Dorman 916-638 Engine Variable Valve Timing (VVT) Sprocket - Exhaust or Intake

Engine VVT Sprocket Replacement

Restore proper variable valve timing operation with this Dorman engine VVT sprocket, part number 916-638. Built from steel with a silver finish, it is a standard replacement designed to install and perform like the original on select Chevrolet, GMC, Buick, and Chevrolet small-displacement engines.

For drivers searching for a Chevrolet Malibu exhaust VVT sprocket replacement or a GMC Terrain exhaust cam phaser-style sprocket, this part provides a direct-fit service solution for the listed applications.

Key Features

• Steel construction for durable engine-valve-train service
• Silver finish
• Standard replacement design for OE-style fit and function
• Bolt-on attachment type
• Outside diameter: 4.20 in; overall height: 1.28 in
• Inside diameter: 0.52 in
• Wiring harness not included; connector quantity: 0

Detailed Description

The Dorman 916-638 variable valve timing sprocket is engineered to replace a worn factory unit and help restore engine performance and clean running. Variable valve timing depends on accurate sprocket operation to maintain proper cam timing, and wear in this component can affect drivability, idle quality, and efficiency. This steel, bolt-on sprocket is built as a standard replacement for the original part on select Chevrolet Malibu, Chevrolet Equinox, GMC Terrain, Buick Encore, Chevrolet Spark, Chevrolet Trax, and Chevrolet Cruze applications.

This part cross-references Standard Ignition VVT632 for the same application.

What It Helps Address

• Rough idle caused by worn VVT sprocket operation
• Loss of engine response from incorrect cam timing
• Check engine concerns related to variable valve timing performance
• Reduced smoothness during acceleration on affected engines
• Noise or inconsistency from a worn factory sprocket

Installation Notes and Tips

• Verify engine position and application before installation.
• Use the listed fitment to match intake or exhaust location exactly.
• Inspect related timing components during service for wear or damage.
• Follow factory service procedures for cam timing alignment and torque specifications.
• Confirm the replacement matches the original bolt-on configuration.

Quality Assurance

Dorman designs this VVT sprocket as a standard replacement part intended to match original fit and performance requirements for the listed vehicles. It is built to restore proper operation in the engine valve train on supported Chevrolet, GMC, and Buick applications.