Supertech Valve Spring and Retainer Kit DUAL SPRING 70LB Ford/Mazda Duratec 2.0L/2.3L inc. Mazdaspeed 3 2007-2013 / Mazdaspeed 6 2006-2007

Our dual valve springs are designed and manufactured to reduce valvetrain harmonics, increase durability, and provide an increase in performance for your high performance racing engine. All of our dual valve springs are manufactured using superclean chrome silicon vanadium alloy and then heat treated, stress relieved and shoot peened to help improve the fatigue life of the spring.