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RCM Alloy / Steel Vernier Cam Pulley Set Impreza WRX/STI 2001-2007 (V7-V9)
New Product Great Quality

Manufacturer: Roger Clark Motorsport
Roger Clark Motorsport

Price incl. 23% VAT 682,65 EUR Price excl. 23% VAT 555,00 EUR

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RCM Adjustable Vernier Pulleys are a valuable asset to any high performance engine allowing adjustment for exact valve timing to ensure the combustion process is as efficient as possible.

Given the important role of the camshaft pulleys, strength, durability, accuracy and quality are all important factors when producing such components.   

The outer toothed wheel of our vernier pulleys is manufactured from 7075 T6 Alloy which is a "Class 1 Type A Approved" material, the certification required for use in Formula 1 and the Aerospace industry. 7075 Alloy is thoroughly evaluated for corrosion resistance, and ultrasonically crack tested to ensure each batch of material is 100% perfect before use. After being produced using the latest 5 axis CNC machines the cam wheels are then finished with U.S military specification chromic acid anodising to ensure a durable and attractive finish. 

The centre disc of the pulley is manufactured from EN8 medium carbon steel, the same material typically used to produce gears, axels and shafts where strength is priority. As with the outer wheel the inner disc is then coated to prevent corrosion, increase hardness and ensure a perfect long lasting finish.

Finally each individual component is throughly inspected before being assembled into the finished gear wheels.



• Outer Wheel manufactured from 7075 T6 Alloy.
• Inner Disc manufactured from
EN8 medium carbon steel.
• Military Specification Chromic Anodised Finish on all outer toothed wheels.
• Combined weight of 2.894 Kg
• Included in this kit are only the Exhaust pulleys as the inlet pulleys are VVT and cannot be replaced.


• Allows fine adjustment of exhaust valve timing to perfect the combustion process.
• Greatly improved strength over the OE exhaust pulleys.
• Decreased drag on the engine thanks to the lightweight properties of the pulleys.
• Easy Installation.
• Complete with timing marks to aid adjustment.


Suitable for the following vehicles:
• All Impreza STI models with VVT on the inlet registered between 01/2000 - 2007 (also known as V7 through to V9). 


Box Dimensions 30x15x7 cm
Dimensional Weight 0.52 kg
Actual Weight 1.5 kg



Product Features

Price excl. 23% VAT 555,00 EUR

VAT 23%

Price incl. 23% VAT 682,65 EUR

By weight 1,500 kg

Manufacturer's Website www.rogerclarkmotorsport.co.uk/