Crower Performance Spring and Retainer Kit

Engineered component kit includes high rate springs and lightweight titanium retainers for maximum performance. A must for higher lift cams and high RPM use.   Zetec Specs:  Spring Pressure: Seat: 1.400" @ 66 lbs / Nose: 0.950" @174 lbs / Coil Bind: 0.860" Some castings may require slight opening up of spring pocket area for clearance. Contact Massive for service and/or tool.   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 Zetec 2.0 Crower 84169 (not for SVT - see our Cat cams springs/retainers for that application)