Supertech Dual Valve Springs for Opel Calibra C20XE & C20LET 16v 2.0L Engines

Supertech Dual Valve Springs for Opel Calibra C20XE & C20LET 16v 2.0L EnginesSet of 16 Dual Valve SpringsSPR-H1002-C20Type: Dual SpringOuter Spring: OD 29.05mm - ID 21.85mmInner Spring: OD 20.50mm - ID 15.50mmPress.Seat: 70lbs @ 34mmMax Lift: 14.50mmCoil Bind: 19.50mmRate: 10.00mmSPR-H1001D-C20Type: Dual SpringOuter Spring: OD 29.35mm - ID 21.85mmInner Spring: OD 20.50mm - ID 15.50mmPress.Seat: 80lbs @ 34mmMax Lift: 14.00mmCoil Bind: 20.00mm Rate: 11.00mmNote: These Dual Valve Springs require the use of Supertech Retainer Part # RET-H70/T1 - (Sold Separately)Our 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 for higher performance & durability at high rpms. Using high quality steel alloy also