1. Engine Crankshafts Products
  2. sku: 18852539564177603
  3. POWERBOND DAYCO SX-5731

POWERBOND BY DAYCO SX-5731 Engine Harmonic Balancer 5.7L 6.6L 7.0L

fits model: Catalina. make: Pontiac. year: 1968–1978.

Sx-5731 Powerbond By Dayco Engine Harmonic Balancer For 1968-1978 Pontiac Catalina 5.7l 6.6l 7.0l Ft

( Brand: Powerbond By Dayco ), ( Manufacturer Part Number: SX-5731 ), ( Item Weight: 6.6100 ), ( Ipn: C243 20-50 ), ( Placement On Vehicle: Engine Cylinder Block ), ( Compatible Year: 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 ), ( 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: 3.249 In / 82.50 Mm ), ( Hardware Included: No ), ( Ring Width: 1.171 In / 29.74 Mm ), ( Counterweight Balance: Neutral, No Counterweight ), ( Outer Ring Material: Cast Iron ), ( Overall Outside Diameter: 6.752 In / 171.50 Mm ), ( Nose Outside Diameter: 1.869 In / 47.46 Mm ), ( Crank Bore: 1.375 In / 34.90 Mm )

Review POWERBOND BY DAYCO Engine Harmonic Balancer Pontiac 5.7l 6.6l 7.0l Ft fits CATALINA 1968–1978

The **Powerbond Dayco SX-5731 Engine Harmonic Balancer** is a meticulously engineered, high-performance replacement part designed specifically for the iconic 1968 through 1978 Pontiac Catalina models equipped with the legendary **389, 455, or 428 cubic inch V8 engines**, including the legendary **5.7L, 6.6L, and 7.0L displacement variants** found in the muscle-car era s most powerful and sought-after big-block configurations. Crafted from premium **cast iron with a precision-machined rubber insert**, this harmonic balancer is built to withstand the relentless demands of high-revving, high-torque applications while delivering superior vibration dampening and longevity compared to standard OEM or aftermarket alternatives. The SX-5731 features a **robust, reinforced design** with a **thick, high-quality rubber core** that absorbs engine harmonics effectively, reducing whitewall tire vibration and preventing premature wear on the crankshaft and drivetrain components. Its **precision-balanced construction** ensures smooth operation, even under heavy loads, making it an ideal choice for both street-driven Catalinas and those modified for drag racing, street racing, or high-performance towing. The **Dayco Powerbond brand** is synonymous with durability and reliability, and this balancer is no exception engineered to resist cracking, warping, or degradation over time, even under extreme operating conditions. Whether you re restoring a classic Catalina to its original glory or pushing a modified big-block to its limits, the SX-5731 harmonic balancer provides the **quiet, vibration-free performance** that enthusiasts demand, ensuring your engine runs with the precision and power it was designed for. Backed by Dayco s reputation for quality and backed by a **durable, long-lasting fit**, this balancer is the perfect upgrade for any Pontiac owner seeking to enhance both performance and drivability.

### Pros and Cons of Buying a Powerbond Dayco SX-5731 Engine Harmonic Balancer for a 1968 1978 Pontiac Catalina (5.7L, 6.6L, 7.0L V8)

#### **Pros:**

1. **Compatibility and Fitment** The Powerbond Dayco SX-5731 is specifically designed for Pontiac s 389, 455, and 428 cubic inch V8 engines, which power the 1968 1978 Catalina models with the 5.7L (389), 6.6L (455), and 7.0L (428) engines. This ensures an exact fit without modification.

2. **Durability and Quality** Powerbond is a well-regarded brand known for producing high-quality harmonic balancers. Their products are designed to withstand the stresses of high-performance engines, reducing the risk of premature failure.

3. **Reduced Vibration and Noise** A worn or failing harmonic balancer can cause excessive vibration, rattling, and even engine damage over time. Replacing it with a new Powerbond unit helps maintain smooth operation and reduces unwanted noise.

4. **Prevents Catastrophic Failure** Harmonic balancers act as a shock absorber for the crankshaft. A failing balancer can lead to cracked or broken components, which may damage the engine or transmission. Replacing it proactively avoids costly repairs.

5. **Easy Installation** The SX-5731 is a direct replacement, meaning it should install similarly to the OEM part with minimal adjustments. Most mechanics can install it in a few hours.

6. **Longer Lifespan** Unlike OEM parts, aftermarket harmonic balancers like this one are often built with reinforced materials, extending their service life compared to original equipment.

7. **Cost-Effective Solution** Replacing a harmonic balancer is significantly cheaper than repairing engine damage caused by a failing one. The cost is a small investment compared to potential engine repairs.

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#### **Cons:**

1. **Cost Compared to OEM** While still affordable, the Powerbond Dayco SX-5731 may be slightly more expensive than an OEM replacement part if available. However, OEM parts can sometimes be harder to source, especially for older vehicles.

2. **Potential for Counterfeit Parts** As with any aftermarket product, there is a risk of purchasing a counterfeit or low-quality imitation. Buying from a reputable dealer or directly from the manufacturer ensures authenticity.

3. **Installation Challenges** If the vehicle has been modified (e.g., performance upgrades, custom engine mounts, or drivetrain changes), the harmonic balancer may need additional attention to ensure proper alignment and function. A professional installation is recommended in such cases.

4. **Limited Warranty** Some aftermarket harmonic balancers come with shorter warranties compared to OEM parts. Powerbond typically offers a good warranty, but it s worth checking the specifics before purchasing.

5. **Not a Permanent Fix for Underlying Issues** If the engine mounts, flywheel, or other drivetrain components are worn or damaged, replacing just the harmonic balancer may not fully resolve vibration problems. A full drivetrain inspection is advisable.

6. **Potential for Misalignment** If not installed correctly, the balancer could cause additional stress on the crankshaft or engine mounts. This underscores the importance of following installation guidelines or having a professional handle the job.

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### **Conclusion:**

The Powerbond Dayco SX-5731 harmonic balancer is an excellent choice for restoring smooth operation and preventing potential engine damage in a 1968 1978 Pontiac Catalina with a 389, 455, or 428 V8 engine. Its compatibility, durability, and ease of installation make it a practical upgrade over a failing OEM part. However, it s important to ensure you re purchasing a genuine product and that the rest of the drivetrain is in good condition to maximize its effectiveness.

### **Recommendation:**

- **Purchase from a trusted source** (e.g., Powerbond s official website, reputable auto parts retailers, or a dealer specializing in classic Pontiacs) to avoid counterfeit parts.

- **Inspect the engine mounts, flywheel, and crankshaft** before installation to ensure they are not contributing to vibration issues.

- **Have the installation performed by a professional** if you re unsure about proper alignment or torque specifications.

- **Consider pairing this replacement with other drivetrain maintenance** (e.g., serpentine belt, tensioner, and pulleys) to extend the lifespan of the upgrade.

- **Monitor the engine for any unusual vibrations or noises** after installation. If issues persist, further diagnosis may be required.

For most owners of these classic Pontiacs, the Powerbond Dayco SX-5731 is a wise and cost-effective choice to maintain engine health and performance.

Details:

Dayco Engine Harmonic Balancer for 1968-1978 Pontiac Catalina 5.7L 6.6L 7.0L ft: Status: In Stock.

specifications cranshafengin:

  • for models: Catalina
  • for makes: Pontiac
  • for years: 1968-1978
  • brand: Powerbond By Dayco
  • mpn: Sx-5731
  • item weight: 6.6100
  • ipn: C243 20-50
  • placement on vehicle: Engine Cylinder Block
  • compatible year: 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968
  • 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: 3.249 In / 82.50 Mm
  • hardware included: No
  • ring width: 1.171 In / 29.74 Mm
  • counterweight balance: Neutral, No Counterweight
  • outer ring material: Cast Iron
  • overall outside diameter: 6.752 In / 171.50 Mm
  • nose outside diameter: 1.869 In / 47.46 Mm
  • crank bore: 1.375 In / 34.90 Mm

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  • sold: 0
  • availability: In Stock
  • quantity: 3
  • options: Ship-to-home
  • started: February 15, 2026

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  • rating: 99.5%
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  • # reviews: 622684

general cranshafengin:

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

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for models: catalina, for makes: pontiac, for years: 1968-1978, item weight: 6.6100, placement on vehicle: engine cylinder block, compatible year: 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968, 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: 3.249 in / 82.50 mm, hardware included: no, ring width: 1.171 in / 29.74 mm, counterweight balance: neutral, no counterweight, outer ring material: cast iron, overall outside diameter: 6.752 in / 171.50 mm, nose outside diameter: 1.869 in / 47.46 mm, crank bore: 1.375 in / 34.90 mm,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 18852539564177603,
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