1. Engine Crankshafts Products
  2. sku: 20563937023186762
  3. AUTODAYPLUS ADP104964J23

AUTODAYPLUS ADP104964J23 Harmonic Balancer Bel Air 594-012 V8 5.7L

fits model: 350ci, Caprice. make: Chevy. year: 1969–1975.

Adp104964j23 Autodayplus Harmonic Balancer 594-012 For Chevy Bel-air Caprice V8 5.7l 1969-1975 350ci New

( Brand: Autodayplus ), ( Manufacturer Part Number: ADP104964J23 ), ( Part Type: Balancer ), ( Crank Bore: Mm ), ( Ring Width In : 30.18 ), ( Oe/oem Part Number: 594-012 ), ( Bundle Description: Harmonic Balancer Crankshaft Pulley ), ( Vintage Part: No ), ( Performance Part: Yes ), ( Package Included: As Picctures Shown ), ( Weight: About 9 Lb ), ( Connector Color: Black ), ( Fitment Type: Direct Replacement )

Review AUTODAYPLUS Harmonic Balancer Chevy Bel air V8 5.7l New fits CAPRICE 350CI 1969–1975

The **AutodayPlus ADP104964J23 Harmonic Balancer (Part #594-012)** is a high-performance, precision-engineered component designed specifically for the iconic **Chevy Bel Air and Caprice V8 engines** with the legendary **5.7L (350ci) small-block architecture** spanning the model years **1969 through 1975**. This harmonic balancer is meticulously crafted to replace the stock unit, offering superior durability, reduced vibration, and enhanced reliability critical for maintaining optimal performance in high-revving, high-torque applications. Built from **high-grade steel** and featuring a **balanced, counterweighted design**, this balancer effectively dampens engine harmonics, minimizing unwanted noise and wear on the crankshaft and related drivetrain components. Its robust construction ensures it can withstand the demands of aggressive driving, heavy loads, and prolonged high-RPM operation, making it an ideal upgrade for both street machines and classic muscle cars seeking to preserve their originality while gaining modern reliability. The ADP104964J23 is a direct-fit replacement, ensuring compatibility with the **350ci V8 s** harmonic balancer mounting interface, and is backed by AutodayPlus s commitment to quality, offering a seamless integration with aftermarket and OEM accessories. Whether restoring a vintage Bel Air to its former glory or fine-tuning a Caprice for track use, this harmonic balancer delivers the precision and strength needed to keep the engine running smoothly while extending the lifespan of the drivetrain.

**Pros and Cons of buying a AutodayPlus ADP104964J23 Harmonic Balancer (594-012) for a 1969 1975 Chevy Bel Air/Caprice 350ci V8**

### **Pros:**

1. **Direct Fitment** The balancer is specifically listed as a direct replacement for the 350ci V8 engines in your Chevy models (1969 1975), reducing the risk of compatibility issues.

2. **High-Quality Material** AutodayPlus products are generally made from durable materials like steel or reinforced composites, designed to withstand the stresses of a high-performance or heavily driven engine.

3. **Reduces Vibration** A properly functioning harmonic balancer dampens engine vibrations, improving drivability and reducing wear on the crankshaft and related components.

4. **Prevents Crankshaft Damage** A failing balancer can cause excessive crankshaft movement, leading to catastrophic engine failure. Replacing it proactively can extend engine life.

5. **Aftermarket Support** AutodayPlus is a reputable brand with available customer service and return policies, which can be helpful if the part arrives damaged or is incompatible.

6. **Cost-Effective Alternative** Compared to OEM parts, this aftermarket balancer is often more affordable, making it a practical choice for budget-conscious restorers or DIY mechanics.

7. **Ease of Installation** The design is straightforward, and with basic tools, it can be swapped out without major disassembly (though some engine work may still be required).

### **Cons:**

1. **Potential Quality Variations** While AutodayPlus is a known brand, aftermarket parts can sometimes vary in quality compared to OEM components. Some users report premature wear or failure if the part isn t properly matched to the engine s demands.

2. **No Warranty on Installation Issues** The balancer itself may come with a limited warranty, but if installation is improper (e.g., not properly balanced or secured), it could fail quickly. This requires careful handling during fitment.

3. **May Not Match Original Specs Perfectly** Some aftermarket balancers use slightly different materials or designs to reduce cost, which might not replicate the exact damping characteristics of the original GM part.

4. **Risk of Counterfeit Parts** There is a possibility of receiving a knockoff or low-quality duplicate, especially if purchasing from unverified sellers. Always buy from trusted retailers with return policies.

5. **Additional Labor Costs** If you re not experienced with engine work, removing and reinstalling the balancer may require disassembling parts of the engine or drivetrain, adding time and potential complexity.

6. **Limited Longevity Claims** Unlike OEM parts, aftermarket balancers may not have the same lifespan guarantees, especially under extreme conditions (e.g., high-performance tuning, heavy towing, or aggressive driving).

### **Conclusion:**

The **AutodayPlus ADP104964J23 harmonic balancer** is a **practical and cost-effective choice** for your 1969 1975 Chevy 350ci V8, offering direct fitment and decent durability for everyday driving or light restoration projects. It s particularly suitable if you re working on a budget or prefer aftermarket parts for their affordability. However, if you re restoring a high-performance or show car where longevity and precision are critical, you may want to consider an **OEM replacement or a higher-end aftermarket balancer** (e.g., from brands like **Crane, Moroso, or JE**) for potentially better performance and reliability.

### **Recommendation:**

- **Buy from a reputable dealer** (e.g., RockAuto, Summit Racing, or a trusted local parts store) to avoid counterfeit or low-quality parts.

- **Inspect the balancer upon arrival** for defects or damage, and request a replacement if necessary.

- **Follow proper installation procedures**, ensuring the balancer is securely bolted and properly aligned with the crankshaft pulley.

- **Consider pairing it with a new crankshaft pulley** (if the original is worn) for a complete refresh.

- **Monitor for symptoms of failure** (excessive vibration, rattling, or a loose pulley) during the first few thousand miles to ensure it s functioning as expected.

If your engine is heavily modified or subjected to high stress, weigh the pros and cons carefully sometimes investing in a slightly pricier but higher-quality balancer is worth the extra cost for long-term reliability. For most stock-to-moderately-modified 350ci engines, this part will serve well.

Details:

Engine Harmonic Balancer. Condition: New. Package Quantity: Brand: Autodayplus.

Harmonic Balancer 594-012 For Chevy Bel-Air Caprice V8 5.7L 1969-1975 350CI New. Warranty: 1 Year. Fitment Type: Direct Replacement. New List Item.

part #: adp104964j23 prices

  • $39.98-$45.99

specifications cranshafengin:

  • for models: 350ci, Caprice
  • for makes: Chevy
  • for years: 1969-1975
  • brand: Autodayplus
  • mpn: Adp104964j23
  • part type: Balancer
  • crank bore: Mm
  • ring width in : 30.18
  • oe/oem part number: 594-012
  • bundle description: Harmonic Balancer Crankshaft Pulley
  • vintage part: No
  • performance part: Yes
  • package included: As Picctures Shown
  • weight: About 9 Lb
  • connector color: Black
  • fitment type: Direct Replacement

shipping cranshafengin:

  • type: Fixed
  • carrier: FedEx
  • transit: 4-10 Days
  • cost: $0.00
  • class: Economy
  • service: FedEx Ground Economy

returns cranshafengin:

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

general cranshafengin:

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

payments cranshafengin:

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

offer cranshafengin:

  • options: Ship-to-home
  • best offers: True
  • sold: 0
  • availability: In Stock
  • started: May 26, 2026

seller cranshafengin:

  • rating: 99.8%
  • # reviews: 326365
  • city: Ontario, California
for models: 350ci, caprice, for makes: chevy, for years: 1969-1975, part type: balancer, crank bore: mm, ring width in: 30.18, oe/oem part number: 594-012, bundle description: harmonic balancer crankshaft pulley, vintage part: no, performance part: yes, package included: as picctures shown, connector color: black, fitment type: direct replacement,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, weight: about 9 lb, sku: 20563937023186762,
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