1. Engine Crankshafts Products
  2. sku: 19564451639948603
  3. POWERBOND DAYCO SX-1939

POWERBOND BY DAYCO SX-1939 Engine Harmonic Balancer Cylinder V10 5.7L V8 Block

fits make: Chevrolet. year: 1987.

Sx-1939 Powerbond By Dayco Engine Harmonic Balancer For 1987 Chevrolet V10 5.7l V8 Cylinder Block Uu

( Brand: Powerbond By Dayco ), ( Manufacturer Part Number: SX-1939 ), ( Item Weight: 11.6700 ), ( Ipn: C826 81-14 ), ( Placement On Vehicle: Engine Cylinder Block ), ( Compatible Model: V10 ), ( Core Charge: Free No Core Charge ), ( Type: Engine Harmonic Balancer ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Dayco Engine Harmonic Balancer )

Review POWERBOND BY DAYCO Engine Harmonic Balancer Chevrolet V10 5.7l V8 Cylinder Block fits 1987

The **Powerbond Dayco SX-1939 Engine Harmonic Balancer** is a premium, high-performance replacement part meticulously engineered to restore optimal vibration damping and smooth operation to the **1987 Chevrolet V10 5.7L V8 cylinder block**, particularly those equipped with the iconic **Big Block** or **L34/L35** engine configurations. Designed as a direct drop-in replacement for the original equipment (OEM) harmonic balancer, this aftermarket upgrade combines cutting-edge materials and precision manufacturing to deliver superior durability, reduced engine noise, and enhanced longevity compared to standard offerings. Crafted from a **high-strength, heat-treated steel core**, the SX-1939 features a **multi-layered rubber insert** that is formulated to withstand extreme temperatures, high RPM loads, and the relentless stress of aggressive driving making it an ideal choice for both street machines and high-performance applications. The balancer s **precision-balanced weight distribution** ensures minimal torsional vibration, which is critical for maintaining engine stability, reducing wear on critical components like the crankshaft, timing chain, and cylinder head bolts, and preventing the dreaded "white smoke" or "knocking" issues that can plague older Big Blocks. Whether you re restoring a classic muscle car, preparing for a drag strip session, or simply seeking to eliminate the annoying hum of an aging harmonic balancer, the Powerbond SX-1939 delivers a seamless fit and a noticeable improvement in engine smoothness. Built to meet or exceed OEM specifications, this balancer is backed by Dayco s reputation for reliability, ensuring that it will perform flawlessly under the demanding conditions of daily driving, towing, or high-performance use. With its robust construction and attention to detail, the SX-1939 is not just a replacement part it s a strategic investment in the health and performance of your 5.7L V8, helping to preserve its power and longevity for years to come.

### **Pros and Cons of Buying a Powerbond Dayco SX-1939 Engine Harmonic Balancer for a 1987 Chevrolet V10 5.7L V8**

#### **Pros:**

1. **High-Quality Material and Construction** The Powerbond/Dayco SX-1939 is made from high-strength steel with a rubber insert designed to dampen engine vibrations effectively. This reduces wear on the crankshaft and drivetrain components, extending their lifespan.

2. **Direct Fitment** This harmonic balancer is specifically engineered for the 1987 Chevrolet 5.7L V8 (V10 designation is incorrect; it is a standard V8), ensuring proper alignment and compatibility without modifications.

3. **Durability and Longevity** Unlike cheaper aftermarket or OEM replacements, Powerbond/Dayco balancers are built to last longer, reducing the risk of premature failure, which can cause drivetrain damage or excessive vibration.

4. **Reduced Engine Noise and Vibration** A failing harmonic balancer can lead to excessive vibration, rattling, and even a "clunking" sound when accelerating. Replacing it with a new, high-quality unit improves smoothness and reduces noise.

5. **Prevents Crankshaft Damage** A worn balancer can cause uneven load on the crankshaft, leading to cracks or bending. Replacing it proactively avoids costly repairs to the crankshaft or connecting rods.

6. **Warranty Coverage** Powerbond/Dayco typically offers a warranty (usually 1 2 years), providing peace of mind against defects in materials or workmanship.

7. **Easier Installation** Since it is a direct replacement, installation is straightforward for a mechanic with basic engine knowledge, and it often comes with mounting hardware.

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#### **Cons:**

1. **Higher Upfront Cost** Compared to generic aftermarket balancers or salvaged parts, the Powerbond/Dayco unit is more expensive, which may be a deterrent for budget-conscious buyers.

2. **Potential Overkill for Some Applications** If the original balancer was still in decent condition (though visibly cracked or worn), some may argue that a full replacement isn t strictly necessary. However, a failing balancer should always be replaced to prevent damage.

3. **Requires Professional Installation** While the part itself is straightforward, improper installation (e.g., incorrect torque on bolts, misalignment) can lead to premature failure. This may necessitate a mechanic s involvement, adding labor costs.

4. **Limited Availability in Some Areas** Depending on location, this specific part may not be stocked at every auto parts store, requiring an online order or special trip to a performance parts dealer.

5. **Not a "Set-and-Forget" Solution** While durable, it is not indestructible. Under extreme conditions (e.g., high RPM abuse, severe engine modifications), it may still fail over time, requiring eventual replacement.

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### **Conclusion:**

The **Powerbond Dayco SX-1939 harmonic balancer is a strong, reliable choice** for a 1987 Chevrolet 5.7L V8. Its superior quality, direct fitment, and long-term benefits in reducing vibration and preventing crankshaft damage make it a worthwhile investment especially if the original balancer is cracked, worn, or showing signs of failure. While the cost is higher than some alternatives, the potential savings from avoiding drivetrain damage and engine issues justify the expense.

**Recommendation:**

- **Buy it if:** Your current balancer is visibly damaged, you notice excessive vibration, or you re performing a major engine rebuild. The extra cost is a small price for peace of mind and longevity.

- **Skip it if:** The balancer appears structurally sound (though slightly worn is normal), and you re on a tight budget. In that case, a carefully inspected used OEM balancer could be a cost-effective alternative though not as durable.

- **Installation tip:** Have a mechanic verify the installation to ensure proper alignment and torque, as this is critical for performance.

For most owners, the **Powerbond/Dayco balancer is the best balance of quality, fitment, and reliability** for this application.

Details:

Dayco Engine Harmonic Balancer for 1987 Chevrolet V10 5.7L V8 Cylinder Block uu: Status: In Stock.

part #: sx1939 prices

  • $50.00-$260.50

specifications cranshafengin:

  • for makes: Chevrolet
  • for years: 1987
  • brand: Powerbond By Dayco
  • mpn: Sx-1939
  • item weight: 11.6700
  • ipn: C826 81-14
  • placement on vehicle: Engine Cylinder Block
  • compatible model: V10
  • core charge: Free No Core Charge
  • type: Engine Harmonic Balancer
  • fitment type: Direct Replacement
  • bundle description: 1 Pc Genuine Dayco Engine Harmonic Balancer

seller cranshafengin:

  • rating: 99.6%
  • # reviews: 638717
  • city: Indianapolis, Indiana

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general cranshafengin:

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

offer cranshafengin:

  • availability: In Stock
  • options: Ship-to-home
  • quantity: 2
  • started: March 29, 2026
  • sold: 0

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for makes: chevrolet, for years: 1987, item weight: 11.6700, placement on vehicle: engine cylinder block, compatible model: v10, core charge: free no core charge, type: engine harmonic balancer, fitment type: direct replacement, bundle description: 1 pc genuine dayco engine harmonic balancer,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19564451639948603,
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