GM 397859 Nos Connecting Rod Bolt Set

( Brand: Gm ), ( Manufacturer Part Number: 397859 ), ( Type: Connecting Rod Bolt ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review GM Nos Oem Olds Connecting Rod Bolt Set Of fits 2016

The **GM 397859 NOS Olds Connecting Rod Bolt Set (16-piece)** represents a meticulously preserved, high-performance component designed specifically for vintage Oldsmobile engines, particularly those featuring the iconic **L-series, Rocket V8, or other high-output configurations** from the mid-20th century. This **new-old-stock (NOS) bolt set** is crafted from **high-strength, heat-treated alloy steel**, ensuring exceptional durability and resistance to fatigue, vibration, and the extreme stresses encountered in high-revving, high-compression applications. Each bolt in this set is **precision-machined** to exacting specifications, maintaining the original **thread pitch, shank diameter, and head geometry** required for a proper, interference-fit installation critical for maintaining engine integrity under heavy loads. The bolts feature **fine, uniform threading** and a **smooth, polished finish**, reducing the risk of galling or seizing during assembly or disassembly, a common issue with aftermarket or reused fasteners. This set is particularly well-suited for **restoration projects, high-performance builds, or engine swaps** where authenticity and reliability are paramount, as it eliminates the need for compromised or mismatched fasteners that could compromise structural integrity. Whether used in a **stock-restored engine** or a **modified powerplant**, these bolts provide the **tight, consistent clamping force** necessary to keep connecting rods securely aligned with the crankshaft, preventing catastrophic failure under peak loads. The **original packaging** (when available) often includes a **GM-approved part number sticker**, further verifying its authenticity and ensuring compatibility with factory specifications. For enthusiasts seeking **uncompromising quality and historical accuracy**, this NOS bolt set is an indispensable component for achieving peak performance while preserving the engine s original character.

### **Pros and Cons of Buying GM 397859 NOS Olds Connecting Rod Bolt Set (16-Piece)**

1. **New Old Stock (NOS) Quality** The bolts are sourced from original, unused inventory, meaning they are free from wear, corrosion, or damage that could compromise engine integrity. This ensures they meet or exceed OEM specifications.

2. **Direct Fitment** Designed specifically for GM engines (likely V8 applications like the Oldsmobile 350/400/455 or similar), these bolts are engineered to match the original hardware, reducing the risk of improper fitment issues.

3. **High-Strength Material** GM s original bolts are typically made from high-grade steel or alloy, treated for strength and resistance to fatigue, which is critical for high-performance or heavy-duty applications.

4. **Prevents Bolt Failure** Connecting rod bolts are under extreme stress during engine operation. Using original or high-quality replacements reduces the risk of catastrophic failure, which can destroy an engine.

5. **Compatibility with Aftermarket Parts** If you re upgrading components (e.g., forged rods, high-performance pistons, or turbocharging), NOS bolts ensure proper torque specifications are met, maintaining safety and performance.

6. **Long-Term Reliability** Since these bolts are unused, they offer the same reliability as new OEM parts without the risk of counterfeit or substandard aftermarket alternatives.

7. **Ease of Installation** The bolts come pre-packaged and labeled, making installation straightforward compared to sourcing individual bolts or mismatched sets.

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1. **Limited Availability** NOS parts can be harder to find than new or aftermarket alternatives, especially for older GM engines. This may require patience or searching through specialty suppliers.

2. **Higher Cost** NOS parts are generally more expensive than aftermarket equivalents due to their original condition and direct sourcing from inventory. For budget-conscious buyers, this could be a significant drawback.

3. **Potential for Overkill** If the engine is lightly used or not subjected to extreme stress (e.g., street-driven sedans), these bolts may be more robust than necessary, making them a less cost-effective choice for basic maintenance.

4. **No Warranty (Typically)** NOS parts are often sold "as-is," meaning there s no manufacturer warranty or return policy. If the bolts fail prematurely, you re responsible for replacement costs.

5. **Storage and Handling Risks** Since these are old stock, there s a slight risk of corrosion or contamination if the packaging isn t pristine. Inspecting the bolts upon receipt is essential to ensure they re in good condition.

6. **Not Always Necessary for Minor Repairs** If the bolts are only being replaced due to routine maintenance or minor wear (e.g., rusted but structurally sound), aftermarket bolts that meet or exceed GM specs may suffice at a lower cost.

7. **Lead Times** Depending on the supplier, ordering NOS parts may involve longer shipping times compared to mass-produced aftermarket alternatives.

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The **GM 397859 NOS Olds connecting rod bolt set** is an excellent choice if you prioritize **reliability, original specifications, and long-term engine protection**, especially for high-performance, modified, or heavily stressed engines. The benefits of using genuine, unused hardware outweigh the drawbacks for applications where safety and durability are critical.

However, if you re working on a **budget-friendly project, lightly used engine, or don t require OEM precision**, aftermarket bolts that meet or exceed GM s torque and material standards (e.g., ARP, Fel-Pro, or reputable brands like AC Delco) may offer a more cost-effective solution without sacrificing quality.

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- You re rebuilding or modifying a high-performance engine (e.g., turbocharged, supercharged, or high-RPM applications).

- You value original equipment quality and want to avoid risks associated with aftermarket alternatives.

- The engine is subjected to extreme stress (e.g., racing, towing, or heavy-duty use).

- You have the budget and can justify the premium for peace of mind.

- The engine is for a mild street application with no performance modifications.

- You re looking to save money while still using high-quality bolts (e.g., ARP 915 or similar).

- You can t find the NOS set quickly or are willing to compromise slightly on originality.

For most **street-driven or lightly modified engines**, aftermarket bolts that meet or exceed GM s specifications are a practical and cost-effective choice. However, for **serious performance builds or critical repairs**, the NOS set is the safest and most reliable option. Always follow GM s torque specifications (typically **100 120 ft-lbs for these bolts**) and use a torque wrench to prevent overtightening.

Details:

Shipped with USPS Ground Advantage. NOS OEM GM OLDS Connecting Rod Bolt Set of 16 397859. Condition is New. Bolt is 3/8 x 24 2.09.

part #: 397859 price

• $48.00

specifications pistonrinro:

• for makes: Olds
• for years: 2016
• brand: Gm
• mpn: 397859
• type: Connecting Rod Bolt
• vintage part: Yes
• country of origin: United States

shipping pistonrinro:

• class: Standard
• cost: $10.95
• service: USPS Ground Advantage
• type: Calculated
• carrier: USPS
• transit: 2-5 Days

payments pistonrinro:

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

returns pistonrinro:

• policy: No Returns

seller pistonrinro:

• rating: 100.0%
• # reviews: 970
• city: Homer Glen, Illinois

offer pistonrinro:

• availability: In Stock
• quantity: 2
• started: June 1, 2026
• sold: 0
• options: Ship-to-home

general pistonrinro:

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

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