Supertech valve springs are computer designed to ensure smooth harmonics under high RPM and load. The stress levels are kept under control and fatigue is reduced for long durability under extreme conditions.These springs are made of premium Super clean Chrome Silicon Vanadium steel alloy, which is a tough alloy that was designed for higher performance and durability at high RPM and memory retention. Supertech valve springs are made with premium Super clean Chrome Silicon Vanadium Steel alloy for higher performance & durability at high RPM & 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 are well under control. The Retainers are manufactured with high quality military certified Titanium alloy, CNC machined fir a tight fit that will ensure durability. The item "Supertech 93lb Dual Valve Springs & Titanium Retainers FOR Prelude H22A H22A4" is in sale since Monday, January 4, 2021. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Block Parts". The seller is "streetrays" and is located in Austin, Texas. This item can be shipped to United States.