POWERBOND BY DAYCO SX-5603 Engine Harmonic Balancer Cylinder PB200 5.9L V8 Ag

( Brand: Powerbond By Dayco ), ( Manufacturer Part Number: SX-5603 ), ( Item Weight: 8.3800 ), ( Ipn: C640 42-19 ), ( Placement On Vehicle: Engine Cylinder Block ), ( Compatible Model: Pb200 ), ( Compatible Year: 1980 1979 1978 1977 1976 1975 ), ( 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: 2.540 In / 64.50 Mm ), ( Hardware Included: No ), ( Ring Width: 1.182 In / 30.00 Mm ), ( Counterweight Balance: Ring Weighted ), ( Outer Ring Material: Cast Iron ), ( Overall Outside Diameter: 7.099 In / 180.30 Mm ), ( Nose Outside Diameter: 2.188 In / 55.55 Mm ), ( Crank Bore: 1.531 In / 38.88 Mm )

Review POWERBOND BY DAYCO Engine Harmonic Balancer Plymouth 5.9l V8 Cylinder Ag fits 1975–1980

The **Powerbond Dayco SX-5603 Engine Harmonic Balancer** is a high-performance, precision-engineered replacement part designed specifically for the iconic 1975 through 1980 Plymouth PB200, equipped with the legendary 5.9L (350 cubic inch) V8 engine featuring the AG (A-body) cylinder block configuration. This robust harmonic balancer is crafted to deliver superior vibration control, enhanced durability, and improved drivability, making it an essential upgrade for both classic car enthusiasts and performance-minded owners seeking to restore or enhance the reliability of their beloved muscle cars. Engineered with a durable rubber compound, the SX-5603 is engineered to withstand the demanding stresses of high-performance applications, reducing engine shake, minimizing wear on critical components like the crankshaft and timing system, and ensuring a smoother, more refined ride. The balancer s precision-machined steel hub and robust mounting flange are designed to maintain perfect alignment with the crankshaft, preventing misalignment-related issues that can lead to premature failure of the timing belt or chain. Whether you're preparing your PB200 for a weekend cruise, a classic car show, or a spirited track session, this harmonic balancer provides the confidence of knowing your engine is operating at its best, free from the irritating vibrations and potential damage associated with worn or failing stock components. Built to exceed OEM standards, the Powerbond Dayco SX-5603 is a testament to modern engineering, offering a seamless blend of performance and longevity that restores the integrity of your engine s power delivery while preserving the timeless character of your classic Plymouth.

### **Pros and Cons of Buying a Powerbond Dayco SX-5603 Engine Harmonic Balancer for a 1975 1980 Plymouth PB200 5.9L V8 (A/B Cylinder Head)**

1. **Compatibility** The Powerbond Dayco SX-5603 is specifically designed for the 5.9L V8 engines found in the 1975 1980 Plymouth PB200 (and similar Dodge and Chrysler applications). It is a direct replacement for the original harmonic balancer, ensuring proper fitment without modifications.

2. **Durability and Performance** Powerbond and Dayco are well-regarded manufacturers for high-quality engine components. Their harmonic balancers are built to withstand the stresses of a high-performance or heavily driven engine, reducing vibration and improving drivability.

3. **Reduced Vibration and Smooth Operation** A worn or failing harmonic balancer can cause excessive vibration, which can lead to drivability issues, premature wear on related components (such as the crankshaft pulley and mounts), and even damage to the engine bay. A new harmonic balancer helps maintain smooth operation, especially under load.

4. **Prevents Catastrophic Failure** The harmonic balancer absorbs torsional vibrations from the crankshaft. If it fails, it can lead to severe engine damage, including cracked pulleys, bent rods, or even a broken crankshaft. Replacing it proactively avoids costly repairs.

5. **Ease of Installation** The SX-5603 is designed for straightforward installation, requiring only basic tools. Most mechanics or experienced DIYers can replace it without special equipment.

6. **Cost-Effective Maintenance** Compared to the potential cost of repairing engine damage caused by a failing harmonic balancer, replacing it as a preventive measure is relatively inexpensive.

7. **Warranty Coverage** Both Powerbond and Dayco offer warranties on their harmonic balancers, providing peace of mind against premature failure.

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1. **Cost** While not excessively expensive, a harmonic balancer is still an additional expense. For a 1975 1980 PB200, labor costs for installation (if not doing it yourself) may add to the total expense. Expect to pay between **$50 $100 for the part** and **$100 $200 in labor**, depending on the shop s rates.

2. **Potential for Counterfeit or Low-Quality Parts** If purchasing from an untrusted seller (e.g., eBay, Facebook Marketplace, or unknown online retailers), there is a risk of receiving a counterfeit or substandard harmonic balancer. Always buy from reputable suppliers (e.g., RockAuto, Summit Racing, or authorized dealers) to ensure authenticity.

3. **Additional Maintenance Considerations** If the harmonic balancer is being replaced as part of a larger overhaul (e.g., timing belt, water pump, or serpentine belt system), it may be more cost-effective to address those components simultaneously. However, if the balancer is the only failing part, this is not a major drawback.

4. **Installation Complexity (If DIY)** While the part itself is straightforward, accessing the harmonic balancer on a 5.9L V8 may require removing the serpentine belt, pulleys, and possibly the alternator or power steering pump. This can be time-consuming for inexperienced DIYers, especially if the engine bay is cramped or rusted.

5. **Limited Lifespan (If Not High-Quality)** While Powerbond and Dayco balancers are durable, they are not indestructible. In extreme conditions (e.g., severe towing, high-performance modifications, or neglect), they may still fail prematurely. Regular inspection is recommended.

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The **Powerbond Dayco SX-5603 harmonic balancer is a strong, reliable choice** for a 1975 1980 Plymouth PB200 5.9L V8. The benefits reduced vibration, improved drivability, and prevention of costly engine damage far outweigh the minor drawbacks, particularly if purchased from a trusted source and installed properly. The part is a **direct replacement with proven durability**, making it a sound investment for maintaining or restoring engine health.

If the balancer is visibly cracked, leaking, or causing excessive vibration, **replacing it is a wise preventive measure**. However, if the engine is otherwise in good condition and the balancer appears fine, the replacement may not be urgent but it is still a recommended part of routine maintenance for high-mileage or performance applications.

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- **Buy from a reputable supplier** (e.g., RockAuto, Summit Racing, or a local auto parts store with a return policy) to ensure authenticity.

- **Consider DIY installation** if comfortable with basic engine work, as labor costs can add up. If not, have a trusted mechanic perform the replacement.

- **Inspect the surrounding components** (serpentine belt, pulleys, mounts) while the balancer is removed replace any worn parts to avoid future issues.

- **Replace the harmonic balancer as part of a larger overhaul** (e.g., timing belt service) if possible to maximize efficiency and reduce downtime.

- **Monitor for signs of wear** (cracks, oil leaks, excessive vibration) during regular maintenance checks, and replace it proactively if needed.

**Final Verdict:** The **Powerbond Dayco SX-5603 is a recommended upgrade** for the 1975 1980 PB200 5.9L V8, offering long-term reliability and peace of mind.

Details:

Dayco Engine Harmonic Balancer for 1975 1980 Plymouth PB200 5.9L V8 Cylinder ag: Status: In Stock.

part #: sx5603 prices

• $139.58-$232.11

specifications cranshafengin:

• for makes: Plymouth
• for years: 1975-1980
• brand: Powerbond By Dayco
• mpn: Sx-5603
• item weight: 8.3800
• ipn: C640 42-19
• placement on vehicle: Engine Cylinder Block
• compatible model: Pb200
• compatible year: 1980 1979 1978 1977 1976 1975
• 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: 2.540 In / 64.50 Mm
• hardware included: No
• ring width: 1.182 In / 30.00 Mm
• counterweight balance: Ring Weighted
• outer ring material: Cast Iron
• overall outside diameter: 7.099 In / 180.30 Mm
• nose outside diameter: 2.188 In / 55.55 Mm
• crank bore: 1.531 In / 38.88 Mm

offer cranshafengin:

• options: Ship-to-home
• quantity: 4
• started: March 8, 2026
• sold: 0
• availability: In Stock

payments cranshafengin:

• wallet: Paypal
• other
• credit card: Discover

general cranshafengin:

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

seller cranshafengin:

• # reviews: 630259
• city: Indianapolis, Indiana
• rating: 99.5%

shipping cranshafengin:

• class: Standard, Expedited
• type: Fixed
• cost: $0.00
• service: Standard, Expedited
• transit: 3-5 Days

returns cranshafengin:

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

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