Comp Cams SPR Cams for GM Gen IV VVT Engines

New camshaft kits from COMP Cams® modifies L92 cam phasers provide significant gains in upper-rpm power without hurting bottom-end & mid-range performance.  Rather than find ways around the recent advances in GM engine technology, engineers at COMP Cams® have found a way to work with the innovation to produce a powerful line of cams for the newer L92 engines. This new series of XFI™ SPR (Valve Springs & Phaser Modifications Required) Camshafts features four unique cam grinds that each provide substantial gains in both torque and horsepower.

The 2007 and newer GM L92 engines utilize Variable Valve Timing (VVT) technology, which changes the timing of the valves while the engine is in operation. VVT is controlled via cam phasers, which 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 camshafts. This is due to the wide range of valve timing movement which causes piston-to-valve clearance.

As a result, the COMP Cams® engineers have developed a Cam Phaser Limiter Kit (Part #5456) that restricts the range of cam timing movement from 50 degrees to 20 degrees. While still utilizing the efficiency benefits of the VVT technology, this modification provides the necessary valve clearance for larger, more serious performance camshafts with tighter lobe separations. The resulting increases in upper-rpm horsepower (70+ hp) from a simple camshaft swap are some of the largest ever seen by valve train experts at COMP Cams®, and these gains occur without any sacrifice to bottom-end or mid-range performance.

These new performance camshafts are designed for use with the COMP Cams® Phaser Limiter Kit (63-5456) and Beehive™ Valve Springs (63-26918-16).