What is the spring rate of these Ferrea valve springs?

These Ferrea valve springs have a rate of 305 pounds per inch. This specification indicates how much force is required to compress the spring a certain distance, with a higher number generally meaning a stronger spring capable of higher RPM operation.

What is the benefit of dual valve springs?

Dual valve springs provide increased stability and control over the valves, especially at higher engine speeds. They help prevent valve float, where the valve doesn't close completely or quickly enough, which can lead to engine damage and power loss.

Are retainers included with this set of valve springs?

This product listing is for a set of 16 dual valve springs only. Retainers and other valvetrain components are typically sold separately and should be confirmed for compatibility with these springs.

Ferrea 4G63/4G63T Dual Valve Spring Set S10031

Name: Ferrea Mitsubishi 4G63/4G63T 305lbs Rate Inch Dual Valve Spring - Set of 16
Brand: Ferrea
SKU: ferrea-ferrea-mitsubishi-4g63-4g63t-305lbs-rate-inch-dual-valve-spring-set-of-16-t14-419039
Price: 552.14 USD
Availability: BackOrder

Ferrea Mitsubishi 4G63/4G63T 305lbs Rate Inch Dual 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 4G63/4G63T dual valve spring set, 305lbs rate. Verified fitment.

Key Features

This set includes 16 dual valve springs.
Designed for Mitsubishi 4G63 and 4G63T engines.
Features a 305 lbs/in rate for improved performance.
Dual spring design offers enhanced stability at high RPMs.

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Product Details

This set includes 16 dual valve springs from Ferrea, specifically designed for Mitsubishi 4G63 and 4G63T engines. These springs are rated at 305 pounds per inch, which is a significant upgrade over stock components, allowing your engine to handle higher RPMs and more aggressive camshaft profiles without valve float.

Ferrea is well-known for making strong valvetrain components, and these springs are no exception. They are built to withstand the increased stress and heat generated in performance-oriented 4G63 engines. When you're rebuilding the top end or looking to push your engine beyond its factory limits, a well-matched set of valve springs is crucial. These dual springs offer excellent stability at high RPMs, ensuring that your valves close reliably and consistently, which is key for maintaining engine power and preventing damage.

Installing these springs is typically part of a larger engine build, often paired with performance camshafts and upgraded retainers. It's important to ensure all components in your valvetrain are compatible and properly installed according to manufacturer specifications to achieve the best results and longevity. This set is designed to be a direct replacement for the factory springs, simplifying the installation process for those familiar with engine work.