Engines and Components› Camshafts and Valvetrain

Manley Performance

SPRING-1.324 DOUBLE

$550.54

SKU: M004 221421-16

In Stock
In Stock
Ships by Jun 7
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

Manley NexTek Performance Street/Strip Valve Springs are designed for SBC LS-Series and LT1 engines. Made from specially processed premium-grade chrome silicon, these double valve springs are fully polished and offer enhanced performance for street and strip applications. They feature a 1.324" outer diameter, 165 lbs seat pressure at 1.800", and 515 lbs open pressure at 1.000". This set includes 16 springs.

Fitment

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Specifications

BrandManley Performance
Part NumberM004 221421-16

Videos

Valve Springs: How to Choose, Set Up & Install Them Right (For Your BUILD!)

Valve Springs: How to Choose, Set Up & Install Them Right (For Your BUILD!)
Understand THIS Before Buying Valve Springs | Valvetrain Terminology 101 - Jays Tech Tip

Understand THIS Before Buying Valve Springs | Valvetrain Terminology 101 - Jays Tech Tip
How To Install Dual Valve Springs - Texas Speed & Performance Dual Valve Spring Install

How To Install Dual Valve Springs - Texas Speed & Performance Dual Valve Spring Install

Buy with Confidence

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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