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Description
Valve Spring Kit - Supertech - SR20DET S14/S15Complete kit of 16x Valve springs, Retainers and Spring seats for Nissan 200SX S14 S14A S15. SUPERTECH uses their experience of more than 20 years in the manufacturing of racing valve springs retainers & valvetrain components, along with the application of computerized Finite Element Analysis (FEA). They perform intensive testing and work closely with many engine builders in order to continuously improve and provide the market with the best possible
Complete kit of 16x Valve springs, Retainers and Spring seats for Nissan 200SX S14 / S14A / S15. SUPERTECH uses their experience of more than 20 years in the manufacturing of racing valve springs retainers & valvetrain components, along with the application of computerized Finite Element Analysis (FEA). They perform intensive testing and work closely with many engine builders in order to continuously improve and provide the market with the best possible product for every application. SUPERTECH valve springs are made with premium Superclean Chrome Silicon Vanadium Steel alloy for higher performance & durability at high RPMs and better memory. They are computer designed to ensure that wire stress levels do not overpass the limits of stress defined in the diagrams of fatigue for long durability under extreme conditions. Proprietary computer programs aid in maintaining harmonic control. Retainers are manufactured with high quality military certified Titanium alloy, CNC machined for a tight fit that will ensure long durability. SUPERTECH also manufactures quality high-performance valve guides, cam followers, keepers & spring seats. SUPERTECH VALVE SPRINGS feature: Finite Element Analysis (FEA) design Superclean Chrome Silicon Vanadium Steel alloyHigher than stock seat & open pressures for high-lift, long duration cams.Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.5 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
True to size and comfort.
Color: Black - Set 3, Size: 7X-Large
Great product and true to size. It's comfortable and not to tight. I will be ordering more in the future.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
this is my go to when needing new underwear.
Size: 3X-Large, Color: Black/Navy/Dark Purple/Red
Love these boyshorts for women. They're so comfortable, no crawling and breathable. I recommend for plus size women who has legs rubbing together causing irritation. Nice price as well. This is my go to when needing new underwear.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Great!
Size: Small, Color: Black/Heather Gray/White/Nude
Comfy, good fit, good quality cotton and flat seams around the crotch. Normal size small. I wouldn’t wear these with yoga pants, but nice under looser fitting garments. I would buy more colors.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
There is a seam up the front. I think perhaps it being seamless would be better.
Size: Medium, Color: Black
Like anything off Amazon I wasnt expecting anything perfect and ready to have to mail it back.
Pleasantly surprised by the softness and durability. The waist band isn't to small on a medium so it fits actually so comfy.
I wear them as underwear and as shorts for my skirts n dresses.
Id recommend but I say size up if you want a comfy fit. But down if you want a fitted fit fit. Comfy still is fitted but better feeling on if that makes sense.
Also the crotch of the shorts/undies has essentially extra fabric sewed in creating that nice comfort. Ill snag a photo when I have time.
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Reviewed in the United States on May 3, 2026
★★★★★ 4
Product varies from package to package
Size: X-Large, Color: Black/Navy/Dark Purple/Red
Over a two year period this is my 4th purchase. They started as sleep shorts and have replaced other underwear most of the time because they are comfortable and the quality is pretty good. However there are differences in between every package. The length has varied up to an inch, the material has changed, and some are slightly tighter than others. That said it works for me. I am a side sleeper and sometimes the side seam bothers me.
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Reviewed in the United States on March 9, 2026