In 2007-08, the actuator has 62-degree rotation. The one one the right has no actuator, so it is from an engine without VVT. The one on the left has the camshaft phasing actuator, indicating that it is from an engine with VVT. They only have a three-pin connector for the camshaft sensor. They also have a five-pin connector for the VVT and camshaft sensor.Įngines without VVT will not have the actuator. (More on that in a second.) How You Can Tell Whether Your LS has VVTĮngines with VVT will have a camshaft phaser actuator on the timing cover. If you want high performance from a bigger cam, you will need to delete the VVT system. If you want to upgrade your camshaft and keep the VVT system, you will need a Camshaft Phaser Limiter. The high spring pressure required for performance cams can overpower the actuator.Your choices for valve lift and duration are limited.Piston-to-valve clearance can be a problem.VVT becomes an issue when swapping a cam: It can also retard the valve timing for more top-end power. It can advance valve timing for a smooth idle and low-end torque. That rotation is used to advance or retard the camshaft as needed. The actuator rotates one way or the other, depending on the oil flow. The valve sends oil into the phaser control chambers. The solenoid controls oil flow through a special control valve in the camshaft bolt. The computer sends a signal to a solenoid on the timing cover. It then uses that VVT data to determine the best valve timing for the current conditions. It also monitors valve timing through the camshaft position senso r. ( Summit Racing’s Paul Spurlock and Brian Nutter contributed to this article.) How Does VVT Work?
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