Advancing Valve Timing

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Advancing
Begins Intake Event Sooner
Open Intake Valve Sooner
Builds More Low-End Torque B
Decrease Piston-Intake Valve Clearance
Increase Piston-Exhaust Valve Clearance

Retarding
Delays Intake Closing Event
Keeps Intake Valve Open Later
Builds More High-RPM Power
Increase Piston-Intake Valve Clearance
Decrease Piston-Exhaust Valve Clearance