Ferrea Dual Valve Spring Kit for 4G63 Evo 4-9 (KT4013)

Ferrea dual valve spring kit for the Evo 4/5/6/7/8/9 includes a full set of 16 dual springs, titanium retainers, seat locators and valve locks.

Vehicle Fitment:
1996-2006 Evolution IV V VI VII VIII IX

Includes:
(16) Dual Springs (S10084)
(16) Titanium Retainers (E11052)
(16) Seat Locators (SL1041)
(16) Valve Locks (32 pieces) (K10035)

More Info:
Ferrea valve springs are heat-treated and stress relieved, which dramatically increases the spring's life. These provide the stability needed for high lift, high rpm racing engines, while minimizing the load loss for today's aggressive valvetrain combinations.

Harmonics or high frequency fatigue is present in all racing engines and will usually destroy the valvetrain if not controlled. Properly designed valve springs will control the dominant harmonics, provide the needed stability, and reduce valvetrain component wear. Ferrea valve springs are developed from high strength alloys, including premium grade chrome silicon steel.