Dual Valve Springs from COMP Cams 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 what 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 : cca26921-KIT Description : Pro-PAC Valve Spring Kit Title : 26921-Kit Dual Valve Spring Kit, High PE RF GM LS1 Position : N/A Coil Bind Height(in) : 1.04 Spring Rate(lbs/in) : 408 Camshaft Type : OEM Inside Diameter(in) : 0.655 Installed Pressure(lbs) : 135 Outside Diameter(in) : 1.3 Spring Type : Double Installed Height(in) : 1.77 Open Pressure(lbs) : 400 Open Height(in) : 1.2 2004-2005 Cadillac CTS V V8.-cc Engine Components::Valve Springs, Retainers 2006 Cadillac CTS V V8.5967cc Engine Components::Valve Springs, Retainers 1998-2002 Chevrolet Camaro Z28 V8.-cc Engine Components::Valve Springs, Retainers 1998-2002 Chevrolet Camaro Z28 SS V8.-cc Engine Components::Valve Springs, Retainers 2003 Chevrolet Corvette 50th Anniversary Edition V8.-cc Engine Components::Valve Springs, Retainers 2003 Chevrolet Corvette 50th Anniversary Edition Pace Car V8.-cc Engine Components::Valve Springs, Retainers 1997-2005 Chevrolet Corvette Base V8.-cc Engine Components::Valve Springs, Retainers 2006 Chevrolet Corvette Base V8.5967cc Engine Components::Valve Springs, Retainers 1998 Chevrolet Corvette Indianapolis 500 Pace Car V8.-cc Engine Components::Valve Springs, Retainers 2001-2004 Chevrolet Corvette Z06 V8.-cc Engine Components::Valve Springs, Retainers 2006 Chevrolet Impala SS V8.5328cc Engine Components::Valve Springs, Retainers 2006 Chevrolet Monte Carlo SS V8.5328cc Engine Components::Valve Springs, Retainers 2005-2006 Chevrolet SSR Base V8.-cc Engine Components::Valve Springs, Retainers 2005-2006 Chevrolet SSR Base V8.5967cc Engine Components::Valve Springs, Retainers 2006 Chevrolet Trailblazer SS V8.5967cc Engine Components::Valve Springs, Retainers 1998-2002 Pontiac Firebird Formula V8.-cc Engine Components::Valve Springs, Retainers 1998-2002 Pontiac Firebird Trans Am V8.-cc Engine Components::Valve Springs, Retainers 2005-2006 Pontiac Grand Prix GXP V8.5328cc Engine Components::Valve Springs, Retainers 2004 Pontiac GTO Base V8.-cc Engine Components::Valve Springs, Retainers 2005-2006 Pontiac GTO Base V8.5967cc Engine Components::Valve Springs, Retainers