1. Engine Crankshafts Products
  2. sku: 19123767276417721
  3. POWERBOND DAYCO SX-0617

POWERBOND BY DAYCO SX-0617 Engine Harmonic Balancer 6.5L 6.6L

fits model: C20, Hf. make: Chevrolet. year: 1968–1971.

Sx-0617 Powerbond By Dayco Engine Harmonic Balancer For 1968-1971 Chevrolet C20 Pickup 6.5l 6.6l Hf

( Brand: Powerbond By Dayco ), ( Manufacturer Part Number: SX-0617 ), ( Item Weight: 10.0700 ), ( Ipn: C716 40-66 ), ( Placement On Vehicle: Engine Cylinder Block ), ( Compatible Model: C20 Pickup ), ( Compatible Year: 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: 2.686 In / 68.20 Mm ), ( Hardware Included: No ), ( Ring Width: 1.378 In / 34.98 Mm ), ( Counterweight Balance: Neutral, No Counterweight ), ( Outer Ring Material: Steel ), ( Overall Outside Diameter: 6.979 In / 177.25 Mm ), ( Nose Outside Diameter: 2.333 In / 59.25 Mm ), ( Crank Bore: 1.599 In / 40.60 Mm )

Review POWERBOND BY DAYCO Engine Harmonic Balancer Chevrolet Pickup 6.5l 6.6l fits C20 HF 1968–1971

The **Powerbond Dayco SX-0617 Engine Harmonic Balancer** is a high-performance, precision-engineered replacement part designed specifically for the robust **1968 1971 Chevrolet C20** trucks equipped with the legendary **6.5L (396 CID) and 6.6L (402 CID) Heavy Duty (HF) V8 engines**. This balancer is a direct drop-in replacement for the stock unit, ensuring seamless integration with the crankshaft and flywheel assembly while delivering superior vibration damping and longevity compared to aftermarket alternatives. Crafted from **high-strength steel** and reinforced with **Dayco s proprietary SX (Super X) rubber compound**, this balancer is engineered to withstand the extreme torque and RPM demands of the HF engine, reducing harmful vibrations that can lead to drivetrain wear, bearing stress, and premature failure of related components. The **precision-balanced design** minimizes torsional vibrations, enhancing engine smoothness and contributing to a more refined driving experience, particularly under heavy loads or at higher speeds. Ideal for both restoration projects and high-mileage trucks, the SX-0617 is built to endure the rigors of daily towing, hauling, or off-road use, making it a trusted choice for enthusiasts seeking reliability without sacrificing performance. Whether restoring a classic C20 to its original glory or upgrading an existing engine for modern demands, this harmonic balancer combines **durability, precision, and compatibility** to ensure optimal engine operation for years to come.

**Pros and Cons of Buying a Powerbond Dayco SX-0617 Engine Harmonic Balancer for a 1968 1971 Chevrolet C20 (6.5L/6.6L HF Diesel)**

### **Pros:**

1. **Compatibility and Fitment** The SX-0617 is specifically designed for the 6.5L/6.6L inline-six diesel engine used in the C20 series trucks from 1968 to 1971. It is a direct replacement for the OEM harmonic balancer, ensuring proper alignment and function without modifications.

2. **Durability and Performance** Powerbond and Dayco are reputable manufacturers known for producing high-quality harmonic balancers. These balancers are designed to reduce engine vibration, smooth out crankshaft movement, and reduce wear on related components like the flywheel and transmission.

3. **Reliability Over Time** The 6.5L/6.6L diesel engines in these trucks are known for longevity, but harmonic balancers can wear out or crack over time, especially if the engine has high mileage or has been subjected to rough use. Replacing it with a new, robust balancer can prevent unexpected failures and further damage.

4. **Ease of Installation** The SX-0617 is a straightforward bolt-on replacement. No special tools or modifications are required beyond standard engine removal procedures, making it accessible for DIYers with basic mechanical skills.

5. **Preventative Maintenance** Replacing a worn or failing harmonic balancer as part of routine maintenance can prevent more costly repairs down the line, such as damage to the flywheel, crankshaft, or transmission mounts.

6. **Warranty Coverage** Both Powerbond and Dayco offer warranties on their harmonic balancers, providing some assurance against defects in materials or workmanship.

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### **Cons:**

1. **Cost** While not excessively expensive, the SX-0617 is a specialized part, and the price may be higher than generic or aftermarket alternatives. For a project truck, this could be a minor consideration, but for a daily driver, it may be seen as an unnecessary expense if the balancer is still functional.

2. **Limited Availability** Depending on the region, finding this specific part may require ordering online, which could involve shipping delays. Local auto parts stores may not stock it, requiring a trip to a specialty supplier.

3. **Potential for Counterfeit Parts** As with any aftermarket part, there is a risk of purchasing a counterfeit or low-quality replica, especially if buying from untrusted sellers. Always verify the seller s reputation and check for authenticity markings.

4. **Installation Challenges** While the installation itself is simple, removing the old balancer may require some effort, particularly if it is seized or corroded. In rare cases, this could lead to additional labor costs if professional help is needed.

5. **Mixed Reviews on Longevity** Some owners report that aftermarket harmonic balancers, even from reputable brands, may not last as long as the OEM part. However, this varies widely depending on engine condition, driving habits, and maintenance.

6. **No Significant Performance Gain** Unlike some performance parts, replacing the harmonic balancer does not improve engine power or fuel efficiency. It is purely a maintenance or reliability upgrade.

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### **Conclusion:**

The Powerbond Dayco SX-0617 harmonic balancer is a sound investment for owners of a 1968 1971 Chevrolet C20 with a 6.5L/6.6L diesel engine, particularly if the original balancer is worn, cracked, or showing signs of failure. The benefits of reduced vibration, improved reliability, and preventative maintenance outweigh the minor drawbacks, such as cost and potential availability issues. For those who prioritize longevity and smooth operation of their diesel truck, this is a worthwhile upgrade.

If the original balancer is still in good condition and the engine is running smoothly, the replacement may not be urgent. However, if you are performing other maintenance or notice symptoms of a failing balancer (such as rattling, vibration, or visible cracks), replacing it with the SX-0617 is a practical choice.

### **Recommendation:** **Purchase the Powerbond Dayco SX-0617 harmonic balancer if:**

- Your current balancer is damaged, worn, or showing signs of failure.

- You are performing routine maintenance or an engine rebuild.

- You want to ensure smooth operation and prevent potential damage to other engine components.

- You trust reputable suppliers to avoid counterfeit parts.

**Avoid purchasing it if:**

- Your balancer is still functioning properly and there are no signs of wear.

- You are on a tight budget and other maintenance priorities take precedence.

- You are unable to verify the authenticity of the part from your supplier.

For most owners of these classic diesel trucks, the SX-0617 is a reliable and recommended choice for maintaining engine health and performance.

Details:

Dayco Engine Harmonic Balancer for 1968-1971 Chevrolet C20 Pickup 6.5L 6.6L Hf: Status: In Stock.

specifications cranshafengin:

  • for models: C20, Hf
  • for makes: Chevrolet
  • for years: 1968-1971
  • brand: Powerbond By Dayco
  • mpn: Sx-0617
  • item weight: 10.0700
  • ipn: C716 40-66
  • placement on vehicle: Engine Cylinder Block
  • compatible model: C20 Pickup
  • compatible year: 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: 2.686 In / 68.20 Mm
  • hardware included: No
  • ring width: 1.378 In / 34.98 Mm
  • counterweight balance: Neutral, No Counterweight
  • outer ring material: Steel
  • overall outside diameter: 6.979 In / 177.25 Mm
  • nose outside diameter: 2.333 In / 59.25 Mm
  • crank bore: 1.599 In / 40.60 Mm

shipping cranshafengin:

  • cost: $0.00
  • type: Fixed
  • class: Standard, Expedited
  • service: Standard, Expedited
  • transit: 3-7 Days

general cranshafengin:

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

payments cranshafengin:

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

offer cranshafengin:

  • sold: 0
  • availability: In Stock
  • quantity: 1
  • options: Ship-to-home
  • started: March 2, 2026

returns cranshafengin:

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

seller cranshafengin:

  • # reviews: 627832
  • city: Indianapolis, Indiana
  • rating: 99.5%
for models: c20, hf, for makes: chevrolet, for years: 1968-1971, item weight: 10.0700, placement on vehicle: engine cylinder block, compatible model: c20 pickup, compatible year: 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: 2.686 in / 68.20 mm, hardware included: no, ring width: 1.378 in / 34.98 mm, counterweight balance: neutral, no counterweight, outer ring material: steel, overall outside diameter: 6.979 in / 177.25 mm, nose outside diameter: 2.333 in / 59.25 mm, crank bore: 1.599 in / 40.60 mm,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19123767276417721,
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