Adjustable Cam Gears for K20, B18, 4G63, EJ, RB & 2JZ Engines

What This Collection Covers

An adjustable cam gear changes the relationship between the camshaft and crankshaft by small measured increments. It is a tuning component for engines with compatible camshaft timing systems and is most useful when paired with aftermarket cams, forced induction, head work, or a calibrated dyno tune.

Cam Timing Adjustment

Advancing or retarding a camshaft moves the valve events relative to piston position. The correct setting depends on the cam profile, compression, turbo or supercharger setup, cylinder head flow, and intended rpm range.

Buying Notes

Confirm the exact application and installation requirements before ordering. The product page fitment details and manufacturer instructions should guide final selection.

Platform-Specific Gears

Cam gears are not universal. Tooth profile, belt or chain drive design, cam bolt pattern, trigger provisions, and variable-valve-timing compatibility vary by engine family. Order for the exact engine code and cam position.

Buying Notes

Confirm the exact application and installation requirements before ordering. The product page fitment details and manufacturer instructions should guide final selection.

Installation and Degreeing

A cam gear should be installed using the manufacturer torque specification and degree marks. Professional engine builders degree cams with a degree wheel and dial indicator instead of relying only on the printed zero mark.

Buying Notes

Confirm the exact application and installation requirements before ordering. The product page fitment details and manufacturer instructions should guide final selection.

Supporting Timing Components

Timing belts, chains, tensioners, guides, cam seals, valve springs, and camshafts should be assessed together. A worn timing component can undo the accuracy and reliability of a carefully set cam gear.

Buying Notes

Confirm the exact application and installation requirements before ordering. The product page fitment details and manufacturer instructions should guide final selection.

Top Brands

• HKS. Slide cam pulleys for Nissan, Toyota, Mitsubishi, and Subaru performance engines
• GReddy. Adjustable cam gears and cam sprockets for Japanese performance platforms
• Brian Crower. Billet adjustable cam gears and camshaft systems
• Skunk2. Honda-focused adjustable cam gears and valvetrain products
• GSC Power-Division. Performance camshafts, springs, and timing components
• BLOX Racing. Honda and Acura adjustable cam gears
• AEM. Engine-management and performance timing support
• Tomei. Nissan and Subaru performance engine components
• Toda Racing. Honda and Japanese-engine camshaft hardware
• Kelford Cams. Camshafts and valvetrain parts for turbo engines
• COMP Cams. Camshafts and timing components for domestic builds
• Crower. Performance camshafts and valvetrain products
• Manley. Engine internals and timing support hardware
• Supertech. Valvetrain components and retainers
• Fidanza. Adjustable cam gears and timing accessories

How to Choose the Correct Part

• Confirm the engine code, cylinder head, and camshaft position
• Verify whether the engine uses a timing belt, chain, or VVT system
• Match the gear tooth profile and camshaft bolt pattern
• Check whether one gear or an intake and exhaust pair is required
• Use cam-degreeing tools for a performance engine build
• Confirm clearance with the timing cover and cam sensor hardware
• Replace worn belts, chains, tensioners, and seals during the service
• Follow the gear manufacturer torque specification and fastener guidance
• Plan for a professional tune after meaningful cam timing changes
• Record the final cam timing setting for future service

Common Questions

What does an adjustable cam gear do?

An adjustable cam gear allows small changes to camshaft timing so the engine builder can tune valve events for the specific combination.

Do I need a tune after installing cam gears?

A tune is strongly recommended when cam timing is changed because airflow and power delivery can change.

Can I install cam gears without aftermarket camshafts?

Some engines can benefit from precise adjustment with stock cams, but adjustable gears are most commonly used with modified camshafts or built engines.

Are cam gears universal?

No. Cam gears are engine-specific and must match the timing drive, camshaft bolt pattern, tooth profile, and application.

What is cam degreeing?

Cam degreeing measures actual valve events relative to crankshaft position to verify the cam is installed at the intended timing.

Should I replace the timing belt with cam gears?

If the timing belt or chain service is due, replace worn timing components while access is open. Follow the engine service interval.

Can cam timing affect idle quality?

Yes. Significant timing changes can affect idle, vacuum, torque delivery, and emissions behavior.

Do I need one cam gear or two?

Single-cam engines may use one gear. Dual-overhead-cam engines may use an intake and exhaust gear depending on the platform.

Can adjustable cam gears work with VVT?

Compatibility depends on the engine design. Many variable-valve-timing engines require application-specific components or retain the factory phaser.

How much adjustment is safe?

Use the camshaft and engine-builder recommendation. Excessive adjustment can reduce piston-to-valve clearance or move the powerband away from the goal.

Why Buy Cam Gears from Black Ops Auto Works

Black Ops Auto Works stocks 49 cam gears SKUs with real fitment data, competitive pricing, and support from staff who build these vehicles themselves. Products are filterable by year, make, model, trim, engine, and drivetrain to confirm the correct application before ordering.

For focused shopping, browse our Camshafts, COMP Cams, Timing Chains, Valve Springs and Retainers, Valve Seals, Head Components, Skunk2 Racing and Brian Crower collections.