Massive Speed Valve Spring and Titanium Retainer Kit - Miata 2.5 Swap (Duratec / MZR)

High Lift Valvetrain kit includes high rate springs and lightweight titanium retainers for maximum performance. A must for high boost, higher lift cams and high RPM use.

Duratec Set - Compatible with 2.0 2.3 2.5 Ford Duratec / Mazda MZR / Ford Ecoboost Engines Found in Ford Focus Escape Ranger Mustang Bronco Fusion Transit Connect Cmax etc ete - Mazda 3 5 6 MS3 6 Mazdaspeed CX-7 

Chromium Silicon Spring material improves fatigue life

6AL4V Titanium retainers turned in house.  7 Degree lock taper

Much lighter than kits that use steel / oem retainer

Duratec Specs:  Spring Pressure: Seat: 1.400" @ 66 lbs / Nose: 1.000 " @161 lbs / Coil Bind: 0.860"

Duratec / MZR / Ecoboost I4 2.0 2.3 2. 5

Zetec 2.0  (not for SVT - see our Cat cams springs/retainers for that application)