1. Pistons, Rings, Rods & Parts Engines Components For Sale
  2. sku: 12801636322162722
  3. TRW PB670-TRW

TRW PB670-TRW Bushings Cylinders 8-PIN G39 L39 L37 L38

fits make: Oldsmobile. year: 1934–1948.

Pb670-trw Trw 8-pin Bushings 1934-1948 Oldsmobile 6 And 8 Cylinders G39 L39 L37 L38 Oem# 399078

( Brand: Trw ), ( Manufacturer Part Number: PB670-TRW ), ( Type: Wrist Pin Bushing ), ( Oe/oem Part Number: 399078 Oldsmobile / Gmc ), ( Items Included: 8-wrist Pin Bushings ), ( Material: Bronze ), ( Vintage Part: Yes ), ( Country Of Origin: United States ), ( Performance Part: No )

Review TRW 8-pin Bushings Oldsmobile And Cylinders G39 L39 L37 L38 Oem# fits 1934–1948

The **TRW PB670 8-pin cylinder bushings** are meticulously engineered replacement components designed specifically for the iconic **1934 1948 Oldsmobile engines**, including the legendary **G39, L39, L37, and L38 inline-six powerplants**. These bushings are a critical part of the cylinder head assembly, providing essential support and alignment for the valve springs and rocker arms while ensuring smooth, precise valve operation. Crafted from high-quality **heat-treated steel**, these bushings are precision-machined to exacting tolerances to match the original specifications, guaranteeing a seamless fit and reliable performance. The **8-pin design** ensures secure installation, preventing rotation or shifting under the high-stress conditions of engine operation, which is particularly important in vintage engines where wear and misalignment can lead to premature failure or inefficient combustion. Whether restoring a classic Oldsmobile for show or returning it to peak driving condition, these bushings eliminate the risk of valve spring binding, excessive noise, or valve train wear, thereby extending the engine s lifespan and maintaining its original power and responsiveness. Ideal for both professional mechanics and dedicated enthusiasts, the TRW PB670 bushings are a direct-fit, OEM-quality solution that restores factory-like reliability to these historic engines, ensuring they run with the same precision and character they were designed for over eight decades ago.

### Pros and Cons of Buying TRW PB670 (8-Pin) Bushings for 1934 1948 Oldsmobile Cylinders (G39, L39, L37, L38)

#### **Pros:**

1. **Compatibility and Fit:** TRW bushings are widely recognized for their precision engineering and compatibility with classic Oldsmobile engines, particularly the G-series and L-series models from the 1930s and early 1940s. These bushings are designed to fit the specific dimensions of the crankshaft and connecting rod journals, reducing clearance and minimizing wear.

2. **Durability and Performance:** The PB670 bushings are made from high-quality materials, often featuring a bronze or steel backing with a wear-resistant overlay. This construction enhances durability, reduces friction, and improves engine longevity, especially in high-mileage or restored engines where original components may be worn.

3. **Ease of Installation:** TRW bushings are designed for straightforward installation, often requiring minimal machining or modification to the engine block or crankshaft. They come pre-packed with lubricant, simplifying the fitting process compared to machining new bores or installing custom bearings.

4. **Cost-Effective Upgrade:** Compared to full engine rebuilds or custom machining, replacing bushings is a relatively inexpensive solution to address wear in critical engine components. This makes it an attractive option for restorers or enthusiasts on a budget who want to preserve the originality of their engine while improving performance.

5. **Reduced Oil Consumption:** Worn bushings can lead to oil leakage and increased oil consumption. Replacing them with TRW PB670 bushings can seal better, reducing oil leaks and improving engine efficiency.

6. **Compatibility with Aftermarket Parts:** These bushings are often used alongside other aftermarket components (e.g., crankshafts, rods, or pistons), making them a versatile choice for engines undergoing partial or full restorations.

7. **Warranty and Reliability:** TRW is a reputable manufacturer with a history of producing high-quality automotive parts. Their bushings typically come with warranties, providing peace of mind for buyers.

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#### **Cons:**

1. **Limited Availability:** While TRW parts are widely available, specific bushings like the PB670 for older Oldsmobile engines may not be as commonly stocked as more modern or high-demand parts. This could require ordering from specialty suppliers or waiting for delivery.

2. **Potential for Over-Machining:** If the engine block or crankshaft journals are already significantly worn, the bushings may not fully restore the original tolerances. In extreme cases, additional machining or the use of oversized bushings may be necessary, adding complexity and cost.

3. **Cost Relative to New Engines:** For engines in very poor condition, replacing bushings alone may not be sufficient to achieve reliable performance. In such cases, the cost of bushings might seem disproportionate compared to the cost of a rebuilt or replacement engine.

4. **Installation Skill Required:** While TRW bushings are designed for ease of installation, improper handling (e.g., cross-threading, improper seating, or incorrect lubrication) can lead to premature failure. This requires careful attention during installation, which may not be feasible for inexperienced DIYers.

5. **Compatibility with Original Components:** If the engine has been heavily modified or if other components (e.g., rods, pistons, or crankshafts) are non-standard, the bushings may not align perfectly with the intended specifications. This could lead to clearance issues or reduced performance.

6. **Environmental and Handling Considerations:** Bushings are delicate and can be damaged by moisture, dirt, or improper storage. If not handled correctly, they may become unusable before installation, requiring replacements and additional costs.

7. **Long-Term Cost vs. Rebuilding:** For engines with extensive internal wear (e.g., cracked blocks, bent rods, or worn crankshafts), replacing bushings is a temporary fix. Over time, the cost of repeated bushing replacements may outweigh the cost of a full engine rebuild or replacement.

---

### **Conclusion:**

TRW PB670 bushings are an excellent choice for restoring or maintaining the reliability of 1934 1948 Oldsmobile engines (G39, L39, L37, L38) with worn crankshaft or connecting rod journals. They offer a balance of compatibility, durability, and cost-effectiveness, making them ideal for restorers who want to preserve the original character of their engines while improving performance. However, they are not a universal solution engines with severe internal damage may require more comprehensive repairs.

For engines in good condition but with minor wear, these bushings are a practical and efficient upgrade. For engines with extensive damage, they serve as a valuable intermediate step before considering a full rebuild. Always ensure proper installation and compatibility with other components to maximize their benefits.

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### **Recommendation:** - **Buy the TRW PB670 bushings if:**

- Your engine has noticeable wear in the crankshaft or connecting rod journals but is otherwise structurally sound.

- You are restoring an engine and want to improve reliability without sacrificing originality.

- You are working on a budget and prefer a cost-effective solution over a full rebuild.

- You have access to proper tools and experience for installation, or you are willing to seek professional help.

- **Avoid or reconsider if:**

- The engine block or crankshaft has significant cracks, bends, or excessive wear that cannot be addressed by bushing replacement alone.

- You are unsure about the condition of other internal components (e.g., rods, pistons, or bearings), as these may need attention simultaneously.

- You lack the skills or tools to install the bushings correctly, as improper installation can lead to failure.

For best results, pair the bushing replacement with a thorough inspection of the engine s condition. If in doubt, consult a trusted mechanic or engine specialist to assess whether this upgrade is sufficient for your project s goals.

Details:

SET OF 8 PIN BUSHINGS FOR 1937-1948 OLDSMOBILE AND GMC TRUCK ENGINES.

part #: pb670 price

  • $80.00

specifications pistonrinro:

  • for makes: Oldsmobile
  • for years: 1934-1948
  • brand: Trw
  • mpn: Pb670-trw
  • type: Wrist Pin Bushing
  • oe/oem part number: 399078 Oldsmobile / Gmc
  • items included: 8-wrist Pin Bushings
  • material: Bronze
  • vintage part: Yes
  • country of origin: United States
  • performance part: No

general pistonrinro:

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

offer pistonrinro:

  • best offers: True
  • quantity: 1
  • availability: In Stock
  • sold: 0
  • started: March 17, 2026
  • options: Ship-to-home

returns pistonrinro:

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

payments pistonrinro:

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

shipping pistonrinro:

  • service: USPS Ground Advantage, USPS Priority Mail
  • cost: $9.80
  • carrier: USPS
  • transit: 2-6 Days
  • class: Standard, Expedited
  • type: Calculated

seller pistonrinro:

  • rating: 100.0%
  • # reviews: 678
  • city: Wadena, Minnesota
for makes: oldsmobile, for years: 1934-1948, type: wrist pin bushing, oe/oem part number: 399078 oldsmobile / gmc, items included: 8-wrist pin bushings, vintage part: yes, country of origin: united states, performance part: no,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, material: bronze, sku: 12801636322162722,
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1 offer $80.00 USD
  • New. Offer #1 priced at $80.00 + $10.60 shipping estimate = $90.60* total. WILL NEED TO BE FITTED TO YOUR WRIST PINS THEY WILL FIT ANY OF THE FOLLOW ENGINES IN ANY PLATFORM.+$10.60 shipping

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