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Engines and Components› Camshafts and Valvetrain

Supertech

Supertech Dual Valve Spring Conversion Kit for K-series Engines

$860.68 $637.95 Save $222.73

SKU: SPR-H1021D/RET-K20A2/T2/SEAT-H1020DS/KPR-5.5/7A

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$100 Minimum Order
30 Days Return
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Overview

The Supertech Dual Valve Spring Conversion Kit is a high-performance valvetrain upgrade designed for K-series engines. This kit includes Supertech SPR-H1021D dual springs, RET-K20A2/T2 retainers, and SEAT-H1020D valve seats. It is engineered to handle increased lift and provides a seated pressure of 92 lbs at 40.40mm and an open pressure of 253 lbs at 12mm. The maximum lift supported is 17.70mm, with a coil bind occurring at 22.70mm, and a spring rate of 13.20 lbs/mm.

This comprehensive kit is ideal for enthusiasts looking to enhance the performance and reliability of their K-series Honda or Acura engine. It is specifically assembled for K-series applications to ensure optimal fitment and function.
Show original supplier description
The Supertech Dual Valve Spring Conversion Kit is a high-performance valvetrain upgrade designed for K-series engines. This kit includes Supertech SPR-H1021D dual springs, RET-K20A2/T2 retainers, and SEAT-H1020D valve seats. It is engineered to handle increased lift and provides a seated pressure of 92 lbs at 40.40mm and an open pressure of 253 lbs at 12mm. The maximum lift supported is 17.70mm, with a coil bind occurring at 22.70mm, and a spring rate of 13.20 lbs/mm. This comprehensive kit is ideal for enthusiasts looking to enhance the performance and reliability of their K-series Honda or Acura engine. It is specifically assembled for K-series applications to ensure optimal fitment and function.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSupertech
Part NumberSPR-H1021D/RET-K20A2/T2/SEAT-H1020DS/KPR-5.5/7A
CategoryEngines and Components

Videos

Installing Supertech Dual Valve Springs On My GSR Head!!

Installing Supertech Dual Valve Springs On My GSR Head!!
SuperTech Valves - Watch This.

SuperTech Valves - Watch This.
k24 with supertech springs and titanium retainers

k24 with supertech springs and titanium retainers
Harbor Freight VS. Autozone Valve Compressor Tool | Supertech Spring & Retainer Install D16

Harbor Freight VS. Autozone Valve Compressor Tool | Supertech Spring & Retainer Install D16
INSTALLING SUPERTECH SPRINGS & RETAINERS ON A B18B1

INSTALLING SUPERTECH SPRINGS & RETAINERS ON A B18B1

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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