Multiple U.S. Warehouse LocationsBroken ApexFree shipping on qualified orders over $100*
The Supertech dual valve spring kit for Ford Duratec and Mazda MZR 2.0L/2.3L/2.5L engines supplies matched valve springs intended to support reliable valve control and spring stability under higher loads. It’s a compact upgrade choice for builders seeking improved valve train consistency without altering other components. The kit targets natural valve control improvements for those specific Duratec/MZR applications.
Supertech Ford Duratec/Mazda MZR 2.0L/2.3L/2.5L Dual Valve Spring Kit
