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Engines and Components› Camshafts and Valvetrain

Supertech

Dual Valve Spring and Retainer Kit

Name: Dual Valve Spring and Retainer Kit
Brand: Supertech
SKU: SPRK-H1021D-T1
Price: 606.00 USD
Availability: InStock

$606.00

SKU: SPRK-H1021D-T1

Special Order

Ships in 4–6 weeks

Free Shipping over $200

$100 Minimum Order

30 Days Return

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Supertech valve spring and retainer kit is a precision-matched valvetrain assembly designed for high-performance engine applications. Constructed from an extreme pure chrome-silicon-vanadium-steel alloy, these dual valve springs are engineered to maintain durability and consistency at high engine revolutions.

Show original supplier description

The Supertech valve spring and retainer kit provides a complete valvetrain upgrade for the 2000-2009 Honda S2000 and 2002-2004 Acura RSX Type-S (K20A2 engine). These precision-matched components are developed for performance enthusiasts seeking increased reliability, quality, and responsiveness during high-RPM operation. Each kit features dual valve springs manufactured from an extreme pure chrome-silicon-vanadium-steel alloy, which provides excellent fatigue resistance for performance engines. Technical specifications include a seat pressure of 95 lbs at 26.5mm, an open pressure of 261 lbs at 12mm, and a maximum net lift of 17.7mm, with a coil bind height of 22.7mm. The inner springs feature a 21.3mm outer diameter and 15.5mm inner diameter, while the outer springs have a 30mm outer diameter and 21.8mm inner diameter, with a spring rate of 13.2 lbs/mm.

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

Brand	Supertech
Part Number	SPRK-H1021D-T1
Category	Engines and Components

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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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