SKU: 43689116843

Skunk2 Racing Pro Series XP Valve Spring Set (311-05-7380)

Sale price$173.71 Regular price$193.01
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Ships within 48 hours · Estimated delivery Aug 20 - Aug 25

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Description

Skunk2 Racing Pro Series XP Valve Spring Set (311-05-7380)Seat Pressure: 100 lbs at 1. 600in. Open Pressure: 255 lbs at 1. 100in. Coil Bind: . 890in. Max Lift: . 680in. Must Use Skunk2 P N: 312 05 0010 (Spring Bases) to Install Dual Springs in Single Spring K Heads or to Install in F20C F22C Engines. 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

Seat Pressure: 100 lbs at 1.600in.-Open Pressure: 255 lbs at 1.100in.-Coil Bind: .890in.-Max Lift: .680in. Must Use Skunk2 P/N: 312-05-0010 (Spring Bases) to Install Dual Springs in Single Spring K Heads or to Install in F20C/F22C Engines. 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" 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.

Features

  • Designed for proper valves operation
  • Springs prevent valve float maintain valvetrain
  • Retainers significantly reduce valvetrain mass to increase valvetrain stability and horsepower
  • Springs are made of chrome-silicone wire
  • Springs maintain valvetrain stability engine at speeds more than 10,000 rpm
  • Backed by a one-year warranty
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 43689116843

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4.2 ★★★★★
Based on 12 reviews
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Campbell1951
San Leandro, US
★★★★★ 5
Great Shorts
Size: 38, Color: Grain Twill
Ok.... I have bought these several times, the shorts aren't wearing out or tearing, I am losing weight,.... I like these shorts so much, I keep buying them in my new size... Every size (44 42 40 and 38) has fit well, good length, and are comfortable... Pockets are functional, left side fits my smart phone... Yes, I will buy them again....
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Reviewed in the United States on May 16, 2026
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Verified Purchase
GradyW
Dallas, US
★★★★★ 4
Lightweight and comfortable
Size: 42, Color: Kangaroo, Size: 42, Color: Kangaroo
The fit is just right and they're very comfortable. This is the second pair I've bought and the review could easily be for both pairs. The only difference between them is the color. I deducted a star because they really need at least 2 more belt loops. Why do manufacturers skimp on something that would be so inexpensive to do right? The belt loops on either side of the front button are 11 inches apart. Ideally they'd be at most 5 or 6 inches apart. Anyway, these will be the shorts I wear to do my yard work. I can put my phone in the right hand cargo pocket and know that the Velcro closure won't let it fall out while I'm working. My keys will go in the left side cargo pocket. I'd definitely buy them again. The price is right and they are comfortable to wear.
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Reviewed in the United States on May 12, 2026
B
Verified Purchase
BW
Alexandria, US
★★★★★ 5
Very well designed shorts!
Size: 36, Color: Gunmetal
Bought one pair awhile ago, and now buying several more. Great relaxed fit, very comfortable, good fabric weight AND pockets not designed by morons - actually so easy to store and retrieve wallet and phone unlike Dockers and Izod and other cargo shorts I've purchased in the past. So comfortable and well designed. They're cut a little large for the stated size - but not necessarily a bad thing, and waist has a little bit of stretch. Love them!
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Reviewed in the United States on May 22, 2026
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Verified Purchase
Dennis L
Natrona Heights, US
★★★★★ 5
Once you put them on, you will know you made the right decision
Size: 38, Color: Medium Tint Denim
Absolutely perfect in every way. Staring either the very reasonable price, the true to size fit, and quality. Hip pockets are deep, and can come in handy. Most don’t know that Wrangler actually started in 1904 as a company called Blue Bell, and later renamed Wrangler. Well established and a long history of top quality clothing. Although you may find another company selling for a bit less, that’s what you’ll get……Less !!?
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Reviewed in the United States on May 2, 2026
E
Verified Purchase
Erik
Boise, US
★★★★★ 5
Good shorts but they run big
Size: 38, Color: Dusty Olive
I've been losing weight and picked these up in my new size (38). It turns out these are cut for a generous American midsection, and have an elastic fit in the waist, so you can (and probably should!) safely go down a size. I got mine in 34 instead and they fit great.
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Reviewed in the United States on May 22, 2026

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