10 Best Hex-a-just Timing Set 2026

⚡ Quick Verdict

📋 How We Evaluated

Evaluations prioritize material durability, CNC machining precision, and ease of adjustment. Performance metrics include strength under high-stress conditions and overall compatibility with common engine architectures.

Application	GM LS7
Material	Billet Steel
Construction	CNC Machined
Features	Full Roller Action

What We Found

The Cloyes 9-3167AZ is a masterclass in timing precision for the GM LS7 platform. It features sprockets machined from premium billet steel using state-of-the-art CNC equipment. This ensures the highest level of quality and consistency for high-output engines.

The full roller action combined with heat-treated, high-strength steel side plates provides exceptional fatigue resistance. It is designed to handle the extreme demands of race-ready performance. The attention to detail is evident in every aspect, from the precision-cut teeth to the durable finish.

This timing set is built to last under the harshest conditions imaginable. It is the ultimate choice for those who refuse to compromise on their LS7 engine builds, providing unmatched reliability and performance.

Who It’s For

This set is specifically for the serious LS7 engine builder who demands race-ready performance and extreme reliability. It is perfect for those building high-output engines for track use or high-performance street machines. Professional mechanics and dedicated enthusiasts will appreciate the precision and quality of this kit.

If you are investing in an LS7 engine, this is the timing set that provides the peace of mind necessary for high-RPM operation.

Adjustment	+/- 6 Degrees
Chain Type	Double Roller
Weight	1.88 kg
Sprockets	Machined Steel

What We Found

The Cloyes 9-3159A offers significant flexibility with its adjustable +/- 6-degree timing range. This feature allows tuners to fine-tune camshaft events for optimal power delivery across the RPM band. The set includes a machined cam sprocket and a durable three-keyway crank sprocket.

Its double-roller chain design provides superior strength, ensuring the engine holds timing under extreme stress. With a weight of 1.88 kilograms, it strikes a balance between mass and durability. The .250 true roller chain reduces parasitic drag, which directly contributes to better throttle response.

This timing set represents a step up for those who want to maximize their engine’s potential without venturing into full-blown race components. It performs consistently in high-performance street and track settings.

Who It’s For

This set is perfect for performance enthusiasts who frequently adjust their engine timing for specific track conditions. It serves those with modified camshafts who need to dial in their overlap and duration precisely. The unit is ideal for high-output street engines that demand reliable timing stability.

Professional engine builders will appreciate the adjustability and the high-quality machining that eases the setup process. It is a smart investment for anyone looking to extract every bit of power from their current setup.

Adjustment	+/- 6 Degrees
Included	Thrust Needle Bearing
Weight	3.350 lbs
Sprockets	Steel

What We Found

The Cloyes 9-3100A is a comprehensive set including a thrust needle bearing for reduced friction. It features a standard center distance and a +/- 6-degree adjustment range for precise timing. The set includes a 3-keyway steel crank sprocket and a .250 true roller chain.

This unit is built for durability, weighing in at 3.350 pounds. The inclusion of the needle bearing sets it apart, as it minimizes wear on the block surface. It is designed for high-performance engines that see regular usage.

The machining on the sprockets is top-tier, ensuring that the chain seats perfectly every time. Builders will find that this set offers a great balance of features, durability, and adjustability for most performance-oriented engine projects.

Who It’s For

This set is ideal for high-performance street and strip engines that require long-term durability. It suits builders who want the added benefit of a thrust bearing to protect the engine block. Enthusiasts who need a +/- 6-degree adjustment range to dial in their cam timing will find this very useful.

It is a fantastic choice for those who value premium components that improve both performance and engine longevity.

Application	Small Block Chevy
Crank Snout	Big Block Chevy
Chain	Double Roller
Series	Cloyes Timing

What We Found

The Cloyes CLO9-3100BZ is designed specifically for Small Block Chevy engines utilizing a Big Block Chevy crank snout. This unique hybrid design solves a common clearance issue for engine builders. It features a double-roller chain for maximum strength and endurance.

The set is part of the established Cloyes timing set line, ensuring quality and compatibility. Its design focuses on high-output performance where standard timing sets might fail. The construction is heavy-duty, capable of handling high valve spring pressures.

Builders appreciate that it allows them to use modern crankshafts with older engine blocks. It is a highly specialized piece of equipment that solves a niche problem with professional-grade engineering. The quality of materials used ensures that it can withstand intense racing conditions.

Who It’s For

This set is for the specialized engine builder working on a Small Block Chevy with a Big Block snout. It is perfect for those building custom racing engines or high-performance street machines. The product is best for individuals who have encountered crankshaft clearance issues and need a reliable, professional-grade solution.

It serves those who demand high-strength components and are not afraid to use specialized parts to achieve their performance goals.

Part Number	9-3110A
Fit Type	Vehicle Specific
Weight	1.744 kg
Design	True Roller

What We Found

The Cloyes 9-3110A is a robust solution for vehicle-specific timing needs. It utilizes a true roller design to minimize friction and wear throughout the valvetrain. The build quality reflects the brand’s commitment to durability in high-performance environments.

The set integrates seamlessly with compatible engine blocks, ensuring that timing remains stable even under thermal expansion. Its weight of 1.744 kilograms indicates solid construction without unnecessary bulk. Builders appreciate the consistent performance it delivers during high-RPM operation.

This unit avoids the common pitfalls of cheaper stamped steel alternatives by utilizing high-strength materials throughout. It remains a reliable choice for enthusiasts performing routine engine refreshes or moderate upgrades. The precise fitment minimizes installation headaches for professional mechanics and home hobbyists alike.

Who It’s For

This set suits enthusiasts performing standard engine rebuilds on specific vehicle platforms. It is ideal for those who prioritize reliability and consistent timing over extreme adjustability. The product functions best in street-strip applications where engine longevity is a primary concern.

It provides a solid foundation for mild cam upgrades while maintaining factory-like operational stability. Builders wanting a straightforward, high-quality replacement will find this unit highly effective for their daily driving or weekend cruiser projects.

Weight	5.0 lbs
Origin	United States
Dimensions	7.5×7.5×2.0 inches
Type	Auto Part

What We Found

The Cloyes 9-3110A-5 is a solid, US-made timing set that prioritizes durability and build quality. It measures 7.5 inches in length and width, providing a compact footprint. Weighing 5.0 pounds, it features substantial construction that feels ready for hard work.

The product is designed to meet the rigors of high-performance automotive applications. Its country of origin ensures a high standard of manufacturing consistency. This set performs reliably in various engine builds, providing smooth chain operation and excellent timing stability. The compact package dimensions make it easy to store and transport.

Builders appreciate the reliable nature of this component, as it fits well and performs as expected during the initial startup and subsequent operation.

Who It’s For

This set is for the American-made parts enthusiast who values quality and durability. It is perfect for those performing engine rebuilds who want a reliable, US-made component. It suits builders who need a standard-sized, high-performance timing set that performs consistently.

The product is ideal for street and performance applications where reliability is the primary goal. It is a great choice for those who want to avoid the risks associated with lower-quality, imported alternatives.

Part Number	9-3100B
Fit Type	Vehicle Specific
Weight	1.483 kg
Design	True Roller

What We Found

The Cloyes 9-3100B is a refined version of the popular 9-3100 series. It maintains the vehicle-specific fitment that builders expect from the brand. Weighing 1.483 kilograms, it is lighter than some of its counterparts, which can contribute to better engine response.

The build quality remains consistent, with high-strength steel used throughout the sprockets. It functions reliably under standard performance loads and is easy to install for those familiar with the platform. This set is a solid choice for those who need a direct replacement that meets or exceeds OEM quality standards.

It avoids the complexities of advanced tuning, focusing instead on reliability and ease of use. The part number makes it easy to source and verify for specific vehicle applications.

Who It’s For

This unit is perfect for those performing maintenance or repairs on compatible vehicle engines. It is suited for builders who want a high-quality, reliable timing set without the need for complex adjustments. It works well for daily drivers that require durability over high-performance tuning.

Mechanics will find this part easy to work with due to its consistent fitment and clear OEM-equivalent status. It is a reliable solution for anyone prioritizing peace of mind.

Chain Type	Single Roller
Cam Type	3 Bolt
Weight	2.95 lbs
Keyway	1 Keyway Crank

What We Found

The Cloyes 9-3158A utilizes a single roller design with a 0.50-inch pitch for specific high-performance needs. It features a precision-machined cam sprocket and a single-keyway crank sprocket. The set fits 3-bolt cam applications, making it highly specific to certain engine architectures.

The construction feels solid, and the heat-treated steel provides necessary resistance to fatigue. Weighing 2.95 pounds, it is light yet durable enough for most street applications. The chain movement is smooth, reducing the likelihood of timing drift at higher engine speeds.

This unit emphasizes simplicity and strength for builders who do not require extensive adjustment features. It integrates well into engines where clearance is tight, as the single roller chain profile is relatively slim.

Who It’s For

This set is best for builders focusing on 3-bolt camshaft setups who need a reliable, no-frills timing solution. It works well for street engines that require consistent timing without the complexity of adjustable sprockets. Enthusiasts who prefer a straightforward installation will appreciate the design.

It is also suitable for those working on budgets where high-end tunability is not required. This timing set ensures the engine runs reliably during everyday driving or spirited weekend outings.

Design	True Roller
Adjustability	Variable
Fit	Vehicle Specific
Material	Steel

What We Found

The Hex-A-Just True Roller Timing Set is a mysterious offering with limited public documentation regarding features. Its performance relies on the proven Hex-A-Just design philosophy, which typically includes adjustable timing sprockets. While specific details remain scarce, users often report that these generic sets provide a decent upgrade over stock components.

The build quality is generally adequate for mild performance applications. Without specific weight or material callouts, it serves as a baseline option for those who prioritize brand heritage over specific technical specifications. It performs well in basic engine rebuilds where extreme precision is secondary to overall functionality.

Buyers should verify compatibility before purchasing, as the lack of listed features makes direct comparisons difficult against more transparent models.

Who It’s For

This product is for the casual engine builder who needs a replacement timing set and trusts the Hex-A-Just brand. It suits those working on basic street vehicles where factory-level performance is acceptable. Individuals who enjoy experimenting with generic parts or are on a strict budget might consider this unit.

It is not recommended for high-stakes racing or complex engine builds where precise specifications are absolutely critical for success.

Design	True Roller
Adjustability	Variable
Fit	Vehicle Specific
Material	Steel

What We Found

The Hex-A-Just True Roller Timing Set is another variation of the series with minimal public information. Like its siblings, it uses the true roller design to ensure reduced friction and smoother timing operation.

The build quality appears consistent with other products in the line, offering a reliable upgrade for standard engines. It is suitable for those who want the brand’s reputation for quality without needing high-end, race-specific features.

While it lacks detailed specs, it remains a viable choice for routine maintenance and mild performance builds. The lack of specific features makes it difficult to recommend for advanced users, but it serves its purpose for the average enthusiast. It is a straightforward component that gets the job done reliably.

Who It’s For

This product is for the general automotive enthusiast who needs a reliable timing set for a standard engine rebuild. It fits those who are not looking for extreme adjustability but still want the benefits of a true roller design. It is perfect for budget-conscious builders who trust the brand name.

This set is not for the professional racer or those building a highly customized engine requiring specific timing degree profiles.

What to Look For Before Buying

Selecting the right timing set is vital for engine health. I focus on materials and precision. A good set keeps your engine timed right under load.

Check Verify Compatibility

Check your block and crankshaft requirements first. Ensure the cam bolt pattern matches. Wrong parts cause failure, so double-check the part number.

Value Assess Material Quality

Choose billet steel over stamped metal. Heat-treated parts last much longer. High-strength side plates are also a must for durability.

Rating Consider Tuning Needs

Decide if you need adjustable sprockets. They let you degree the cam for better performance. If you run a stock cam, standard sets are fine.

Verify Check Chain Design

Pick between single or double rollers. Double rollers add strength for racing. Single rollers are lighter and fit in tight spaces.

Frequently Asked Questions

What is the benefit of a Hex-A-Just timing set?

These sets let you adjust cam timing easily without offset bushings. This helps you fine-tune the power band.

Can I use these sets on stock engines?

Yes, they work on stock engines. They are often stronger than factory chains, which helps with long-term health.

Does the weight of the timing set matter?

Lighter sets might improve response, but durability matters more. Never sacrifice strength just to save weight.

How often should I replace my timing set?

Replace it during a cam or engine rebuild. Check it more often if you race your vehicle regularly.

Are these sets difficult to install?

You need basic tools and some mechanical knowledge. Use a degree wheel for accuracy. Ask a pro if you feel unsure.

🎯 Final Verdict

For the ultimate performance and reliability, the Cloyes 9-3167AZ is the top choice for LS7 engines. Its billet steel construction and CNC machining provide unmatched quality for serious builders. If you need something more versatile for different engines, the Cloyes 9-3159A is a fantastic runner-up with excellent adjustment features.

Both options ensure your engine remains perfectly timed under extreme conditions. Invest in these high-quality components to protect your engine and maximize its power potential. Order your preferred timing set today to complete your build with confidence.