AEM 23-831BK Tru-Time Adjustable Cam Gear for 2003-2006 Mitsubishi Evo 4G6

Vehicle Fitment

• 2003-2005 Mitsubishi Lancer Evolution VIII (2.0L 4G63T turbo)
• 2005-2006 Mitsubishi Lancer Evolution IX (2.0L 4G63T turbo)

Features

• Tru-Time adjustable camshaft gear for fine-tuning cam timing
• Advance or retard cam profile in precise 1° increments via laser-etched timing marks
• Grade-8 hex cam gear bolts with integral washers for secure, repeatable clamping
• CNC-machined from 6061-T6 billet aluminum for strength and durability
• Hard-anodized belt contact surface resists premature wear
• Ideal for milled heads, forced induction, high-compression or competition engines
• Enables increased horsepower and torque without swapping cams
• Sold individually - use one per camshaft or two for full dual-cam adjustment

Specifications

• Part number: AEM 23-831BK
• Application: Adjustable camshaft gear (5-bolt pattern)
• Engine: Mitsubishi 2.0 L 4G63T turbo (Evo VIII/IX)
• Fitment years: 2003-2006 Mitsubishi Lancer Evolution VIII/IX
• Material: 6061-T6 billet aluminum, black hard-anodized finish
• Adjustment increments: 1° etched timing marks
• Sold: individually (one gear each)
• Legal status: legal for sale/use on emissions-controlled & non-controlled vehicles (does not affect emissions)
• Warranty: Manufacturer's 1-year limited warranty

Included Components

• 1x AEM Tru-Time adjustable camshaft gear (23-831BK)
• 6x Grade-8 hex cam gear bolts with integral washer flanges
• Installation instructions and recommended settings

Product Description

The AEM 23-831BK Tru-Time Adjustable Cam Gear is a high-precision engine timing component designed specifically for **2003-2006 Mitsubishi Lancer Evolution VIII and IX models** equipped with the **2.0 L 4G63T turbocharged engine**. This adjustable gear replaces the stock cam gear, allowing tuners to advance or retard the camshaft timing in **exact 1-degree increments** using true laser-etched timing marks - a significant advantage when optimizing performance in engines with milled heads, aftermarket cams, high compression, or forced induction setups.

CNC-machined from rugged **6061-T6 billet aluminum** with a hard-anodized belt surface for wear resistance, the 23-831BK gear is built for durability and repeated adjustment. The kit includes Grade-8 hex bolts with integral washer flanges for secure mounting and repeatable operation. Sold individually, this cam gear fits the 5-bolt pattern common to Mitsubishi Lancer Evolution 8 and 9 4G63T engines - note that dual-cam applications may require two gears for full intake and exhaust adjustment. Because this part does not affect emissions control hardware, it is generally legal for use on emissions-controlled road vehicles.