COMP Cams Dual Valve Springs for street/strip applications are manufactured from Super Clean wire and subject to extensive quality control testing to deliver a valve spring assembly with superior strength, durability and valve train stability, no matter the application. The dual spring design creates a stronger valve spring that can easily handle the increased lift found in extreme stress applications. COMP Cams Dual Valve Springs exceed the expectations of today's engine builders and racers. PartNumber : cca26925-12 Description : Street/Strip Dual Valve Spring; 12 Pieces Title : 26925-12 Dual Valve Springs, .660" Lift , 1.320"OD Inside Diameter(in) : 0.68 Open Pressure(lbs) : 405 Position : N/A Spring Type : Double Installed Height(in) : 1.810 Installed Pressure(lbs) : 141 Open Height(in) : 1.15 Spring Rate(lbs/in) : 400 Outside Diameter(in) : 1.320 Camshaft Type : Mechanical Coil Bind Height(in) : 1.1 Engine Components::Valve Springs, Retainers