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The 2.3L Ecoboost in the 2016+ Ford Focus RS relies on friction washers to keep the motor in time. While this solution usually works fine for stock power levels, once you start going for higher torque and horsepower numbers the possibility of slipping time can become very real. If this happens there's a good chance you'll need to rebuild or even replace the entire motor.
To prevent your motor slipping time Massive starts with a brand new Ford chain drive gear and EDM cuts a proper keyway to allow the timing chain drive gear to be positively locked to the crank in the event the crank pulley bolt should come loose. This will prevent COSTLY damage to your engine! Use with Massive keyed crankshaft. Includes key.