Supertech Dual Valve Spring and Steel Retainer Kit for 2006-2011 Honda Civic Si K20Z3 Engines

Dual Valve Spring and Steel Retainer Kit for 2006-2011 Honda Civic Si K20Z3 EnginesSet of 16 Dual Valve Springs, 16 Steel Retainers and 16 Seats SPRK-H1019D-STOuter Spring: OD 30.00mm - ID 21.80mmInner Spring: OD 21.30mm - ID 15.60mmType: Dual SpringPress.Seat: 97lbs @ 40.4mmMax Lift: 17.70mmCoil Bind: 22.70mmRate: 14.80mmRetainer: RET-HBK-STSpring: SPR-H1019DSeat: SEAT-H1020DSSPRK-H1021D-STOuter Spring: OD 30.00mm - ID 21.80mmInner Spring: OD 21.30mm - ID 15.50mmType: Dual SpringPress.Seat: 95lbs @ 40.4mmMax Lift: 17.70mmCoil Bind: 22.70mmRate: 13.20mmRetainer: RET-HBK-STSpring: SPR-H1021DSeat: SEAT-H1020DSSPRK-H1022D-STOuter Spring: OD 30.00mm - ID 21.80mmInner Spring: OD 21.00mm - ID 15.50mmType: Dual SpringPress.Seat: 80lbs @ 40.4mmMax Lift: 18.30mmCoil Bind: 22.00mmRate: 11.20mmRetainer: RET-HBK-STSpring: SPR-H1022DSeat: SEAT-H1020DSOur 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