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  3. GM 1336218

GM 1336218 Nos Rocker Extension Plate 4DR

fits model: Roadmaster. make: Buick. year: 1946–1948.

1336218 Gm 1946-1948 Buick Super Roadmaster 4dr Nos Rocker Extension Plate

( Brand: Gm ), ( Manufacturer Part Number: 1336218 ), ( Part Type: Plate ), ( Manufacturer Warranty: No ), ( Vintage Part: Yes ), ( Finish: Stainless Steel ), ( Placement On Vehicle: Rear, Right ), ( Country Of Origin: United States )

Review GM Buick Super 4dr Nos Rocker Extension Plate fits ROADMASTER 1946–1948

The **GM 1336218 OEM Rocker Extension Plate for a 1946-1948 Buick Roadmaster 4-Door Sedan** is a meticulously crafted, high-quality reproduction part designed to restore authenticity and structural integrity to one of America s most iconic post-war automobiles. This essential component, originally manufactured by General Motors for the 1946 through 1948 Buick Roadmaster series, serves as a critical link between the rocker panels and the lower body rails, ensuring proper alignment, rigidity, and a seamless fitment. Crafted from heavy-duty cold-rolled steel, the plate is precision-machined to match the exact dimensions and contours of the original, including the subtle curves and reinforcement ribs that were standard in GM s factory construction. Its robust construction not only reinforces the body s structural integrity but also helps prevent rust infiltration at a common weak point where the rocker panels meet the lower sills. Whether restoring a classic Roadmaster to showroom condition or maintaining a daily-driven vintage cruiser, this rocker extension plate is an indispensable part for enthusiasts seeking both mechanical reliability and period-correct aesthetics. The part is fully compatible with the 1946-1948 Buick Roadmaster 4-door sedan, including variations like the Series 60 and Series 65 models, and is designed to fit seamlessly with other OEM-style aftermarket components, ensuring a flawless integration with the vehicle s original body structure. For collectors and restorers who demand nothing less than factory precision, this reproduction part bridges the gap between modern fabrication techniques and the uncompromising standards of GM s golden era of automotive engineering.

### **Pros and Cons of Buying a 1946 1948 Buick Roadmaster (GM 1336218) with a NOS Rocker Extension Plate**

#### **Pros**

1. **Classic American Design and Prestige**

The 1946 1948 Buick Roadmaster is a highly sought-after example of mid-century American automotive craftsmanship. Its distinctive styling, including the iconic "flying buttress" grille, chrome detailing, and spacious bodywork, makes it a standout vehicle. Owning one provides a sense of prestige and nostalgia, appealing to enthusiasts who appreciate vintage automobiles.

2. **Strong Engine and Performance Potential**

The Roadmaster was powered by Buick s straight-8 engine (initially the 320 cu in in 1946, later the 331 cu in in 1947 1948), known for its smooth operation, durability, and good power output for its time. With proper maintenance, these engines can last for decades, especially if restored or kept in running condition. The vehicle s weight and drivetrain (originally a three-speed manual or two-speed automatic) allow for enjoyable driving dynamics, particularly when modified or restored.

3. **Reliability of Original Components**

The NOS (New Old Stock) rocker extension plate is a rare and desirable part, indicating that the engine or transmission may have been preserved in excellent condition. NOS parts are highly valued because they are original, unused, and often in mint condition, which can simplify restoration efforts. This reduces the need for aftermarket replacements, saving time and money in the long run.

4. **Investment Potential**

Classic Buicks, especially well-preserved examples, can appreciate in value over time. The Roadmaster, in particular, is a popular model among collectors, and a fully restored or even a well-maintained original can be a sound investment. The NOS rocker extension plate further enhances its collectibility, as such parts are increasingly difficult to find in pristine condition.

5. **Customization and Restoration Opportunities**

The Roadmaster s platform offers ample room for customization, whether you aim for a period-correct restoration or a modernized build. Options include swapping in a more powerful engine (such as a later-model Buick straight-8 or even a modern V8), upgrading the suspension, or modifying the interior for comfort. The vehicle s size also makes it suitable for conversion projects, such as a mobile home or a unique show car.

6. **Community and Enthusiast Support**

Buick enthusiasts and classic car clubs (such as the Buick Club of America) provide a wealth of knowledge, parts, and camaraderie. Owning a Roadmaster connects you to a passionate community that can offer guidance on restoration, maintenance, and even event participation (e.g., car shows, cruises, and rallies).

7. **Driving Experience**

For those who enjoy the tactile feel of a vintage car, the Roadmaster offers a different driving experience compared to modern vehicles. The manual transmission (if retained), the solid-body construction, and the responsive steering provide a more engaged and immersive driving experience. Many owners appreciate the challenge and satisfaction of operating a vehicle from an era with different engineering priorities.

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#### **Cons**

1. **High Cost of Acquisition and Restoration**

A 1946 1948 Buick Roadmaster, especially one with NOS parts like the rocker extension plate, can be expensive. Prices for well-preserved examples often range from $30,000 to over $100,000, depending on condition, rarity, and provenance. Restoration costs can also be prohibitive, as original parts may require sourcing from specialty suppliers or custom fabrication. Labor and materials for bodywork, electrical systems, and mechanical components can add up quickly.

2. **Complexity of Restoration**

Restoring a classic Buick is a labor-intensive process. The vehicle s solid-body construction, chrome-heavy exterior, and intricate interior details require skilled craftsmanship. Common issues include rust (particularly in the floor pans, rocker panels, and fenders), worn suspension components, and outdated electrical systems. The NOS rocker extension plate is a positive, but other engine components (such as valves, camshafts, or gaskets) may still need replacement or refurbishment.

3. **Maintenance and Parts Availability**

While Buick parts are more accessible than those for some other vintage brands, finding original or high-quality aftermarket parts can still be challenging. The straight-8 engine, while robust, requires regular maintenance such as valve adjustments, timing chain inspection, and carburetor tuning. Modern replacements for components like starters, alternators, or fuel pumps may not be exact fits, requiring modifications or upgrades.

4. **Operational Challenges**

Original Buicks were not built with modern convenience in mind. Issues such as poor heating systems, unreliable electrical wiring, and outdated braking systems (e.g., drum brakes with minimal stopping power) can be frustrating. Driving in extreme weather or on long trips may also be less comfortable or safe without modifications. The lack of modern safety features (e.g., airbags, modern seatbelts) is another consideration.

5. **Insurance and Storage Costs**

Classic cars often come with higher insurance premiums due to their value and potential for theft or damage. Storage fees for a vehicle that may not be driven daily can also add up, especially if you opt for climate-controlled or secure facilities. If the car is not restored, it may require more frequent maintenance to prevent deterioration.

6. **Time Commitment**

Owning a classic car is not just a financial investment but also a time commitment. Whether you re restoring it yourself or hiring professionals, the project can take years to complete. Even a well-maintained original requires regular attention to keep it in running condition. For those with busy lifestyles, this may not be feasible.

7. **Market Volatility**

The classic car market can be unpredictable. Economic downturns, shifts in collector interest, or oversaturation of similar models can affect the Roadmaster s resale value. While Buicks have historically held their value well, there s always a risk that your investment may not appreciate as expected.

8. **Driving Limitations**

The Roadmaster s size (especially the four-door models) can make parking and maneuvering in modern urban environments difficult. Its weight and older suspension may also result in a less smooth ride compared to contemporary vehicles. For daily driving, the lack of modern amenities (e.g., power steering, cruise control, modern audio systems) can be a drawback.

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### **Conclusion**

Buying a 1946 1948 Buick Roadmaster with a NOS rocker extension plate is a significant decision that offers both rewards and challenges. On the positive side, you re acquiring a piece of automotive history with strong potential for appreciation, customization, and driving enjoyment. The NOS part alone adds substantial value and simplifies restoration efforts. The Roadmaster s classic design, robust engine, and enthusiast community make it an attractive project for those passionate about vintage automobiles.

However, the costs both financial and time-consuming cannot be underestimated. Restoration or even maintenance can be expensive and complex, and the vehicle may not be practical for daily use. Insurance, storage, and the ongoing commitment to preserving its condition are also factors to consider. If you re prepared for the challenges and have the resources to invest in its upkeep, the Roadmaster can be a deeply rewarding project. For those who prioritize convenience, modern reliability, or practicality, the cons may outweigh the pros.

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### **Recommendation**

**Proceed with caution and careful planning.** This purchase is best suited for:

- **Enthusiasts with deep pockets and patience** who are willing to invest time and money into restoration or maintenance.

- **Collectors or investors** who view the Roadmaster as a long-term project or asset, not a daily driver.

- **Owners who appreciate the process of working on a classic car** and enjoy the community and pride that comes with owning a well-preserved vintage vehicle.

**Avoid if:**

- You re looking for a practical, modern vehicle with low maintenance costs.

- You lack the budget for unexpected restoration expenses or storage fees.

- You re not prepared to commit to regular upkeep or the possibility of years-long projects.

**Next Steps:**

1. **Thoroughly inspect the vehicle** (or have a trusted mechanic do so) to assess its overall condition beyond the NOS rocker extension plate. Look for rust, engine wear, and mechanical soundness.

2. **Budget for restoration or maintenance** factor in labor, parts, and unexpected costs.

3. **Research the market** to understand the Roadmaster s current value and trends in the classic car community.

4. **Consider starting smaller** if this is your first classic car project. A less expensive model or a partially restored example could help you gain experience before tackling a high-value piece like this.

Ultimately, the Roadmaster is a fantastic choice for the right owner one who values craftsmanship, history, and the joy of working with their hands. For others, the costs and challenges may not justify the investment.

Details:

1946-1948 Buick Super Roadmaster 4dr NOS rocker extension plate 1336218: genuine GM panel cover plate, RH passenger side, part number 1336218.This fits 1946 - 1948 and Wagon. Brand new, still in original GM box, never installed. 1946 1947 1948. And I have to do the revising BEFORE you pay.

part #: 1336218 prices

  • $23.07-$24.99

specifications cartrimmouldings:

  • for models: Roadmaster
  • for makes: Buick
  • for years: 1946-1948
  • brand: Gm
  • mpn: 1336218
  • part type: Plate
  • manufacturer warranty: No
  • vintage part: Yes
  • finish: Stainless Steel
  • placement on vehicle: Rear, Right
  • country of origin: United States

seller cartrimmouldings:

  • city: Toledo, Ohio
  • # reviews: 19244
  • rating: 100.0%

general cartrimmouldings:

  • condition: Used
  • Car Truck Parts Accessories > Exterior Parts Accessories > Body Moldings Trims

returns cartrimmouldings:

  • policy: No Returns

payments cartrimmouldings:

  • credit card: Discover
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  • wallet: Paypal

shipping cartrimmouldings:

  • transit: 15-18 Days
  • service: USPS Ground Advantage
  • class: Standard
  • cost: $12.95
  • carrier: USPS
  • type: Calculated

offer cartrimmouldings:

  • options: Ship-to-home
  • quantity: 1
  • sold: 0
  • started: May 31, 2026
  • availability: In Stock
for models: roadmaster, for makes: buick, for years: 1946-1948, part type: plate, manufacturer warranty: no, vintage part: yes, finish: stainless steel, placement on vehicle: rear, right, country of origin: united states,
category: auto parts > car truck parts accessories > exterior parts accessories > body moldings trims, sku: 15843026426010893,
Gm 1336218 Is Similar To:
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2 offers $23.07–$24.99 USD
  • Used. Offer #1 priced at $24.99 + $12.95 shipping estimate = $37.94* total. And I have to do the revising.+$12.95 shipping
  • Neu. Offer #2 priced at $23.07 + $64.11 shipping estimate = $87.18* total. 90067111 / . Schlauchbogen unten Thermostatgeh use - K hler.+$64.11 shipping

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