| The COMP Cams® Cam Phaser Limiter Kits for GM Gen IV VVT (Variable Valve Timing) engines restrict the range of cam timing movement to only 20 degrees, thus providing the necessary valve clearance for serious performance cams with tighter lobe separations – all while still utilizing the benefits of VVT technology. Combining this performance modification with more aggressive cam profiles has resulted in some of the largest upper-rpm gains we’ve ever seem from such a simple valve train adjustment without sacrificing any bottom end or mid-range performance.
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