Supertech Dual Valve Spring and Titanium Retainer Kit for Mazda MZR / Duratec 2.0L 2.3L 2.5L Engines

Dual Valve Spring and Titanium Retainer Kit for Mazda MZR / Duratec 2.0L 2.3L 2.5L EnginesSet of 16 Dual Valve Springs, 16 Titanium Retainers and 16 Spring SeatsSPRK-TS/DUR-D1Type: Dual SpringOuter Spring: OD 27.50mm - ID 20mmInner Spring: OD 20mm - ID 15.20mmPress.Seat: 83lbs @ 35.0mmMax Lift: 14.30mmCoil Bind: 20.70mmRate: 12.10mmRetainer: RET-TS5.5/T1Spring: SPR-TS/DUR-D1Seat: SEAT-DUR1 + Reuse OEM Seat SPRK-TS/DUR-D2Type: Dual SpringOuter Spring: OD 27.50mm - ID 20mmInner Spring: OD 20mm - ID 15.20mmPress.Seat: 70lbs @ 36.2mmMax Lift: 15.50mmCoil Bind: 20.70mmRate: 12.10mmRetainer: RET-TS5.5/T1Spring: SPR-TS/DUR-D2Seat: SEAT-DUR2 + Reuse OEM SeatOur valve springs are computer designed to ensure that wire stress levels do not overpass the limits of stress defined in the diagrams of fatigue. We also utilize computer software that allows us to ensure that the harmonics are under control. All Supertech valve springs are made with premium super clean Chrome Silicon Vanadium Steel alloy