What is the main benefit of using these NexTek valve springs?

These NexTek valve springs are built to handle higher engine speeds and more aggressive camshafts. They help prevent valve float, ensuring reliable valvetrain operation when you push your engine harder.

Are these springs suitable for stock engines?

While these springs are well-built, they are specifically designed for performance applications. They are most beneficial when paired with upgraded camshafts or when increasing the engine's redline. For a completely stock engine, they may be more than necessary.

Do these valve springs come with retainers or other hardware?

This part number includes 16 high-performance valve springs. Retainers and other valvetrain components are typically sold separately and should be confirmed for compatibility.

Specifications

Brand: Manley Performance
Part #: 221437-16
UPC: 807298023441

Manley Ford 4.6L/5.4L SOHC NexTek Series High Performance Valve Springs (2 valves per cylinder)

Name: Manley Ford 4.6L/5.4L SOHC NexTek Series High Performance Valve Springs (2 valves per cylinder)
Brand: Manley Performance
SKU: manley-performance-manley-ford-4-6l-5-4l-sohc-nextek-series-high-performance-val-t14-271771
Price: 415.51 USD
Availability: BackOrder

$415.51

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Fits 1996-2004 Ford Mustang. Manley NexTek Series valve springs for 4.6L/5.4L SOHC engines. These well-built springs handle higher RPMs and aggressive cams.

Key Features

Fits 1996-2004 Ford Mustang, 1997-2003 Ford F-150 with 4.6L/5.4L SOHC engines.
Manufactured with high-tensile, high-performance NexTek wire for durability.
Designed for engines with two valves per cylinder.
Suitable for higher RPM operation and aggressive camshaft upgrades.
Helps prevent valve float at increased engine speeds.
Includes 16 springs, enough for a V8 engine.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

Manley's NexTek Series valve springs are built with a high-tensile, high-performance wire that's designed to handle the demands of modified 4.6L and 5.4L SOHC engines found in your 1996-2004 Ford Mustang. These springs are a solid choice when you're looking to upgrade your valvetrain for improved performance, especially if you're planning on installing a more aggressive camshaft or increasing your engine's redline. They are specifically designed for applications with two valves per cylinder.

The NexTek wire used in these springs offers excellent durability and consistent performance, even under the stress of higher engine speeds. This means you can trust them to keep your valves closing reliably, preventing issues like valve float at higher RPMs. This set includes 16 springs, enough for a V8 engine with two valves per cylinder. They are a direct fit for the specified Mustang models, making installation straightforward for a mechanic.