Engines and Components› Camshafts and Valvetrain

Ferrea Racing

Ferrea 2015 Ford Ecoboost 2.3L Single Spring Kit

$838.66

SKU: F00K KT4008

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

Ferrea valve springs control dominant harmonics, provide stability, and reduce valvetrain component wear. Developed from high-strength chrome silicon steel alloys, they are heat-treated and stress-relieved to increase spring life. They offer stability for high lift, high RPM racing engines and minimize load loss for aggressive valvetrain combinations.
Show original supplier description

Part #: KT4008

Vehicle Symptoms
  • valve float at high RPM
  • loss of power above 6000 rpm
  • ticking noise from cylinder head
  • misfire under hard acceleration
  • engine stumbles at high RPM
Diagnostic Codes
  • P0300 – Random or multiple cylinder misfire Det
  • P0301 – Cylinder 1 misfire Det
  • P0302 – Cylinder 2 misfire Det
  • P0303 – Cylinder 3 misfire Det
  • P0304 – Cylinder 4 misfire Det
  • P0305 – Cylinder 5 misfire Det
  • P0306 – Cylinder 6 misfire Det
  • P0307 – Cylinder 7 misfire Det
  • P0308 – Cylinder 8 misfire Det
Relevant Conversations
  • valve float at high rpm EcoBoost 2.3L
  • P0300 random misfire after valve spring install
  • Ferrea KT4008 single valve spring kit review
  • Ferrea vs Supertech valve springs 2.3L EcoBoost
  • how to install valve springs without removing cylinder head
  • EcoBoost 2.3L valve spring upgrade for high boost
  • symptoms of broken valve spring Ford EcoBoost
  • best valvetrain upgrades for 2.3L EcoBoost
  • valve spring retainers and locks for Ferrea KT4008
  • P0301 cylinder 1 misfire high rpm valve springs

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandFerrea Racing
Part NumberF00K KT4008

Videos

Ferrea - Tech Tuesday / Valve Spring & Retainer

Ferrea - Tech Tuesday / Valve Spring & Retainer

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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