VTK-ECOTEC Kit Contains:4231-12 - Valve Springs (spring pressure 120lb @ 1.780" and 270 @ .500" lift)10707-12 - Retainers10701-12 - Valve Locks
VTK-ECOTEC-R Kit Contains:4919-12 - Valve Springs (spring pressure 150lb @ 1.780" and 310 @ .500" lift)10707-12 - Retainers10701-12 - Valve Locks

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