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Comp Cams High Perf GM LS1 Dual Valve Spring Kit Invidia With dyno-proven gains of 13–19GM LS1 Dual Valve Spring Kit The valve spring creation process is far more involved than most people realize. Selecting the right metal stock and creating the best design is not done by chance. COMP Cams has developed a process that creates the highest quality Race Valve Spring available. The result is a product that meets and exceeds the expectations of today's engine builders and racers. Vehicle Fitments: Year Make Model Submodel 2004 2006 Cadillac