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When looking for maximum reliability, nothing beats a dual valve spring. Our New Part No. ISK4905 is a drop-In installation with no machining required. Also available is the larger diameter ISK6105-SP for engines that need a higher seat pressure. Manufactured from a special Hi-Tensile Chrome Silicon Alloy, these springs yield maximum reliability in LS-1 Hydraulic Roller Cam Applications and will handle up to .650" Valve Lift. When converting to dual springs, matching steel retainers, spring locaters and valve seals are required.