10 3V Modular Engine Heads Cam Intake Install
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Those large assemblies on the cam gears are the camshaft phasers. Ford uses them to advance or retard cam timing to improve low-end torque and driveability. But they aren't helpful in full-bore performance applications, and severely limit how much cam you can run. As such, Pro-Dyno will lock out the phasers to allow a more aggressive cam profile. View Related Article
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