COMP Cams Cam Phaser Kit GM L-94/L-99Recently, General Motors developed the new L94 L99 engines, which utilize Variable Valve Timing (VVT). This Technology is regulated by the use of Cam phasers, which are computer controlled Cam Gears that optimize Camshaft timing based on current engine rpm. Engine oil is pressure fed to the Cam phasers through a Series of passageways in the cylinder heads and Cam while the engine computers control solenoids that adjust this oil flow into and out of