What an Adjustable Cam Gear Does
An adjustable cam gear allows you to:
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Advance or retard cam timing
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Optimize powerband characteristics
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Improve spool response
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Tune for upgraded camshafts
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Refine dyno performance
Small timing changes can make measurable differences.
Application: Evolution EVO 4 – 9 – 4G63
Location: Intake or Exhaust side
Note: The listing is for 1 cam gear
TOMEI Adjustable Cam Gear / Cam Pulley
Type: Sliding
Inner Plate Material: Duralumin
Gear Material: Duralumin
Weight: 497g
Key Features
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CNC-machined lightweight aluminum
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Precision timing markings
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Multi-point adjustable slots
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Designed for 4G63 cam alignment
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Sold as single cam gear (1PC)
Translation: precision tuning capability.
Why Use Tomei?
Tomei is known for high-quality engine components built specifically for high-performance Japanese platforms. Their cam gears are widely used in serious Evo builds.
Super Lightweight Duralumin – Duralumin was chosen for its lightweight properties and extra strength and durability. Both the outer and inner part is made from Duralumin to ensure that the product is the strongest available on the market.
Precision and Perfection – The pulley and inner plate are made from billet aluminum. The pulley gear part has been designed and manufactured from precision methods to guarantee reliability with securing the drive from the timing belt.
Application Specific Design – The Intake and Exhaust cam pulley have been designed and manufactured individually so as when the pulley comes to the top it is easier to adjust the timing from TDC. (model specific)
Ultra Durable – The hard anodized surface coating greatly increases the durability of the pulley. The added strength will allow the pulley to guarantee reliability for drag racing cars that are running monster power engines that exceed 1,000 HP and used with engine speeds in excess of 10,000 RPM.
Performance Use & Showroom Finish – The Duralumin material with the hard anodized surface treatment gives it better operational reliability and will enhance the look of your engine bay for that showroom finish.
Simple Scales for Adjustments – A simple scale was designed to help aid tuners anywhere are able to setup the settings on the scale to aid with easy setup process.
Ideal Applications
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EVO 4–9 performance builds
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Upgraded camshaft setups
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Turbo upgrades requiring cam adjustment
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Track and drag applications
Pair with proper dyno tuning for best results.
Installation Notes
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Degree cams using proper tools
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Verify timing marks carefully
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Torque cam bolts to spec
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Always recheck after initial heat cycles
Because mis-timed cams are expensive.
Final Verdict
The Tomei Adjustable Cam Gear for EVO 4–9 (4G63) offers precise cam timing control for serious performance builds. Lightweight construction, accurate markings, and tuning flexibility make it a must-have for upgraded cam setups.
Because factory timing isn’t always optimal.
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