Keep exhaust valve timing phasing correctly with the Standard Ignition Engine Variable Valve Timing (VVT) Sprocket VVT521, a direct-fit replacement for a wide range of GM applications including the 2013-2018 Cadillac ATS, 2010-2015 Chevrolet Camaro, 2009-2022 Chevrolet Traverse and 2007-2017 GMC Acadia — see the Buyer's Guide tab for the full list of vehicles.
This is the exhaust-side VVT sprocket (cam phaser). It mounts to the exhaust camshaft and, using engine oil directed by the VVT control solenoid, varies the timing of the exhaust camshaft relative to the crankshaft across the engine's operating range.
- Exhaust position: cataloged for the exhaust camshaft on the listed applications.
- Oil-actuated phasing: adjusts cam-to-crank timing using pressurized engine oil routed through the VVT solenoid.
- Direct-fit replacement: designed to install on the listed GM applications as a service replacement for a worn or failed original.
Signs the exhaust VVT sprocket may need replacing can include a rattle on cold start, rough idle, or VVT-related trouble codes. Diagnose the cause first — the VVT solenoid, oil supply, or other timing parts can produce the same symptoms — and if the sprocket is at fault, VVT521 replaces it. Manufacturer part number VVT521.
Frequently Asked Questions
Will this fit my vehicle?
It's a direct-fit exhaust VVT sprocket for many GM models such as the Cadillac ATS, Chevrolet Camaro and Traverse, and GMC Acadia. Check the Buyer's Guide tab for your exact year and engine.
Is this the intake or exhaust sprocket?
It is cataloged for the exhaust camshaft position on the listed applications.
What does a VVT sprocket do?
It's a cam phaser that uses engine oil directed by the VVT control solenoid to vary the exhaust camshaft's timing relative to the crankshaft as operating conditions change.
What are the signs this part may need replacing?
Possible signs include a startup rattle, rough idle, or VVT-related trouble codes. Diagnose the cause first, since the solenoid, oil flow, or other parts can produce the same symptoms.
How is it installed?
This is a timing component that requires setting camshaft timing. Follow the vehicle service procedure for the correct fasteners, torque, and whether any may be reused.
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