TSP 6.2L LT1/LT4/L86 VVT-SV "Stock Vert" CamshaftCam Specs: 223 227, . 635" . 635", 116 LSA The gen 5 LT1 engine utilizes Variable Valve Timing (VVT) controlled via a cam phaser. A cam phaser is a computer controlled cam gear that automatically optimizes 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