MOROSO Harmonic Balancer Bolt Gm Ls Thread 084663387760 16MM 2.00 4.25

( Brand: Moroso ), ( Part Type: Balancer Bolt ), ( Air Restricted: No ), ( UPC: 084663387760 )

Review MOROSO Harmonic Balancer Bolt Gm Ls Series 16mm 2.00 Thread 4.25 Inch

The **Moroso 084663387760 Harmonic Balancer Bolt** is a precision-engineered, high-performance replacement part meticulously designed to restore optimal function and longevity to your GM LS-series engine, specifically tailored for applications requiring a **16mm thread with a 2.00 pitch**. This bolt serves as a critical component of the harmonic balancer assembly, playing a pivotal role in dampening engine vibrations, reducing torsional stress, and ensuring smooth rotational stability especially under high-performance or heavy-duty conditions. Crafted from **high-grade, heat-treated steel**, this bolt is engineered to withstand the extreme forces and thermal cycling inherent in modern high-output engines, delivering exceptional durability and resistance to fatigue, warping, or premature failure. The **4.25-inch length** strikes a precise balance between structural integrity and proper clearance within the engine bay, allowing for seamless installation without interference with surrounding components. Whether you're rebuilding a stock LS engine for reliable daily driving or fine-tuning a high-performance build with forced induction or turbocharging, this bolt ensures a secure and vibration-dampening connection between the harmonic balancer and the crankshaft, safeguarding against costly damage to the balancer, crankshaft, or related drivetrain elements. Moroso s commitment to quality is evident in the **tight tolerances and rigorous machining** of this bolt, which adheres to strict automotive industry standards while offering a direct-fit solution for GM LS engines. Installing this bolt as part of a harmonic balancer overhaul or as a standalone replacement is a straightforward yet impactful upgrade, reinforcing the engine s structural integrity and contributing to a quieter, more refined operation. Trusted by mechanics and enthusiasts alike for its reliability and performance, the Moroso 084663387760 bolt is an indispensable component for maintaining or enhancing the health of your LS-series powertrain.

Buying the **Moroso 084663387760 harmonic balancer bolt** (16mm thread, 2.00" length, for GM LS engines) has specific advantages and drawbacks depending on your needs, budget, and priorities. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of buying a Moroso 084663387760 Bolt**

1. **High-Quality Material and Construction**

Moroso is a well-regarded brand in the aftermarket automotive parts industry, known for producing durable, precision-engineered components. This bolt is likely made from high-strength steel or a similar robust material, designed to withstand the stresses of a harmonic balancer assembly. The threading and machining should be precise, reducing the risk of stripping or premature failure.

2. **Direct Fitment for GM LS Engines**

The part is explicitly listed as a direct replacement for GM LS-series engines, which include applications like the LS1, LS2, LS3, and LS4. This means it should align perfectly with the stock bolt pattern and thread spacing, eliminating the need for modification or adapters. Compatibility is critical when replacing a harmonic balancer bolt, as incorrect sizing can lead to vibration issues or damage to the balancer or crankshaft.

3. **Reliability and Longevity**

Harmonic balancers in LS engines are subjected to significant torsional forces, especially under high RPM or aggressive driving conditions. A quality bolt like this one from Moroso is less likely to loosen or fail over time compared to cheaper or generic alternatives. This can extend the lifespan of your harmonic balancer and reduce the risk of catastrophic failure (e.g., a broken bolt causing damage to the crankshaft or engine bay components).

4. **Ease of Installation**

Since the bolt is a direct replacement, installation should be straightforward for someone with basic mechanical skills. No special tools or modifications are typically required beyond a socket wrench and torque specifications (usually around 80 100 ft-lbs for LS engines). This makes it a convenient choice for DIYers or mechanics who prefer simplicity.

5. **Support and Warranty**

Moroso offers customer support and warranties on their products, which can provide peace of mind. If the bolt fails prematurely due to a manufacturing defect, you may be able to return it or get a replacement. This is particularly valuable if you re investing in a high-quality part for long-term use.

6. **Compatibility with Aftermarket Balancers**

If you re replacing your stock harmonic balancer with an aftermarket unit (e.g., a Moroso or JE aftermarket balancer), this bolt will ensure proper fitment. Many aftermarket balancers come with their own bolts, but using OEM or high-quality replacement bolts can prevent issues like vibration or imbalance.

7. **Cost-Effective for a Premium Part**

While Moroso parts are not the cheapest on the market, they strike a balance between affordability and quality. For a critical component like a harmonic balancer bolt, investing in a reputable brand can save money in the long run by avoiding repeated failures or damage to other engine parts.

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### **Cons of buying a Moroso 084663387760 Bolt**

1. **Price Relative to Generic Alternatives**

The Moroso bolt will likely cost more than generic or no-name bolts from lesser-known brands or online marketplaces (e.g., Amazon, eBay, or random aftermarket sellers). If your budget is tight, you might consider cheaper options, though this comes with trade-offs in reliability.

2. **Potential Overkill for Stock Applications**

If your harmonic balancer is still in good condition and you re only replacing the bolt due to a loose or stripped bolt from the original assembly, a high-end bolt like this may feel unnecessary. In such cases, a basic OEM replacement bolt (if available) or a mid-tier brand might suffice.

3. **Limited Availability or Lead Times**

Depending on where you purchase the bolt, you might encounter stock issues or longer lead times compared to more widely available parts. This could delay your project if you re in a hurry.

4. **Torque Specifications Must Be Followed Strictly**

Over-torquing or under-torquing the bolt can lead to issues. Over-torquing may strip the threads or damage the harmonic balancer hub, while under-torquing can cause the bolt to loosen over time. This requires careful attention during installation, which some DIYers may overlook.

5. **No Significant Performance Benefit**

Unlike performance parts (e.g., a high-performance harmonic balancer or crankshaft pulley), this bolt does not offer any performance advantages. It s purely a reliability and fitment upgrade. If your goal is purely cosmetic or you re not experiencing issues, the cost may not be justified.

6. **Potential for Counterfeit or Misrepresented Parts**

When purchasing from third-party sellers (e.g., eBay, Amazon, or random online stores), there s a risk of receiving counterfeit or mislabeled parts. Always buy from authorized Moroso dealers or reputable aftermarket suppliers to avoid this risk.

7. **Not a "One-Size-Fits-All" Solution**

While this bolt is designed for GM LS engines, there are subtle variations between LS1, LS2, LS3, LS4, and other variants (e.g., LS6, LS7). Ensure your specific engine application matches the part number exactly. Some LS engines (e.g., older LS1s) might require slightly different bolt lengths or thread depths, though this bolt is listed as a universal fit for most LS applications.

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### **Conclusion**

The **Moroso 084663387760 harmonic balancer bolt** is a solid choice for anyone replacing a bolt in a GM LS engine, particularly if you prioritize reliability, fitment, and longevity. It s an excellent option for:

- Rebuilding or replacing a harmonic balancer.

- Addressing a loose, stripped, or missing bolt in your stock balancer.

- Installing an aftermarket balancer where a high-quality bolt is desired.

- Projects where you want to avoid the risk of failure from cheaper alternatives.

- Your balancer is still functional, and you re only replacing the bolt due to a minor issue.

- You re on a tight budget and can find a similarly reliable bolt at a lower cost.

- You re purchasing from an untrusted seller, risking counterfeit parts.

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### **Recommendation**

- You re replacing a harmonic balancer or addressing a critical bolt failure.

- You want a high-quality, long-lasting solution with minimal risk of premature failure.

- You re installing an aftermarket balancer and need a compatible bolt.

- You re comfortable paying a premium for a reputable brand.

- Your balancer is still in good shape, and you only need a bolt for a minor repair.

- You find a similarly rated bolt (e.g., from **JE, Crane, or OEM**) at a lower price from a trusted seller.

- You re working on a budget and can accept a slightly higher risk of future issues.

Purchase from **authorized Moroso dealers, reputable aftermarket suppliers (e.g., Summit Racing, RockAuto, or local auto parts stores), or Moroso s official website** to ensure authenticity and warranty coverage. Avoid unknown sellers to prevent receiving counterfeit or damaged parts.

- Use a **torque wrench** and follow the manufacturer s specifications (typically **80 100 ft-lbs** for LS engines).

- Inspect the bolt hole and threads in the harmonic balancer hub for damage before installation.

- Consider using **thread locker (e.g., Loctite 271)** if your engine sees heavy loads or aggressive driving to prevent loosening.

- If replacing a balancer, ensure the new unit is properly balanced and aligned to avoid vibration issues.

In summary, the Moroso bolt is a **strong, reliable choice** for LS engine applications, but weigh the cost against your specific needs before purchasing. For most serious DIYers or mechanics, it s a worthwhile investment in durability.

Details:

Precision-machined to OEM specifications for reliable performance. The 12-point head design facilitates easy installation and removal in tight engine compartments, even with limited space. It is suitable for use in various GM LS engine applications, ensuring compatibility and ease of installation mechanics enthusiasts alike. Whether restoring an engine or enhancing performance, this bolt from MOROSO offers durability and precision craftsmanship to support your vehicles assembly.

Its 16mm diameter with a 2.00 thread pitch ensures secure fit, while the 4.25-inch length provides ample engagement for engine stability. 16mm diameter with 2.00 thread pitch for secure fit. Includes washer for proper load distribution. Washer included ensures proper load distribution and secure fastening for critical engine components.

The MOROSO Harmonic Balancer Bolt Part Number 38776 is designed specifically for GM LS-Series engines, including Gen III and IV applications. Features: designed for GM LS-Series engines, including Gen III and IV. Crafted from durable steel with a black oxide finish, this bolt offers reliable performance and corrosion resistance. Each bolt is precision-machined to meet OEM specifications, providing peace of mind during installation and operation.

Steel construction with black oxide finish for durability and corrosion resistance.

specifications cranshafengin:

• brand: Moroso
• part type: Balancer Bolt
• air restricted: No
• upc: 084663387760

seller cranshafengin:

• # reviews: 45601
• rating: 98.5%
• city: Saint Paul, Minnesota

payments cranshafengin:

• wallet: Apple-pay
• credit card: Discover
• other

shipping cranshafengin:

• class: Standard
• service: Standard
• type: Fixed
• transit: 3-5 Days
• cost: $0.00

general cranshafengin:

• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
• condition: New

offer cranshafengin:

• sold: 0
• options: Ship-to-home
• quantity: 2
• availability: In Stock
• started: March 31, 2026

returns cranshafengin:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

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