What is the installed height for these valve springs?

These Manley NexTek Series valve springs are designed for a 1.125 inch installed height. It's important to ensure this matches your camshaft and cylinder head specifications for proper operation.

Are these springs suitable for a stock engine?

While these springs are well-built, they are specifically intended for street and strip applications, meaning they are designed for modified engines. For a completely stock engine, factory-style replacements might be more appropriate.

What does '2 valves per cylinder' mean for this part?

This means the kit contains 16 springs, which is the correct quantity for an 8-cylinder engine where each cylinder has two valves (one intake and one exhaust).

Specifications

Brand: Manley Performance
Part #: 221427-16
UPC: 807298023991

Manley Ford 4.6L/5.4L SOHC NexTek Series Street/Strip 1.125 Valve Springs (2 valves per cylinder

Name: Manley Ford 4.6L/5.4L SOHC NexTek Series Street/Strip 1.125 Valve Springs (2 valves per cylinder
Brand: Manley Performance
SKU: manley-performance-manley-ford-4-6l-5-4l-sohc-nextek-series-street-strip-1-125-v-t14-4313776
Price: 389.32 USD
Availability: BackOrder

$389.32

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1996-2004 Ford Mustang. Manley NexTek Series valve springs for 4.6L/5.4L SOHC engines, designed for street and strip use.

Key Features

Fits 1996-2004 Ford Mustang, 1997-2003 Ford F-150 with 4.6L/5.4L SOHC engines.
Manley NexTek Series valve springs are built for street and strip applications.
Designed for a 1.125 inch installed height, suitable for modified camshafts.
Well-built by Manley Performance, a known name in engine components.
Includes 16 springs, enough for 2 valves per cylinder on 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

If you're working on a 1996-2004 Ford Mustang with a 4.6L or 5.4L SOHC engine, these Manley NexTek Series valve springs are a solid option for street and strip builds. They are designed to handle the demands of modified engines, ensuring your valvetrain stays in sync under increased stress.

Manley has a reputation for well-built engine components, and these springs are no exception. They are made from strong materials and are intended to provide reliable performance for applications that see more than just daily driving. The 1.125 inch installed height is a key specification to ensure they work correctly with your specific camshaft and cylinder head setup, especially when you're aiming for improved performance beyond stock.

When rebuilding or modifying your engine, choosing the right valve springs is crucial for proper valvetrain operation and longevity. These Manley springs are a popular choice for enthusiasts looking to upgrade their Mustang's engine for spirited driving or track use.