1. Pistons, Rings, Rods & Parts Engines Components For Sale
  2. sku: 13227011935288603
  3. MANLEY 42039-4

MANLEY 42039-4 Wrist Pin Bushing 807298114545

42039-4 Manley Wrist Pin Bushing

( Brand: Manley ), ( Manufacturer Part Number: 42039-4 ), ( Part Type: Pin Bushing ), ( Return Notes: New, Unused Condition W/original Packaging ), ( UPC: 807298114545 )

Review MANLEY Wrist Pin Bushing

The **Manley 42039-4 Wrist Pin Bushing** is a precision-engineered component designed to ensure smooth, reliable operation within high-performance engine applications, particularly in small-block Chevrolet engines and similar high-revving powerplants. Crafted from high-quality **steel-backed, bronze-lined material**, this bushing is engineered to withstand the extreme stresses of high RPMs, intense heat, and heavy loads, making it an indispensable upgrade for enthusiasts seeking enhanced durability and performance. The bushing features a **tight interference fit** with the connecting rod, providing optimal stability while minimizing wear on both the wrist pin and rod bearings, thereby extending the lifespan of critical engine components. Its **smooth, low-friction bronze lining** reduces metal-to-metal contact, minimizing friction and heat buildup critical factors in maintaining consistent power delivery and preventing premature failure in aggressive driving conditions. Whether installed in a stock engine undergoing a rebuild or a heavily modified high-performance setup, this bushing delivers a balance of strength and wear resistance, ensuring reliable operation under demanding circumstances. Built to exacting standards, the **Manley 42039-4** is a trusted choice for mechanics and racers who demand nothing less than peak performance from their engine components.

### **Pros and Cons of buying a Manley 42039-4 Wrist Pin Bushing**

#### **Pros:**

1. **High-Quality Material** Manley is known for using durable materials, including hardened steel or bronze, which can withstand high stress and wear in engine applications. This bushing is designed to reduce friction and prevent premature wear on wrist pins.

2. **Precision Engineering** The part is likely machined to tight tolerances, ensuring a proper fit in the engine block or connecting rod. This helps maintain optimal alignment and performance, reducing the risk of binding or excessive play.

3. **Compatibility with Common Engines** The 42039-4 model is designed for specific applications (likely small-block Chevrolet or similar engines). If you have a compatible engine, this bushing can be a direct replacement for worn or damaged stock parts.

4. **Extended Engine Life** A well-fitted wrist pin bushing reduces stress on the wrist pin and connecting rod bearings, potentially increasing the lifespan of these components. This can be particularly beneficial in high-performance or heavily modified engines.

5. **Easy Installation** Since it s a standard replacement part, installation typically requires basic tools (socket wrench, hammer, and possibly a press) and does not require specialized skills. Many aftermarket bushings come with installation instructions.

6. **Cost-Effective for Repairs** Compared to rebuilding an entire engine or replacing a connecting rod, a wrist pin bushing is relatively inexpensive. This makes it a practical solution for minor wear or damage.

7. **Aftermarket Support** Manley is a reputable brand with a history of producing reliable engine components. Their products are widely available through performance parts retailers, making sourcing and replacement easier.

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#### **Cons:**

1. **Potential for Improper Fit** If the engine block or connecting rod has been modified (e.g., oversized pistons, custom rods, or worn bores), the Manley bushing may not fit perfectly. Improper fit can lead to binding, excessive wear, or even failure under load.

2. **Limited Durability in Extreme Conditions** While high-quality, these bushings are not indestructible. In extreme high-performance applications (e.g., forced induction, extreme boost, or high-RPM racing), the bushing may wear out faster than stock components, requiring more frequent replacement.

3. **No Guarantee Against Pre-Existing Damage** If the connecting rod or wrist pin is already damaged (e.g., bent, cracked, or worn), replacing just the bushing will not fix the underlying issue. This could lead to catastrophic failure if the problem is not addressed.

4. **Installation Risks** If not installed correctly (e.g., improper seating, cross-threading, or damage during removal), the bushing may not function as intended. This could result in premature failure or increased friction.

5. **Compatibility Issues** Not all engines use the same wrist pin bushing size. Double-checking the part number and application is critical. Installing the wrong bushing can cause misalignment, binding, or damage to the wrist pin or rod.

6. **Cost Compared to Stock Parts** While aftermarket bushings are often cheaper than OEM replacements, they may still be more expensive than a simple rebuild kit if the engine is already in poor condition. In some cases, rebuilding the rod or block may be more cost-effective long-term.

7. **Limited Warranty or Return Policy** Some aftermarket parts come with minimal warranties or no return policy. If the bushing fails prematurely due to manufacturing defects, you may be out of luck without proof of purchase or additional documentation.

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### **Conclusion:**

The **Manley 42039-4 Wrist Pin Bushing** is a solid aftermarket replacement option for engines requiring a durable, precision-machined component. It offers improved reliability over worn stock bushings and is a cost-effective solution for minor repairs. However, its effectiveness depends on proper installation, compatibility with your engine, and the overall condition of the surrounding components (wrist pin, connecting rod, and block).

If your engine is in good condition and the bushing is the only failing part, this is a **recommended choice** for restoring performance and preventing further damage. However, if the connecting rod or wrist pin is compromised, a **full rod rebuild or replacement** may be necessary to ensure long-term reliability.

### **Recommendation:** - **Buy the Manley 42039-4 if:**

- You ve confirmed it matches your engine s application.

- The connecting rod and wrist pin are in good condition.

- You re performing a routine maintenance or minor repair.

- You re comfortable with basic engine disassembly and reassembly.

- **Avoid or reconsider if:**

- The engine has been heavily modified or the rod/wrist pin is damaged.

- You re unsure about the exact fit or compatibility.

- You re working on a high-performance build where extreme stress will be applied (consider a more robust solution like a custom rod or reinforced bushing).

- You don t have access to proper tools or experience for installation.

For maximum safety, **consult a mechanic or engine specialist** if you re unsure about the condition of your engine or the correct installation procedure.

Details:

Manley Wrist Pin Bushing designed for durability and consistent lubrication, these bushings help reduce friction wear while maintaining proper pin alignment under demanding operating conditions. Ideal for both street and race applications. Items must be New, Unused, Not Installed, in the Original Packaging and able to resold. Premium AMPCO 18 material.

Brand: Manley. MPN: 42039-4. Condition: New. Manufacturer: Manley.

Domestic Shipping: The shipping cost on this listing or the Free Shipping is for lower 48 States.

part #: 420394 prices

  • $49.00-$65.89

specifications pistonrinro:

  • brand: Manley
  • mpn: 42039-4
  • part type: Pin Bushing
  • return notes: New, Unused Condition W/original Packaging
  • upc: 807298114545

general pistonrinro:

  • Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts
  • condition: New

seller pistonrinro:

  • # reviews: 176258
  • city: Grant, Michigan
  • rating: 99.4%

returns pistonrinro:

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

payments pistonrinro:

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

shipping pistonrinro:

  • class: Expedited
  • transit: 2-5 Days
  • service: Expedited
  • cost: $12.99
  • type: Fixed

offer pistonrinro:

  • options: Ship-to-home
  • started: April 15, 2026
  • sold: 0
  • quantity: 1
  • availability: In Stock
part type: pin bushing, return notes: new, unused condition w/original packaging,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, sku: 13227011935288603,
Manley 42039-4 Is Similar To:
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3 offers $49.00–$65.89 USD
  • New. Offer #1 priced at $49.00 + $12.99 shipping estimate = $61.99* total. Premium AMPCO 18 material . Manley Wrist Pin Bushing Designed for durability and consistent lubrication, these bushings help reduce friction and wear while maintaining proper pin alignment under demanding operating conditions.+$12.99 shipping
  • New. Offer #2 priced at $61.54 + $0.00 shipping estimate = $61.54* total. Manley Wrist Pin Bushing, BUSHING-PIN. Manufacturer: Manley Performance.FREE SHIPPING
  • New. Offer #3 priced at $65.89 + $0.00 shipping estimate = $65.89* total. The vendor part number is .FREE SHIPPING

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