BOP RMS18 Rear Seal

( Brand: Bop ), ( Manufacturer Part Number: RMS18 ), ( Part Type: Seal ), ( Country Of Origin: United States )

Review BOP One Piece Rear Main Seal Pontiac Inch

The **RMS18 Rear Seal Kit for Pontiac V8 Engines** is a meticulously engineered, high-performance upgrade designed to address one of the most common and frustrating issues in classic and modern Pontiac V8 applications the chronic failure of the rear main seal. Crafted with precision for engines ranging from the iconic **389, 400, 455, and 428 Hemi** to the legendary **LS1, LS2, and LS3** found in muscle cars, trucks, and performance cruisers, this kit ensures a robust, leak-free seal that withstands the demands of high RPMs, aggressive driving, and prolonged use. Engineered from **high-grade nitrile rubber with a reinforced steel backing plate**, the RMS18 seal is built to endure extreme temperatures, oil pressure fluctuations, and the relentless vibrations inherent in high-performance applications. Unlike generic aftermarket seals that often fail prematurely due to poor material quality or improper fitment, the RMS18 incorporates a **precision-machined aluminum housing** that guarantees a perfect seal with the crankshaft, eliminating the risk of oil leaks that can destroy bearings, contaminate transmission fluid, or ruin engine bay cleanliness. This kit is particularly well-suited for **high-mileage engines, drag racing applications, or daily drivers modified for serious power**, where the rear main seal is subjected to relentless stress. Installation is straightforward, requiring only basic tools, and the kit includes **all necessary gaskets, bolts, and a comprehensive installation guide** to ensure a professional finish. Whether restoring a vintage Pontiac GTO, preparing a 455 for a street rod build, or upgrading a modern LS-based truck, the RMS18 Rear Seal Kit is the definitive solution for eliminating rear main seal failures and extending the life of your engine. Built to last, this kit is a testament to modern engineering s ability to solve age-old mechanical challenges with durability and reliability.

### Pros and Cons of Buying a Pontiac RMS18 Rear Seal (1968-1970 GTO)

1. **Classic Muscle Car Heritage** The RMS18 rear seal is iconic, associated with the legendary 1968-1970 Pontiac GTO, one of the most sought-after muscle cars of the era. Owning one connects you to a storied automotive legacy.

2. **High Performance Potential** The GTO was powered by the legendary 389 or 400 cubic inch V8 engines, which are known for their raw power and durability when properly maintained. With the right modifications, these engines can still deliver impressive performance.

3. **Strong Community and Support** The GTO community is passionate and well-organized, with aftermarket parts, restoration resources, and events dedicated to these cars. This makes finding help, parts, and fellow enthusiasts relatively easy.

4. **Timeless Design** The GTO s aggressive, mid-60s muscle car styling remains iconic. Its long hood, short deck, and distinctive grille give it a timeless appeal that continues to attract admirers.

5. **Investment Potential** Well-preserved or restored GTOs, especially those with original RMS18 rear seals, can appreciate in value over time, particularly if they are rare or historically significant models.

6. **Driving Experience** For enthusiasts, the raw, unfiltered driving experience of a stock or lightly modified GTO is unmatched. The engine noise, power delivery, and handling make it a thrilling car to drive.

7. **Customization Opportunities** The GTO platform is highly customizable, allowing for engine swaps, suspension upgrades, and body modifications to suit individual tastes.

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1. **High Maintenance Costs** Older muscle cars like the GTO require significant upkeep. Rust, worn suspension components, and aging electrical systems are common issues that can be costly to repair.

2. **Reliability Concerns** While the engines are powerful, they are not as refined as modern counterparts. Issues like oil leaks, valve train wear, and transmission problems can arise, especially if the car has not been well-maintained.

3. **Fuel and Insurance Costs** Modern fuel prices and insurance premiums for classic cars can be prohibitive, especially for high-performance or rare models. Insurance for a GTO may be expensive due to its value and potential for high-speed accidents.

4. **Parts Availability and Cost** While parts for the GTO are widely available, some rare or aftermarket components can be expensive. Replicas and modern reproductions may not always match the quality or authenticity of original parts.

5. **Driving Challenges** Older muscle cars lack modern safety features like stability control, airbags, and advanced braking systems. Driving a GTO requires skill and caution, particularly on highways or in heavy traffic.

6. **Storage and Transportation** Classic cars often require specialized storage to protect them from the elements. Transporting one can also be costly, especially if it is not road-legal or requires a trailer.

7. **Time-Consuming Restoration** If you purchase a project car, restoring it to original or showroom condition can take years of work. This requires patience, mechanical skill, and a significant investment of time and money.

8. **Depreciation Risk** Unlike some classic cars that appreciate in value, GTOs (especially common models) may not hold their value as well if they are not well-preserved or lack historical significance.

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Buying a Pontiac GTO with an RMS18 rear seal is a dream for many automotive enthusiasts, offering a blend of nostalgia, performance, and cultural significance. However, it comes with substantial challenges, including high maintenance costs, reliability issues, and the need for significant time and financial investment to keep it in good condition. The decision to purchase one should be based on your passion for classic cars, your willingness to invest in its upkeep, and your ability to balance the joys of ownership with the practical realities of maintaining such a vehicle.

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1. **Choose Wisely Between Project and Ready-to-Drive** If you are new to classic car ownership, consider buying a car that is already in good condition or requires only minor work. A fully restored or well-maintained GTO will allow you to enjoy the car without the stress of a major restoration project.

2. **Prioritize Rust-Free Examples** Rust is one of the biggest enemies of older muscle cars. Inspect the car thoroughly for rust in critical areas like the frame, subframe, and suspension components. A rust-free GTO will save you thousands in repair costs over time.

3. **Focus on Engine and Transmission Health** The heart of the GTO is its engine. Ensure that the engine is in good condition, with no major leaks, excessive wear, or performance issues. The transmission should also be reliable, ideally with a manual or a well-maintained automatic.

4. **Budget for Maintenance and Upkeep** Classic car ownership is not cheap. Budget for regular maintenance, potential repairs, and unexpected issues. Consider joining a classic car club or forum to learn from experienced owners and access resources.

5. **Consider Insurance and Storage** Classic car insurance can be expensive, so factor this into your budget. Additionally, secure a reliable storage solution to protect your investment from the elements.

6. **Enjoy the Journey** Owning a GTO is as much about the experience as it is about the car itself. Whether you drive it occasionally, show it at car meets, or simply admire it in your garage, the joy of owning a piece of automotive history is unparalleled.

In summary, if you are passionate about classic cars and willing to invest the time and money required to maintain one, a Pontiac GTO with an RMS18 rear seal can be an incredibly rewarding purchase. However, if you are not prepared for the challenges, it may be better to start with a more modern or lower-maintenance classic car.

Details:

I bought this ONE PIECE seal meaning to buy the two piece and didn't realize it until was too late return Butler. 301 326 350 389 4 1959-1981, THIS IS AONE PIECE SEAL. Just want someone to be able use it and get a little bit of deal.

part #: rms18 prices

• $64.99-$81.99

specifications cranshafengin:

• for makes: Pontiac
• brand: Bop
• mpn: Rms18
• part type: Seal
• country of origin: United States

shipping cranshafengin:

• transit: 3-8 Days
• service: UPS Ground
• class: Standard
• cost: $0.00
• type: Fixed
• carrier: UPS

payments cranshafengin:

• other
• wallet: Paypal
• credit card: Visa

offer cranshafengin:

• best offers: True
• availability: In Stock
• quantity: 1
• options: Ship-to-home
• started: June 9, 2026
• sold: 0

seller cranshafengin:

• rating: 100.0%
• # reviews: 577
• city: Mocksville, North Carolina

general cranshafengin:

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

returns cranshafengin:

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