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VR38 Supertech Valve Spring Kit

Brand New Supertech Performance Dual Valve Springs, Titanium Retainers, and Spring Seats for:

07+ Nissan GTR, GT-R, VR38, VR38DETT 3.8L V6 24v Engines

Spring Kit Part # SPRK-TS1012/GTR

consisting of 24x SPR-TS1012/GTR, 12x RET-TS5.5/T8, 12x RET-TS5.5/T9, 24x, SEAT-TS/GTR

Supertech Valvetrain has proven in a variety of motorsports applications from mild 150 horsepower street engines to 1000+ Horsepower race cars.  Don't be fooled by lesser quality valvetrain components, stick with Supertech and get the quality you deserve for your project that will fit right the first time and offer superior performance and longevity.

Supertech Valve Springs are made with premium Superclean Chrome Silicone Vanadium Steel alloy for higher performance and durability at high RPM's and better memory.  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.  Computer software also allows us to make sure that the harmonics are well under control.

The Supertech Retainers are manufacturer with high quality military certified Titanium alloy, CNC machined for a tight fit that will ensure a long durability.

Spring Specifications:

Outer Spring -- 27.50mm OD -- 20.00mm ID
Inner Spring -- 20.00mm OD -- 15.20mm ID
16.00mm Max Net Lift

20.00mm Coil Bind 
10.50 lbs/mm Rate


  • 1 lb
  • Available
  • Ships within 1-3 days1

Supertech VR38 1mm Oversize Valves

-Stainless steel Intake Valves coated with Black Nitride NIVN 1062

-Inconel Exhaust valves NEVI 1062

This is a hardening treatment that even though it is not widely used as the chrome coating, it has several benefits and is becoming very popular, mainly for European and Japanese applications.

Supertech applies more than 30 years of experience in the development of each and every Supertech racing valve we sell. Combine this experience with state of the art equipment such as ultrasonic tests, x-rays, laser measurement equipment, and applications like computerized Finite Element Analysis (FEA) and it is no wonder why supertech has some of the best performance products on the market.

Supertech VR38 1mm Oversize Valves


  • 3 lb
  • Available
  • Ships within 1-3 days1

Honda S2000 Supertech Valvetrain Kit AP1 AP2

Supertech Dual Valve Springs

The manufacturing of valve springs is more than achieving the required pressure and lift.  There are many other factors to consider when it comes to achieving a superior spring design and when done correctly it makes a big difference in the reliability and successful operation of the springs.


Dual Valve Springs Specifications, Part number Spr-H1021D:

Outer Spring: 30.00mm O.D., 21.80mm I.D.

Inner Spring: 21.30mm O.D., 15.50mm I.D.

Pressure: 95lbs. @ 40.40mm Seat, 253lbs. @ 12mm Open (lift)

Max Net Lift: 17.70mm

Coil Bind: 22.70mm

Rate: 13.20mm


Supertech Black Nitride Valves 


The micro hardness is higher than the stainless steel base material.  Good ductility beneath the hard nitrided layer (micro hardness is 8000HV minimum).  Surface finish is smoother than chromed stems.  Less friction between stem and guide.  Harder valve seat surface, lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes.  Matches any kind of seats (nodular iron, steel powder metal, hard aluminum-copper or be ryllium copper).  Less valve guide friction = reduced power loss.  Nitride layer is adhered to the base material at a microscope level, so it will not "flake" or brake.  Nitride is applied to the whole valve while the chrome coating is only applied to the stem.  All valves are swirl polished, have stem undercuts, a hardened tip and more. 


Black Nitride Valves Specifications, Part number HIVN-1030D & HEVN-1030D:

Intake Valve: Head Diam 36.00mm, Stem Diam 5.48mm, Length 109.85mm (Standard Size - Dished)

Exhaust Valve: Head Diam 31.00mm, Stem Diam 5.45mm, Length 108.80mm (Standard Size - Dished)

Note: Flat Face Valves are also available at buyers request.


What's in the box?

(16) Supertech Dual Valve Springs

(16) Supertech Titanium Retainers

(16) Supertech Valve Spring Seats

(16) Supertech Black Nitride, Standard Size, Dished Intake & Exhaust Valves

(16) Supertech Manganese Bronze Intake & Exhaust Valve Guides

(16) Supertech Intake & Exhaust Valve Stem Seals


Note: All items are of OEM standard size unless otherwise noted.  We can customize any Supertech Performance Valvetrain package for you.  We usually return a response the same day. 

Made to fit:

1999 - 2003 Honda S2000 AP1 F20C

2004 - 2009 Honda S2000 AP2 F22C



1) We ship within 24 hours of complete processed payment with the exception of weekends and holidays.  Delivery is usually 2-4 business within the United States.
2) Free shipping is provided to the lower 48 states.
3) Customers located in Alaska, Hawaii and Puerto Rico should contact us for best possible shipping rates.

Honda S2000 Supertech Valvetrain Kit AP1 AP2


  • 2 lb
  • Available
  • Ships within 1-3 days1