1. Engine Crankshafts Products
  2. sku: 19694978515597721
  3. POWERBOND DAYCO SX-1140

POWERBOND BY DAYCO SX-1140 Engine Harmonic Balancer Van Xd 5.7L V8

fits make: Chevrolet. year: 1971–1974.

Sx-1140 Powerbond By Dayco Engine Harmonic Balancer For 1971-1974 Chevrolet G30 Van 5.7l V8 Xd

( Brand: Powerbond By Dayco ), ( Manufacturer Part Number: SX-1140 ), ( Item Weight: 11.6700 ), ( Ipn: C447 78-43 ), ( Placement On Vehicle: Engine Cylinder Block ), ( Compatible Model: G30 Van ), ( Compatible Year: 1974 1973 1972 1971 ), ( 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: 2.347 In / 59.60 Mm ), ( Hardware Included: No ), ( Ring Width: 1.523 In / 38.68 Mm ), ( Counterweight Balance: Neutral, No Counterweight ), ( Outer Ring Material: Steel ), ( Overall Outside Diameter: 7.953 In / 202.00 Mm ), ( Nose Outside Diameter: 1.762 In / 44.75 Mm ), ( Crank Bore: 1.245 In / 31.60 Mm )

Review POWERBOND BY DAYCO Engine Harmonic Balancer Chevrolet Van 5.7l V8 Xd fits G30 1971–1974

The **Powerbond Dayco SX-1140 Engine Harmonic Balancer** is a meticulously engineered, high-performance replacement part designed specifically for the **1971 1974 Chevrolet G30 Van** equipped with the legendary **5.7L (350 cubic inch) V8 XD engine**. This precision-crafted component is engineered to restore optimal vibration dampening, enhance drivability, and extend the longevity of your engine s critical rotating assembly. Built with **high-grade, heat-treated steel** and reinforced with a **multi-layered rubber insert**, the SX-1140 harmonic balancer delivers superior durability and resilience against the harsh demands of high-performance driving, towing, or heavy-duty applications. Unlike generic aftermarket alternatives, this balancer is **directly compatible** with the G30 s crankshaft configuration, ensuring a perfect fit and seamless integration with the engine s internal components. Its **robust construction** minimizes parasitic drag while effectively isolating engine vibrations, reducing wear on the crankshaft, rod bearings, and other critical parts. Whether you re restoring a classic G30 for weekend cruising or pushing it to its limits on the road or track, the Powerbond Dayco SX-1140 provides the **reliability and performance** needed to keep your engine running smoothly for years to come. Backed by Dayco s reputation for quality and Powerbond s commitment to durability, this harmonic balancer is an essential upgrade for any owner seeking to preserve the integrity of their Chevy s powerplant.

### **Pros and Cons of Buying a Powerbond Dayco SX-1140 Engine Harmonic Balancer for a 1971 1974 Chevrolet G30 Van (5.7L V8 XD)**

#### **Pros:**

The Powerbond/Dayco SX-1140 harmonic balancer is a well-regarded aftermarket replacement for the stock harmonic balancer on the **350 CID (5.7L) Chevrolet V8**, including the **XD engine** found in the G30 van. Here are the key advantages:

1. **Improved Durability** The stock harmonic balancer on the 350 V8 is known for wearing out prematurely, often due to rubber degradation or internal bearing failure. The SX-1140 features a **high-quality rubber compound** and a **steel-reinforced design**, which significantly extends its lifespan compared to the OEM part.

2. **Reduced Vibration & Smoothness** A worn harmonic balancer can cause excessive vibration, especially at higher RPMs. The SX-1140 is engineered to **dampen engine vibrations more effectively**, leading to a smoother drivetrain experience.

3. **Better Heat Resistance** The rubber compound in the SX-1140 is formulated to **withstand higher temperatures** better than the stock part, reducing the risk of cracking or hardening over time.

4. **Easier Installation** The SX-1140 is a **direct bolt-on replacement** with the same mounting pattern as the OEM balancer, making installation straightforward for most mechanics or DIYers.

5. **Compatibility** This balancer is specifically designed for the **350 CID V8 (including the XD variant)**, ensuring a proper fit without modification.

6. **Warranty & Reliability** Powerbond/Dayco is a reputable brand with a **strong reputation for quality**, and many users report **years of trouble-free service** from this balancer.

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#### **Cons:** While the SX-1140 is an excellent upgrade, there are a few potential drawbacks to consider:

1. **Cost** The SX-1140 is **more expensive than the OEM harmonic balancer** (typically ranging from **$80 $120**, depending on the seller). However, this is a **one-time investment** that pays off in longevity.

2. **Installation Requires Engine Removal (Partial)** Replacing the harmonic balancer on a 350 V8 usually requires **removing the serpentine belt, alternator, and possibly the water pump**, which can be labor-intensive. If you re not comfortable with engine work, this may necessitate a mechanic.

3. **Potential for Misalignment** If not installed correctly, the balancer could **throw off timing** or cause **excessive play**, leading to vibration issues. Proper alignment with the crankshaft is crucial.

4. **Limited Availability of OEM Parts** Since the SX-1140 is an aftermarket part, some classic car enthusiasts prefer **OEM or high-quality replica parts** for authenticity. However, the stock balancer is notoriously unreliable, making this a moot point for most owners.

5. **No Significant Performance Gain** Unlike some aftermarket engine components (e.g., headers, camshafts), the harmonic balancer does **not improve horsepower or torque**. Its purpose is **durability and smoothness**, not performance.

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### **Conclusion & Recommendation**

The **Powerbond/Dayco SX-1140 harmonic balancer is an excellent choice** for the **1971 1974 Chevrolet G30 van with a 5.7L (350 CID) V8 XD engine**. Here s why:

- **If you re experiencing vibration, a loose or worn balancer, or have had past issues with the stock part**, upgrading to the SX-1140 is a **wise preventive measure** that will **eliminate future problems** and extend the life of your engine.

- **If your balancer is still functioning fine**, there s no urgent need to replace it, but it s a **good practice for long-term reliability**, especially if you plan to keep the van for many years.

- **If you re restoring or modifying the engine**, this balancer is a **must-have** to ensure smooth operation and prevent unnecessary wear on the drivetrain.

**Final Recommendation:**

**Buy the Powerbond/Dayco SX-1140 harmonic balancer.** It is a **proven, high-quality upgrade** that offers **superior durability, vibration reduction, and peace of mind** compared to the stock part. While it requires some effort to install, the **long-term benefits far outweigh the cost and labor**. If you re not comfortable with engine work, consider having a trusted mechanic perform the installation.

Details:

Dayco Engine Harmonic Balancer for 1971-1974 Chevrolet G30 Van 5.7L V8 xd: Status: In Stock.

specifications cranshafengin:

  • for makes: Chevrolet
  • for years: 1971-1974
  • brand: Powerbond By Dayco
  • mpn: Sx-1140
  • item weight: 11.6700
  • ipn: C447 78-43
  • placement on vehicle: Engine Cylinder Block
  • compatible model: G30 Van
  • compatible year: 1974 1973 1972 1971
  • 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: 2.347 In / 59.60 Mm
  • hardware included: No
  • ring width: 1.523 In / 38.68 Mm
  • counterweight balance: Neutral, No Counterweight
  • outer ring material: Steel
  • overall outside diameter: 7.953 In / 202.00 Mm
  • nose outside diameter: 1.762 In / 44.75 Mm
  • crank bore: 1.245 In / 31.60 Mm

shipping cranshafengin:

  • service: Standard, Expedited
  • type: Fixed
  • transit: 2-5 Days
  • class: Standard, Expedited
  • cost: $0.00

payments cranshafengin:

  • wallet: Paypal
  • other
  • credit card: Visa

offer cranshafengin:

  • started: April 6, 2026
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock
  • quantity: 2

returns cranshafengin:

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

general cranshafengin:

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

seller cranshafengin:

  • rating: 99.6%
  • city: Indianapolis, Indiana
  • # reviews: 641630
for makes: chevrolet, for years: 1971-1974, item weight: 11.6700, placement on vehicle: engine cylinder block, compatible model: g30 van, compatible year: 1974 1973 1972 1971, 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: 2.347 in / 59.60 mm, hardware included: no, ring width: 1.523 in / 38.68 mm, counterweight balance: neutral, no counterweight, outer ring material: steel, overall outside diameter: 7.953 in / 202.00 mm, nose outside diameter: 1.762 in / 44.75 mm, crank bore: 1.245 in / 31.60 mm,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19694978515597721,
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