# Manley GM LS Series .660in Max Lift Valve Spring and Retainer Kit

Manley Performance LS & LT NexTek® valve spring kits take the guess work out of making your valvetrain race-ready. Engineered for maximum durability, stability, and precision in high-performance and racing applications, these chrome-silicon alloy springs provide exceptional fatigue resistance and high-tensile strength, ensuring consistent valve control at extreme RPMs. Save time and money with these all-inclusive kits, featuring premium springs, retainers, I.D. locators, locks, and Viton? seals.

-   Manley LS and LT Valve Spring Kits provide a complete, engineered solution, ensuring seamless compatibility for higher-lift camshafts and eliminating concerns with mismatched components.
-   NexTek Valve Springs are manufactured from "super clean" Hi-Tensile Chrome Silicon steel and shot-peened to MIL spec for maximum fatigue life. Spring No. 221436-16
-   7 Machined Valve Locks use the highest quality steel alloy and are heat treated and black oxide finished. For 8mm (.3135") valve stem. Lock No. 13098-16
-   7 Steel Retainer CNC machined to exacting tolerances and made of thru-hardened 4140 chromoly. Retainer No. 23621-16 (+.050" Installed Height)
-   I.D. Valve Spring Locator is CNC machined, heat treated, and black oxide finished. Locator No. 42334-16 (.505" ID)
-   Viton Valve Stem Seals offer exceptional resistance to heat, chemicals, and oils. Seal No. 24042-16
-   Note: Max. lift figures above may vary depending upon the cylinder head and installed height.

## Details

- **Price:** 665.24 CAD
- **Vendor:** Manley Performance
- **Type:** Valve Springs, Retainers

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 665.24 CAD | In stock |

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/manley-gm-ls-series-660in-max-lift-valve-spring-and-retainer-kit)
> Updated: 2026-09-01