COMP Cams Engine Variable Timing Adjuster Plug

COMP Cams VVT Adjuster Plugs: Precision Cam Phaser Control for Performance Builds

When you're installing an aggressive camshaft into a modern engine equipped with Variable Valve Timing (VVT), the factory cam phaser system can become a liability. COMP Cams has engineered a focused lineup of Engine Variable Timing Adjuster Plugs — commonly known as cam phaser lockouts and limiters — purpose-built to give performance engine builders precise control over camshaft timing.

Modern VVT systems use computer-controlled cam phasers to automatically optimize camshaft timing based on RPM and load. While this works well with stock camshafts, installing a performance cam with a tighter lobe separation angle can create dangerous piston-to-valve clearance issues when the phaser moves freely. COMP Cams addresses this with two distinct approaches: full phaser lockouts that eliminate VVT movement entirely, and phaser limiters that restrict the range of cam timing movement to a safe, controlled degree.

Platform-Specific Solutions

The COMP Cams Cam Phaser Lockout Kit eliminates variable valve timing to make the installation of larger cams possible, preventing VVT from moving the camshaft installed centerline while increasing piston-to-valve clearance. This approach is ideal for dedicated race or high-horsepower street builds where maximum cam timing is set at installation and does not need to vary.

For builds where retaining some VVT benefit is desirable, COMP Cams offers phaser limiter kits. This valve train modification restricts the range of cam timing movement from 52° to 22°, providing the necessary valve clearance for more aggressive hydraulic roller camshafts with tighter lobe separations, all while still reaping the benefits of GM VVT technology.

The product lineup spans today's most popular performance platforms:

• GM Gen IV LS & Gen V LT: The cam phaser plug limits the movement of your variable timing camshaft to 22 degrees on '09+ Gen IV LS and '14+ LT1 applications. The 5465 phaser lockout is designed to accommodate only 62-degree movement range GM VVT's for '07–'08 L92 and Gen V LT1 engines.
• Chrysler HEMI: The phaser limiter kit for '08+ Chrysler 5.7–6.4L HEMI engines comes complete with the phaser limiter, limiter tool, and instructions for proper installation, and limits the range of cam movement to 14 degrees.
• Ford 5.0L Coyote: COMP Cams offers adjustable phaser limiters (part #5493) for 2011–2014 Ford 5.0L Coyote Modular 4-valve engines.
• Ford 7.3L Godzilla: An installation tool is included for easier fitment, as well as the special socket necessary to remove the factory camshaft phaser retaining bolt, for use on 2020-present Ford Super Duty applications.

Why Trust COMP Cams for Phaser Control?

For more than 35 years, the COMP Cams mission has never changed: to produce the highest-performing products possible, provide customers with superior service, and to lead the industry in technological development. Their cam phaser kits are engineered as a system, designed and tested alongside the COMP Cams XFI™ SPR cams and Beehive™ valve springs, resulting in some of the biggest gains in power and torque COMP has ever seen. Whether you need a complete lockout for a race-only build or a precision limiter that preserves everyday drivability, COMP Cams provides the platform coverage and engineering depth to back it up.