2 designs, develops, and tests its entire valvetrain lineup in-house to ensure superior quality and maximum performance gains. During development, each valvetrain component is tested both on the dyno and the road, including 11,000 rpm drag racing engines and 17,000 rpm superbikes. Manufactured from the best materials available, Skunk2 valvetrain components provide exceptional performance, reliability, and quality and remain standard-issue on each Skunk2 vehicle that we build and support.

• Prevents Valve Float/Maintain Valvetrain Stability +10000rpm
• Manufactured From Super-Clean Chrome-Silicone Wire
• Open Pressure 205 lbs. at 0.900 in.
• Seat Pressure 50 lbs. at 1.400 in.
• Coil Bind 0.880 in.
• Set of 16

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Alpha Series Valve Spring Set; Seat Pressure 68 Lbs At 1.320 in.; Open Pressure 210 Lbs At 0.820 in.; Coil Bind 0.800 in.; Set of 16;

• Prevents Valve Float/Maintain Valvetrain Stability +10000rpm
• Manufactured From Super-Clean Chrome-Silicone Wire
• Open Pressure 210 lbs. At 0.820 in.
• Seat Pressure 68 lbs. At 1.320 in.
• Coil Bind 0.800 in.
• Set of 16

This Part Fits:

Manufactured exclusively from super-clean, chrome-silicone wire milled in Japan, Skunk2's Alpha Valve Springs for Honda's D-series VTEC engines are a product of the company's years of racing and engine building experiences. Alpha Valve Springs are able to prevent valve float and maintain valvetrain stability at engine speeds in excess of 10,000 rpm. Skunk2 designs, develops, and tests its entire valvetrain lineup in-house to ensure superior quality and maximum performance gains. During development, each valvetrain component is tested both on the dyno and the road, including 11,000 rpm drag racing engines and 17,000 rpm superbikes. Manufactured from the best materials available, Skunk2 valvetrain components provide exceptional performance, reliability, and quality and remain standard-issue on each Skunk2 vehicle that we build and support.

• Prevents Valve Float/Maintain Valvetrain Stability +10000rpm
• Manufactured From Super-Clean Chrome-Silicone Wire
• Open Pressure 158 lbs.
• Seat Pressure 62 lbs.
• Set of 16

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Skunk2's industry-leading Alpha Titanium Retainers are designed to significantly reduce valvetrain mass, resulting in more horsepower and improved valvetrain stability. Similar to Skunk2's already popular Pro Series Titanium Retainers, Alpha Titanium Retainers feature radius-cut edges for additional rocker arm clearance and reduced weight, strategically positioned lightening grooves, and reduced overall heights for better valve seal clearance and even further weight reduction. Alpha Titanium Retainers are manufactured using the latest 3D CAD (Computer Aided Design) and FEA (Finite Element Analysis) to ensure that each is optimized for strength as well as for reduced weight. Skunk2 engineers then test and prove their designs on the engine dyno as well as the race track. Once approved for manufacturing, only medical-grade titanium that's been ultrasonically inspected and certified is used. Following CNC machining, each retainer is then individually inspected to ensure proper hole diameter, taper, and that each are free from machining defects to ensure proper installed valve spring heights and pressures. Finally, each retainer is serialized for your protection, including valuable information, like material batch specifics as well as production and inspection dates. Skunk2 designs, develops, and tests its entire valvetrain lineup in-house to ensure superior quality and maximum performance gains. During development, each valvetrain component is tested both on the dyno and the road, including 11,000 rpm drag racing engines and 17,000 rpm superbikes. Manufactured from the best materials available, Skunk2 valvetrain components provide exceptional performance, reliability, and quality and remain standard-issue on each Skunk2 vehicle that we build and support. Skunk2 designs, develops, and tests its entire valvetrain lineup in-house to ensure superior quality and maximum performance gains.

• Exceptional Performance/Reliability/Quality
• Manufactured W/ 3D Cad And Fea

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Skunk2's industry-leading Titanium Retainers for Honda's K-series engines are designed to significantly reduce valvetrain mass, resulting in more horsepower and improved valvetrain stability. Unlink other retainers, Skunk2 Titanium Retainers feature radius-cut edges for additional rocker arm clearance and reduced weight, strategically positioned lightening grooves, and reduced overall heights for better valve seal clearance and even further weight reduction. All Skunk2 Titanium Retainers are manufactured using the latest 3D CAD (Computer Aided Design) and FEA (Finite Element Analysis) to ensure that each is optimized for strength as well as for reduced weight. Skunk2 engineers then test and prove their designs on the engine dyno as well as the race track. Once approved for manufacturing, only medical-grade titanium that's been ultrasonically inspected and certified is used. Following CNC machining, each retainer is then individually inspected to ensure proper hole diameter, taper, and that each are free from machining defects to ensure proper installed valve spring heights and pressures. Finally, each Titanium Retainer is serialized for your protection, including valuable information, like material batch specifics as well as production and inspection dates. Skunk2 designs, develops, and tests its entire valvetrain lineup in-house to ensure superior quality and maximum performance gains. During development, each valvetrain component is tested both on the dyno and the road, including 11,000 rpm drag racing engines and 17,000 rpm superbikes. Manufactured from the best materials available, Skunk2 valvetrain components provide exceptional performance, reliability, and quality and remain standard-issue on each Skunk2 vehicle that we build and support.

• Titanium Constructed; 42% Lighter Than OEM Steel Retainers
• Pair w/Tuner Series Or Pro Series Valve Springs
• Set of 16

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