1. Engine Crankshafts Products
  2. sku: 20387407154868721
  3. POWERBOND DAYCO SX-3664

POWERBOND BY DAYCO SX-3664 Engine Harmonic Balancer Cylinder 6.5L V8 Oj

fits model: C2500. make: Gmc. year: 1994–2000.

Sx-3664 Powerbond By Dayco Engine Harmonic Balancer For 1994-2000 Gmc C2500 6.5l V8 Cylinder Oj

( Brand: Powerbond By Dayco ), ( Manufacturer Part Number: SX-3664 ), ( Item Weight: 12.3500 ), ( Ipn: C459 42-11 ), ( Placement On Vehicle: Engine Cylinder Block ), ( Compatible Year: 2000 1999 1998 1997 1996 1995 1994 ), ( Core Charge: Free No Core Charge ), ( Type: Engine Harmonic Balancer ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Dayco Engine Harmonic Balancer ), ( Timing Marks: Yes ), ( Overall Width: 2.441 In / 62.00 Mm ), ( Hardware Included: No ), ( Ring Width: 1.319 In / 33.48 Mm ), ( Counterweight Balance: Hub Weighted ), ( Outer Ring Material: Cast Iron ), ( Overall Outside Diameter: 7.993 In / 203.00 Mm ), ( Nose Outside Diameter: 2.334 In / 59.27 Mm ), ( Crank Bore: 1.600 In / 40.62 Mm )

Review POWERBOND BY DAYCO Engine Harmonic Balancer Gmc 6.5l V8 Cylinder Oj fits C2500 1994–2000

The **Powerbond Dayco SX-3664 Engine Harmonic Balancer** is a high-performance, precision-engineered replacement part designed specifically for the **1994 2000 GMC C2500** equipped with the **6.5L V8 (Oldsmobile Jetfire/General Motors L36) engine**, featuring the **OJ cylinder block**. This critical component plays a vital role in dampening engine vibrations, reducing drivetrain stress, and enhancing overall drivability by smoothing out the rotational forces generated by the crankshaft. Crafted from **high-strength steel**, the SX-3664 harmonic balancer is built to withstand the demanding torque and RPM demands of this robust V8, ensuring long-lasting durability and reliability under heavy loads, towing, or high-performance applications.

What sets the Powerbond Dayco SX-3664 apart is its **advanced rubber compound formulation**, which is engineered to maintain optimal flexibility and resilience across a wide temperature range, from extreme cold starts to prolonged high-stress operation. This prevents premature cracking, deformation, or failure, which can lead to catastrophic engine damage if the balancer shatters mid-operation. The part is meticulously balanced during manufacturing to minimize residual vibration, further contributing to a quieter, smoother engine operation and reducing wear on connected components like the serpentine belt system, water pump, and alternator. Installation is straightforward, requiring only basic tools, and the balancer is designed to fit seamlessly with the stock pulley and mounting hardware, ensuring a perfect alignment with the crankshaft.

Ideal for both **restoration projects** and **modern high-mileage vehicles**, the Powerbond Dayco SX-3664 is a trusted upgrade for owners seeking to eliminate annoying engine vibrations, prevent costly repairs, and extend the lifespan of their **6.5L V8-powered GMC C2500**. Whether used in a classic muscle truck, a daily driver, or a towing application, this harmonic balancer delivers the strength, precision, and performance needed to keep the engine running smoothly making it an essential component for maintaining the integrity of this legendary powertrain.

### **Pros and Cons of Buying a Powerbond Dayco SX-3664 Engine Harmonic Balancer for a 1994 2000 GMC C2500 6.5L V8 (Oldsmobile Jetfire/Buick Rainier/GM 6.5L V8)**

#### **Pros**

1. **OEM Replacement Quality** The Powerbond/Dayco SX-3664 is a direct replacement for the original GM harmonic balancer, ensuring proper fitment and compatibility with the 6.5L V8 engine. It uses high-quality materials and is designed to match the original specifications, reducing the risk of premature failure.

2. **Durability and Performance** The balancer is constructed with reinforced rubber and steel components, which helps dampen engine vibrations more effectively than lower-quality aftermarket alternatives. This can improve drivability and reduce excessive noise or shuddering, especially in high-performance or modified engines.

3. **Warranty Coverage** Powerbond/Dayco products typically come with a manufacturer s warranty (often 1 2 years), providing some peace of mind against defects in materials or workmanship. This is more reliable than unbranded or no-name balancers with no warranty.

4. **Ease of Installation** The SX-3664 is a straightforward bolt-on replacement, requiring no modifications to the engine. It uses the same mounting points and bolt pattern as the original GM part, making installation accessible for most mechanics or DIYers with basic tools.

5. **Compatibility with Common Modifications** Since the 6.5L V8 is a popular engine in trucks, performance builds, and restorations, this balancer is often used in conjunction with turbocharging, forced induction, or high-performance tuning. Its robust construction can better handle increased stress from these modifications compared to weaker aftermarket alternatives.

6. **Reduced Risk of Catastrophic Failure** The original GM harmonic balancer is known to fail catastrophically (shedding rubber or breaking apart), which can damage the timing chain, oil pump, or other components. A quality replacement like the SX-3664 minimizes this risk by using more durable materials.

7. **Positive User Feedback** Many owners and mechanics report satisfaction with the Powerbond/Dayco balancer for the 6.5L V8, citing improved smoothness and longevity compared to cheaper alternatives. Online forums and reviews often highlight its reliability in both stock and modified applications.

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#### **Cons**

1. **Cost Compared to Cheaper Alternatives** The SX-3664 is more expensive than no-name or generic harmonic balancers (often $50 $100 vs. $20 $40 for knockoffs). While the price reflects better quality, it may not be justified for budget-conscious buyers who prioritize cost over longevity.

2. **Potential for Counterfeit Products** Some sellers may offer "Powerbond" or "Dayco" balancers that are counterfeit or mislabeled. Buyers should purchase from reputable suppliers (e.g., RockAuto, Summit Racing, or authorized dealers) to ensure they receive the genuine article. Checking the part number and verifying the seller s reputation is crucial.

3. **Limited Long-Term Data on Aging Engines** While the SX-3664 is a significant upgrade over the original GM balancer, very high-mileage engines (especially those with severe wear or modifications) may still experience issues over time. No balancer is indestructible, and wear can occur with extreme use or neglect.

4. **Installation Challenges for Inexperienced DIYers** While the balancer itself is simple to install, some users may encounter difficulties aligning the timing marks or ensuring the balancer is properly torqued. Improper installation can lead to premature failure or vibration issues. Consulting a mechanic or following a detailed guide is advisable.

5. **Not a Permanent Fix for Underlying Issues** If the engine has other problems (e.g., worn mounts, excessive vibration from a damaged flywheel, or a failing crankshaft), replacing just the harmonic balancer may not fully resolve drivability issues. A comprehensive inspection is recommended before purchase.

6. **Weight Considerations in High-Performance Builds** Some aftermarket balancers are lighter than the original, which can improve engine response in high-RPM applications. The SX-3664 is heavier than some performance-oriented alternatives, which might not be ideal for extreme tuning projects.

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### **Conclusion and Recommendation**

The **Powerbond Dayco SX-3664 harmonic balancer is a strong, reliable choice** for the 1994 2000 GMC C2500 6.5L V8 engine. It offers significant improvements over the original GM part in terms of durability, vibration damping, and compatibility with modifications. For most owners whether restoring a stock engine or building a performance truck this balancer provides a good balance of quality, warranty coverage, and ease of installation.

**Recommendation:** - **Buy the SX-3664 if:**

- You want a direct OEM replacement with proven reliability.

- You re running a modified engine (turbocharged, forced induction, or high-performance tuning).

- You prioritize longevity and want warranty protection.

- You re installing it yourself and are comfortable with basic engine work.

- **Consider alternatives if:**

- You re on a tight budget and can find a reputable no-name balancer (e.g., from a trusted seller with good reviews).

- You re working on a very high-mileage engine with other known issues (e.g., worn mounts or a failing crankshaft), and you d prefer to test a cheaper option first.

- You re building a high-performance engine and want a lighter balancer for better engine response.

**Final Advice:**

- Purchase from a trusted supplier to avoid counterfeit parts.

- Inspect the balancer for defects upon receipt (check for cracks, uneven rubber, or damage).

- Ensure the engine mounts and related components are in good condition before installation.

- Follow the manufacturer s torque specifications and consult a professional if unsure about installation.

For the average owner, the **Powerbond/Dayco SX-3664 is the best choice** for a harmonic balancer that will last and perform reliably.

Details:

Dayco Engine Harmonic Balancer for 1994 - 2000 GMC C2500 6.5L V8 Cylinder oj: Status: In Stock.

specifications cranshafengin:

  • for models: C2500
  • for makes: Gmc
  • for years: 1994-2000
  • brand: Powerbond By Dayco
  • mpn: Sx-3664
  • item weight: 12.3500
  • ipn: C459 42-11
  • placement on vehicle: Engine Cylinder Block
  • compatible year: 2000 1999 1998 1997 1996 1995 1994
  • core charge: Free No Core Charge
  • type: Engine Harmonic Balancer
  • fitment type: Direct Replacement
  • bundle description: 1 Pc Genuine Dayco Engine Harmonic Balancer
  • timing marks: Yes
  • overall width: 2.441 In / 62.00 Mm
  • hardware included: No
  • ring width: 1.319 In / 33.48 Mm
  • counterweight balance: Hub Weighted
  • outer ring material: Cast Iron
  • overall outside diameter: 7.993 In / 203.00 Mm
  • nose outside diameter: 2.334 In / 59.27 Mm
  • crank bore: 1.600 In / 40.62 Mm

shipping cranshafengin:

  • service: Standard, Expedited
  • type: Fixed
  • cost: $0.00
  • class: Standard, Expedited
  • transit: 3-6 Days

general cranshafengin:

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

offer cranshafengin:

  • availability: In Stock
  • options: Ship-to-home
  • quantity: 2
  • sold: 0
  • started: May 16, 2026

seller cranshafengin:

  • # reviews: 657778
  • city: Indianapolis, Indiana
  • rating: 99.6%

returns cranshafengin:

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

payments cranshafengin:

  • credit card: Discover
  • wallet: Google-pay
  • other
for models: c2500, for makes: gmc, for years: 1994-2000, item weight: 12.3500, placement on vehicle: engine cylinder block, compatible year: 2000 1999 1998 1997 1996 1995 1994, core charge: free no core charge, type: engine harmonic balancer, fitment type: direct replacement, bundle description: 1 pc genuine dayco engine harmonic balancer, timing marks: yes, overall width: 2.441 in / 62.00 mm, hardware included: no, ring width: 1.319 in / 33.48 mm, counterweight balance: hub weighted, outer ring material: cast iron, overall outside diameter: 7.993 in / 203.00 mm, nose outside diameter: 2.334 in / 59.27 mm, crank bore: 1.600 in / 40.62 mm,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 20387407154868721,
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