Massive High Lift Performance Valve Spring and Retainer Kits

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.

MACM'17060 - Zetec set  - Compatible with 2.0 DOHC Zetec engine found in Ford Focus Escort ZX2 Contour Cougar Mystique Escpape Tribute MAriner 

Will NOT Fit Focus with SVT

MACM'170xx - 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

Zetec retainers are 1 gram lighter than OEM

Zetec Specs:  Spring Pressure: Seat: 1.400" / 66 lbs / Nose: 0.950" @174 lbs / Coil Bind: 0.860"

 Some Zetec castings may require slight opening up of spring pocket area for clearance. Contact Massive for service and/or tool.

Much lighter than kits that use steel / oem retainer such as Piper Kent Burton 

Great replacement for now discontinued Crane comp Crower Ferrea

MACM'17065 - 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 Crower 84170 replacement

Zetec 2.0 Crower 84169 Replacement  (not for SVT - see our Cat cams springs/retainers for that application)