Supertech Dual Valve Springs for 1990-1993 Mazda Miata 1.6L B6 Engines

Dual Valve Springs for 1990-1993 Mazda Miata 1.6L B6 EnginesSet of 16 Dual Valve SpringsSPR- MM16D2Outer Spring: OD 27.50mm - ID 20.00mmInner Spring: OD 20.00mm - ID 15.20mmType: Dual SpringPress.Seat: 74lbs @ 35mmMax Lift: 14.30mmCoil Bind: 20.70mmRate: 12.10mmNote: These Dual Valve Springs require the use of Supertech Retainer Part # RET-TS60/MA2 & SEAT-TS/MA18E and OEM seat - (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 provides the added benefit of better structural memory for all of our springs, giving your performance racing engine a serious competitive advantage.