What is the advantage of dual valve springs?

Dual valve springs offer increased seat and open pressures compared to single springs. This design helps prevent valve float, especially at higher engine speeds or when using more aggressive camshafts, ensuring reliable valve operation.

What material are these valve springs made from?

These valve springs are constructed from a special alloy chosen by Ferrea for its strength and durability. This material is selected to withstand the high heat and stress encountered in performance engine applications.

Are these springs suitable for a stock STI engine?

While these springs are designed for modified engines, they can be used in a stock STI if you are rebuilding the top end. However, their primary benefit is realized when paired with upgraded camshafts or other performance modifications that increase valve spring demand.

Ferrea Dual Special Alloy Valve Spring Set Subaru STI S10097

Name: Ferrea Subaru STI Dual Special Alloy Valve Spring - Set of 16
Brand: Ferrea
SKU: ferrea-ferrea-subaru-sti-dual-special-alloy-valve-spring-set-of-16-t14-419109
Price: 552.14 USD
Availability: BackOrder

Ferrea Subaru STI Dual Special Alloy Valve Spring - Set of 16

$552.14

On Backorder

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

Ferrea Dual Special Alloy Valve Spring Set for Subaru STI.

Key Features

Set of 16 dual special alloy valve springs for Subaru STI.
Constructed from a special alloy for improved strength and durability.
Dual spring design provides increased seat and open pressures.
Helps prevent valve float at higher RPMs and with aggressive camshafts.
Designed for high-performance engine builds and modifications.

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Product Details

If you're rebuilding the top end of your Subaru STI's engine, especially for high-performance applications, you'll want to pay close attention to your valve springs. These Ferrea Dual Special Alloy Valve Springs are designed to handle the increased demands of modified engines. They are built to keep your valves closing reliably, even at higher RPMs and with more aggressive camshaft profiles.

Ferrea uses a special alloy for these springs, which is known for its strength and durability under extreme heat and stress. This material choice helps prevent spring fatigue and ensures consistent valve control. The dual spring design offers increased seat pressure and open pressure compared to stock, which is crucial for preventing valve float when you're pushing your engine hard. This set includes 16 springs, enough for a complete engine rebuild.

When installing these, it's important to ensure your valve guides and seals are in good condition, as they work in conjunction with the springs. Proper installation and attention to detail will ensure these springs perform as intended, keeping your STI's engine running strong.