The 2007 & newer GM L92 engines utilize Variable Valve Timing (VVT) controlled via cam phasers. Cam phasers are computer controlled cam gears that automatically optimize camshaft timing based on the current engine rpm. While this technology provides tremendous efficiency benefits, it presents a challenge when designing performance cams due to the wide range of valve timing movement and constantly changing piston to valve clearance. As a result the COMP Cams® engineers have developed a Cam Phaser Limiter Kit that restricts the range of cam timing movement from 50° to 20°. This modification provides the necessary valve clearance for serious performance camshafts with tighter lobe separations – while still utilizing the benefits of the VVT technology. The resulting upper-rpm gains are some of the largest we’ve ever seen from a camshaft swap without sacrificing any bottom-end or mid-range performance.