Livernois MotorsportsS 3 Valve Cam Phaser Lockout- Pair 4.6L/5.4L

These cam phaser limiters are designed to allow the use of aftermarket springs and camshafts while still retaining the stock phaser. The limiters are two piece anodized billet aluminum and designed to fit within the stock phaser. These limiters are designed to limit the total travel of the cam phaser. They eliminate the durability issues associated with the phasers and allow the use of larger aftermarket camshafts and springs. The use of aftermarket valve springs with increased spring pressure, as well as aftermarket camshaft profiles do not allow the factory Ford cam phaser to function properly and may even cause it to fail. The increased spring pressures and more aggressive camshaft ramp rates cause the phaser to behave erratically. The factory phaser cannot control these added pressures, and in the majority of cases the phaser will emit a knocking noise as the phaser struggles to control the camshaft position. This can also cause erratic idle, poor mileage and power loss..