HKS 22004-AN002 Adjustable Exhaust Cam Gear for Nissan RB26DETT RB25 RB20 R32-

Vehicle Fitment

• 1989-1994 Nissan Skyline R32 - BNR32 GT-R (RB26DETT), ECR32 GTS-4 (RB25DE)
• 1993-1998 Nissan Skyline R33 - BCNR33 GT-R (RB26DETT), ECR33 GTS-T (RB25DET), ER33/ENR33 GTS (RB25DE)
• 1999-2002 Nissan Skyline R34 - BNR34 GT-R (RB26DETT), ER34 GT/GT-T (RB25DE/RB25DET), ENR34 (RB25DE)
• Nissan Stagea WGNC34 - RB25DE, RB25DET, RB26DETT (1996-2001)
• Nissan Laurel C34/C35 - RB25DE, RB25DET (1993-2002)
• Nissan Cedric/Gloria ENY33/ENY34 - RB25DET (1997-2004)
• Nissan Cefiro EA31/ECA31 - RB25DE (1992-1994)
• Nissan Leopard JENY33 - RB25DET (1997-1999)

Fitment Notes

• Exhaust camshaft side only - for the intake cam gear, see HKS 22004-AN001
• Fits all RB20DE(T), RB25DE(T), and RB26DETT engines equipped with a timing belt driven exhaust camshaft - covers the complete RB family cam gear interface
• Compatible with both OEM factory camshafts and HKS or other aftermarket performance camshafts - an adjustable cam gear is essential when running aftermarket cams to dial in correct valve timing for your specific tune
• Does NOT fit RB engines with timing chain configurations - this is a belt-drive cam pulley only
• Cam timing must be confirmed with a degree wheel after installation - HKS recommends professional dyno tuning to optimize the advance/retard setting for your engine specification
• Not legal for street use in California (not CARB-approved) - for competition and off-road use only

Features

• Adjustable exhaust cam gear (slide pulley) - allows precise valve timing advance or retard of ±20° in 2° increments to optimize engine output for specific RPM targets, camshaft profiles, turbo characteristics, and fuel/tune combinations
• Vernier scale with 2° interval marks - all index marks are laser-etched directly into the Duralumin face for permanent, easy-to-read reference during installation and adjustment
• Directional markers "A" (advance) and "R" (retard) laser-etched on cam gear face - eliminates guesswork during valve timing setup
• Manufactured from A2014 super-light Duralumin - 50% greater strength and 30% greater hardness compared to the previous version, while reducing rotational mass by approximately 10% versus prior HKS RB cam gears
• Nickel-plated gear teeth - surface hardness increased from Hv 350 to Hv 500 (43% improvement) compared to the prior version; resists wear from high-performance timing belts and any debris that may enter the belt drive
• Hard anodized purple finish with laser-engraved HKS logo - provides corrosion resistance and the unmistakable HKS aesthetic
• Slide cam pulley design allows fine, stepless adjustment within the ±20° window once the mounting bolts are loosened - no special tools required for adjustment
• Reduced rotational mass decreases parasitic drag on the camshaft drive system, contributing marginally to engine reliability and throttle response at high RPM
• Engineered and manufactured by HKS with direct RB26DETT GT-R motorsport development experience

Specifications

• Part Number: 22004-AN002
• Application: Exhaust camshaft side
• Compatible Engines: Nissan RB20DE(T), RB25DE(T), RB26DETT
• Drive Type: Timing belt (not for chain-drive applications)
• Material: A2014 Duralumin (hard anodized)
• Gear Teeth Treatment: Nickel-plated (Hv: 500)
• Finish: Hard anodized purple
• Scale Type: Vernier
• Adjustment Range: ±20° (advance/retard)
• Adjustment Interval: 2° per mark
• Timing Marks: Laser-etched with A (advance) and R (retard) directional indicators
• CARB Status: Not approved - not for street use in California
• UPC: 816532022980

Included Components

• 1x HKS adjustable exhaust cam gear / slide pulley (22004-AN002)

Product Description

The HKS 22004-AN002 is an adjustable exhaust camshaft gear - also referred to as a slide cam pulley - for Nissan's RB-series DOHC engines, covering the RB20DE(T), RB25DE(T), and RB26DETT across the Skyline R32, R33, R34, Stagea, Laurel, Cedric/Gloria, Cefiro, and Leopard platforms. The primary purpose of an adjustable cam gear is to allow fine-tuning of camshaft timing relative to the crankshaft - enabling the tuner to advance or retard the exhaust cam within a ±20° window to optimize the engine's power characteristics for a specific build. This is especially critical when running aftermarket camshafts such as the HKS Step 2 or Step 3 profiles, which are manufactured to a designed valve timing centerline that requires verification and adjustment on the actual engine to account for manufacturing variation, chain/belt stretch, and head gasket thickness changes.

The 22004-AN002 is manufactured from A2014 Duralumin - a high-grade aerospace aluminum alloy chosen by HKS engineers specifically for its combination of low density and high structural strength. The current version delivers 50% greater strength and 30% greater hardness versus the previous HKS RB cam gear, while also reducing rotational mass by approximately 10%. This matters on high-revving RB engines where reduced rotational inertia at the camshaft translates to slightly improved throttle response and reduced load on the timing belt drive. The nickel-plated gear teeth (Hv 500, up from Hv 350 on the prior version) provide substantially improved wear resistance against the increased tension of uprated timing belts and the occasional ingress of carbon debris common in high-mileage performance engines.

The Vernier adjustment scale is laser-etched at 2° intervals directly into the hard-anodized Duralumin surface, with "A" (advance) and "R" (retard) directional markers for unambiguous setup reference. The slide mechanism allows stepless adjustment within the ±20° range once the mounting bolts are loosened, with no special tooling required beyond basic hand tools. After installation, cam timing should be confirmed with a degree wheel and the engine dyno-tuned to identify the optimal advance/retard position for the specific cam profile, boost target, and power band goal. For a complete adjustable cam gear set on the exhaust and intake sides, pair the 22004-AN002 with the HKS 22004-AN001 intake cam gear.