1. Engine Crankshafts Products
  2. sku: 19663696314197721
  3. POWERBOND DAYCO SX-1246

POWERBOND BY DAYCO SX-1246 Engine Harmonic Balancer 5.0L

fits model: K10, Mx, Suburban. make: Chevrolet. year: 1968–1973.

Sx-1246 Powerbond By Dayco Engine Harmonic Balancer For 1968-1973 Chevrolet K10 Suburban 5.0l Mx

( Brand: Powerbond By Dayco ), ( Manufacturer Part Number: SX-1246 ), ( Item Weight: 4.8500 ), ( Ipn: C382 60-40 ), ( Placement On Vehicle: Engine Cylinder Block ), ( Compatible Model: K10 Suburban ), ( Compatible Year: 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 )

Review POWERBOND BY DAYCO Engine Harmonic Balancer Chevrolet 5.0l fits SUBURBAN K10 MX 1968–1973

The **Powerbond Dayco SX-1246 Engine Harmonic Balancer** is a high-performance, precision-engineered replacement part designed specifically for the **1968 1973 Chevrolet K10 Suburban** equipped with the legendary **5.0L (305 cubic inch) Small Block V8 (SBC) engine**, commonly referred to as the "MX" or "High Output" variant. This aftermarket harmonic balancer is meticulously crafted to restore and enhance the smooth operation of your engine s crankshaft, mitigating the harsh vibrations and torsional stress that can plague stock components over time. Built with **high-quality rubber compounds** and reinforced steel construction, the SX-1246 is engineered to deliver superior durability and longevity compared to OEM parts, which are notorious for cracking, warping, or failing prematurely especially under heavy loads, towing, or high-performance applications. The balancer s **precision-machined flange** ensures a perfect fit with the crankshaft, while its **robust mounting system** minimizes flex and resonance, reducing engine noise and preventing damage to critical components like the timing chain, oil pump, and accessory drives. Whether you re restoring a classic K10 Suburban for daily driving, preparing it for weekend cruising, or pushing it in a street rod or light-duty towing scenario, this harmonic balancer provides the **quiet, vibration-dampening performance** needed to keep your engine running like new. Backed by **Dayco s reputation for reliability**, this part is a smart investment for anyone looking to eliminate the telltale "clunk" of a failing balancer and enjoy a smoother, more refined power delivery from your iconic 305 SBC.

### Pros and Cons of Buying a Powerbond Dayco SX-1246 Engine Harmonic Balancer for a 1968 1973 Chevrolet K10 Suburban (5.0L Small Block)

#### **Pros:**

1. **Compatibility and Fitment** The SX-1246 is specifically designed for the 5.0L Small Block Chevrolet engine (L34, L48, L49, etc.), ensuring a proper fit without modifications. It aligns with the crankshaft and flywheel housing dimensions of the K10 Suburban s engine bay.

2. **Durability and Quality** Powerbond and Dayco are well-regarded manufacturers for harmonic balancers, known for using high-quality materials (e.g., steel and rubber compounds) that resist cracking, warping, and premature wear. The SX-1246 is built to handle the torque and vibrations of the 5.0L engine under normal driving conditions.

3. **Reduced Vibration and Smooth Operation** A worn or failing harmonic balancer can cause excessive vibration, which may lead to driveline issues (e.g., loose driveshafts, transmission wear) or even damage to the engine mounts. A new SX-1246 absorbs engine harmonics effectively, improving ride comfort and protecting connected components.

4. **Prevents Catastrophic Failure** Unlike a cracked or broken balancer (which can send debris into the engine or damage the flywheel), a fresh SX-1246 eliminates this risk. It s a straightforward, low-cost preventive measure compared to potential engine damage.

5. **Ease of Installation** The SX-1246 is a direct replacement with standard bolts (typically 10mm or 12mm, depending on the year). No special tools or modifications are required, and installation is manageable for a DIYer with basic mechanical experience.

6. **Cost-Effective Upgrade** Compared to rebuilding or replacing the entire engine, a harmonic balancer is inexpensive (typically $50 $100 depending on the source). It s a small investment with significant long-term benefits.

7. **Compatibility with Aftermarket Mods** If you plan to add performance parts (e.g., headers, turbocharging, or forced induction), a high-quality balancer like the SX-1246 is a wise choice to handle increased stress.

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#### **Cons:**

1. **Potential for Counterfeit or Low-Quality Units** While Powerbond and Dayco are reputable, counterfeit or poorly made knockoffs exist in the aftermarket. Always purchase from a trusted source (e.g., RockAuto, Summit Racing, or a local auto parts store with a return policy) to avoid receiving a substandard balancer.

2. **Limited Lifespan Under Extreme Conditions** While the SX-1246 is durable, it is not indestructible. Under extreme conditions (e.g., high RPMs, forced induction, or severe off-roading), the rubber compound may degrade faster than in stock applications. In such cases, a reinforced or performance-oriented balancer (e.g., a two-piece or high-torque model) may be preferable.

3. **Installation Challenges for Inexperienced Mechanics** While straightforward, removing the old balancer requires careful handling of the crankshaft pulley (which may be seized or rusted). If the engine has been neglected, the bolts or housing may be difficult to remove, requiring penetrating oil or a puller.

4. **No Performance Gain** Unlike some aftermarket parts, a harmonic balancer does not improve horsepower or torque. It solely serves to dampen vibration and prevent failure. If you re seeking performance upgrades, this part alone won t deliver them.

5. **Risk of Over-Tightening Bolts** The balancer bolts must be torqued to specification (typically 60 70 ft-lbs for the SX-1246). Over-tightening can strip threads or damage the crankshaft pulley, while under-tightening may lead to loosening over time.

6. **Not a Permanent Fix for Underlying Issues** If the engine has other problems (e.g., worn mounts, a bent crankshaft, or excessive vibration from the driveline), replacing the balancer alone won t resolve them. A full diagnostic may be needed for a smooth-running vehicle.

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### **Conclusion:**

The **Powerbond Dayco SX-1246 harmonic balancer is an excellent choice** for a 1968 1973 Chevrolet K10 Suburban with a 5.0L engine. It offers a reliable, cost-effective solution to prevent vibration-related issues, reduce wear on connected components, and avoid the risk of a catastrophic failure. The pros far outweigh the cons, provided you source the part from a reputable supplier and perform the installation correctly.

**Recommendation:**

- **Buy the SX-1246** if your balancer is cracked, worn, or showing signs of failure (e.g., excessive vibration, visible cracks, or a loose fit).

- **Verify compatibility** with your specific engine (confirm it s an L34/L48/L49 5.0L by checking the engine code stamped on the valve cover).

- **Purchase from a trusted dealer** (e.g., RockAuto, Summit Racing, or a local parts store with a return policy) to avoid counterfeit units.

- **Follow torque specifications** when installing to ensure a secure but not overtightened fit.

- **Consider a performance balancer** (e.g., a two-piece or high-torque model) if you plan to modify the engine significantly (e.g., forced induction, high RPMs, or off-roading).

For most stock or lightly modified K10 Suburans, the SX-1246 is a **smart, low-risk upgrade** that extends the life of your engine and improves drivability.

Details:

Dayco Engine Harmonic Balancer for 1968-1973 Chevrolet K10 Suburban 5.0L Mx: Status: In Stock.

specifications cranshafengin:

  • for models: K10, Mx, Suburban
  • for makes: Chevrolet
  • for years: 1968-1973
  • brand: Powerbond By Dayco
  • mpn: Sx-1246
  • item weight: 4.8500
  • ipn: C382 60-40
  • placement on vehicle: Engine Cylinder Block
  • compatible model: K10 Suburban
  • compatible year: 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

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seller cranshafengin:

  • # reviews: 641093
  • city: Indianapolis, Indiana
  • rating: 99.6%

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

general cranshafengin:

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

offer cranshafengin:

  • options: Ship-to-home
  • sold: 0
  • availability: In Stock
  • started: April 4, 2026
  • quantity: 2

returns cranshafengin:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller
for models: k10, mx, suburban, for makes: chevrolet, for years: 1968-1973, item weight: 4.8500, placement on vehicle: engine cylinder block, compatible model: k10 suburban, compatible year: 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,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19663696314197721,
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