Valve springs are made with premium Superclean Chrome Silicon Vanadium Steel alloy for higher performance & durability at high rpms and better memory.Computer designed to ensure that wire stress levels do not overpass the limits of stress defined in the diagrams of fatigue for long durability under extreme conditions.Computer software also allows us to make sure that the harmonics arewell under control.The Retainers are manufactured with high quality military certified Titanium alloy, CNC machined for a tight fit that will ensure a long durability.VALVE SPRINGS Outer Spring Inner Spring Pressure Max Lift Coil Bind Rate Titanium RetainerPart Number O.D. (MM) I.D. (MM) O.D. (MM) I.D. (MM) Seat Open mm mm lbs/mm Part NumberSPR-TS1015 27.50mm 20.00mm 20.00m 15.20mm [email protected] [email protected]
12.90mm 20.70mm 12.10mm RET-TSï¿½??SPR-2081-SP 27.50mm 20.00mm [email protected] [email protected]
12.90mm 20.70mm 9.60mm RET-NVï¿½??SPR-TS1012 27.50mm 20.00mm 20.00mm 15.20mm [email protected] [email protected]
12.90mm 20.70mm 12.10 RET-TSï¿½??SPR-TS1009 drag 27.50mm 20.00mm 20.00 14.20mm [email protected] [email protected]
12.10mm 20.7/19.5 14.50mm RET-TSï¿½??Part # SPRK-TS1015These springs/retainers are highly recommended for Supra owners with stock valves. They are not overly stiff to overpower the OEM valve like the Ferrea springs are and they are much stronger than the Brian Crower single springs kit.