Valve Spring Kit

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.

Additional Information

Pro Series XP Valve Spring Set; 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;

Product Overview

Skunk2 is proud to introduce its Pro Series XP (Extra Pressure) Racing Valve Spring Kits for Honda’s B-series VTEC and 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 at 1.600” for the K-Series and 93lbs at 1.320” for the B-Series engines 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 Honda’s B-series VTEC and 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. 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.

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. These components remain standard-issue on each Skunk2 vehicle that we build and support.

These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.

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

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Product Details

Reference Information

Valvetrain, Pro XP Series Valve Spring Set 02-11 Honda Civic Si K20/K24/F20C/F22C

Skunk2 Racing Pro XP valve springs feature a higher seat pressure for turbocharged and extreme high-rpm motors. They offer a higher seat pressure while keeping the coil bind height for higher lift camshafts.

The XP (Extra Pressure) springs are race-proven, dual valve springs produced exclusively from super-clean, chrome-silicone wire milled in Japan, while their design helps prevent valve float and maintains valvetrain stability at engine speeds in excess of 11,000 rpm. They are expertly wound, heat-treated, shot-peened, and chemically polished for durability and strength, resulting in lightweight valve springs that safely accommodate high-lift camshafts and feature superior resistance to load loss, even under extreme operating conditions. Choose the proper set of Skunk2 Racing Pro XP valve springs for your vehicle.