What is the main benefit of using single valve springs over stock?

Single valve springs offer improved stability for the valvetrain, especially at higher engine speeds. They are designed to prevent valve float, which can occur when stock springs can't keep up with the demands of performance camshafts or increased RPMs.

What other parts are typically needed when installing valve springs?

When replacing valve springs, it's common to also replace valve retainers, seals, and keepers. Depending on the camshafts you are using, you may also need to consider valve guides and the camshafts themselves. Always refer to the manufacturer's installation guide or consult a professional mechanic.

Does this kit include all the necessary hardware for installation?

This kit specifically includes the single valve springs. It is recommended to check the full contents list or consult with a service professional to ensure you have all other required components, such as retainers, seals, and keepers, before beginning installation.

Ferrea Single Valve Spring Kit KT4021 - Scion FR-S/BRZ

Name: Ferrea 12-15 Scion/Subaru FR-S/BRZ Single Spring Kit
Brand: Ferrea
SKU: ferrea-ferrea-12-15-scion-subaru-fr-s-brz-single-spring-kit-t14-418944
Price: 734.52 USD
Availability: BackOrder

Ferrea 12-15 Scion/Subaru FR-S/BRZ Single Spring Kit

$734.52

On Backorder

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

Ferrea 12-15 Scion/Subaru FR-S/BRZ Single Spring Kit

Key Features

Fits 2012-2015 Scion FR-S and Subaru BRZ.
Single valve spring design.
Designed for high-performance engine applications.
Helps maintain valvetrain stability at higher RPMs.
Supports more aggressive camshaft profiles.

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Product Details

Ferrea is a well-known name in high-performance engine components, and they've built a reputation for making parts that can handle serious stress. This single valve spring kit, part number KT4021, is designed for the 2012-2015 Scion FR-S and Subaru BRZ. If you're looking to upgrade your engine's valvetrain for more aggressive driving or to support other performance modifications, this kit is a solid choice.

This kit includes single valve springs, which are a key component in managing how your valves open and close. When you start pushing an engine harder, especially with higher RPMs or more aggressive camshafts, the stock valve springs might not be able to keep up. They can become unstable, leading to valve float, which is when the valve doesn't close properly. This can cause a loss of power and, in severe cases, serious engine damage. Ferrea's springs are made to provide the necessary seat pressure and open pressure to keep your valvetrain stable under these demanding conditions.

When you're rebuilding the top end of your engine for performance, the valve springs are a critical piece of the puzzle. They need to work in harmony with your camshafts and retainers to ensure precise timing and prevent interference between the valves and pistons. This kit is intended to be a direct replacement for the factory springs, simplifying the installation process for mechanics familiar with engine work. Make sure to consult your vehicle's service manual or a professional mechanic for the correct installation procedures, as working on valvetrain components requires precision.