SKU: 2759352167

Supertech HIVN-1021D - Supertech Performance Valves - Honda RSX / K20 Intake Valve 35.50x5.48x108.85mm/S

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Description

Supertech HIVN-1021D - Supertech Performance Valves - Honda RSX / K20 Intake Valve 35.50x5.48x108.85mm/SSupertech HIVN 1021D Supertech Performance Valves Honda RSX K20 Intake Valve 35. 50x5. 48x108. 85mm S Supertech valves are the best on the market, made from one piece of forged stainless steel for the ultimate in strength and durability. Supertech valves go through a special heat treatment process that obtains the right amount of harness for each engine to ensure the ultimate valve for your performance motor. Supertech offers their valves in either

Supertech HIVN-1021D - Supertech Performance Valves - Honda RSX / K20 Intake Valve 35.50x5.48x108.85mm/S

Supertech valves are the best on the market, made from one piece of forged stainless steel for the ultimate in strength and durability. Supertech valves go through a special heat treatment process that obtains the right amount of harness for each engine to ensure the ultimate valve for your performance motor. Supertech offers their valves in either chrome coating, used in high performance valves, or hardened black nitrided which is most popular in European and Japanese motors.

Supertech High Performance Race Engine Valves features:

  • The microhardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (microhardness is 800HV minimum)
  • Surface finish is smoother than with chromed stems, having less friction between stem and guide.
  • Valve seat surface is harder with the nitrided layer, lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes. Matches any kind of seats (nodular iron seats, steel powder metal seats, hard aluminum-copper seats or beryllium copper seats).
  • Higher rpm's engines take full advantage of all previous features. The higher the engine speed the bigger the power loss due to internal engine friction! The black nitride layer reduces this power loss due to less valve-guide friction.
  • The nitrided layer is adhered to the base material at a microscopic level, so does not"flake" or brake when the valves bend due to impacts with the pistons.
  • The Black Nitride applies to the whole valve while the chrome coating is only applied to the stem.
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: 2759352167

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Chris
Lake Worth, US
★★★★★ 5
BEAUTIFUL.
Style: Zinnia Dahlia
Great seeds, good germination.
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Reviewed in the United States on May 23, 2026
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April
Natrona Heights, US
★★★★★ 5
Easy to grow
Style: Zinnia Dahlia, Style: Zinnia Dahlia
I have bought several packets of seeds lately, and a lot of them were duds. These seeds sprouted so quickly! Thank you so much for a great product
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Reviewed in the United States on June 1, 2026
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Amazon Customer
West Palm Beach, US
★★★★★ 5
customer
Style: Zinnia Dahlia
This package had more than the pkg that was supposed to have 4000, but they are coming up slowly. It is dry here, I have been watering , just enough to get the ground wet and they are scattered, but some are coming up. I also watered the space supposedly where i spread seeds from the supposedly 4000 seeds pkg. They are not coming up as much!
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Reviewed in the United States on May 17, 2026
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Justin Pone
Natrona Heights, US
★★★★★ 5
3 days and already sprouting
Style: Zinnia Dahlia, Style: Zinnia Dahlia
I planted these seeds three days ago. They’ve had pure sun these last three days with water that I’ve given them and they’re already starting to sprout. I could not recommend these more if I tried.
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Reviewed in the United States on June 6, 2026
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josh
Carnegie, US
★★★★★ 4
Didn’t get a review on the garlic powder
Style: Zinnia Dahlia
The seeds were okay but the garlic powder that I ordered was smaller than usual is a case of bait and switch
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Reviewed in the United States on May 31, 2026

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