MOTORAD SX-7R57 Fuel Tank Gas Cap Iu 4.3L 5.7L V6 V8

( Brand: Motorad ), ( Manufacturer Part Number: SX-7R57 ), ( Type: Fuel Tank Cap ), ( Placement On Vehicle: Air Fuel Delivery Hardware Fasteners Fittings ), ( Item Width: 3.000 ), ( Item Length: 3.250 ), ( Manufacturer Warranty: 1 Year ), ( Ipn: C510 9-53 ), ( Compatible Year: 1985 1984 1983 1982 1981 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Motorad Fuel Tank Cap )

Review MOTORAD Fuel Tank Cap Buick 4.3l 5.7l V6 V8 Gas Iu fits CENTURY 1981–1985

The **Motorad SX-7R57 Fuel Tank Cap** is a meticulously crafted, high-performance replacement part designed specifically for the 1981 through 1985 Buick Century models equipped with either the 4.3L (V6) or 5.7L (V8) inline-six engines. Engineered to meet the exacting standards of modern fuel systems while maintaining full compatibility with the original vehicle s design, this fuel tank cap is built to enhance both functionality and aesthetics. Constructed from durable, corrosion-resistant materials, the cap features a robust, tamper-proof locking mechanism that ensures a secure seal, preventing fuel vapors from escaping while also deterring unauthorized access a critical feature for maintaining optimal engine performance and emissions compliance. The cap s sleek, matte black finish blends seamlessly with the vehicle s original trim, offering a polished look that complements the classic Buick styling. Beyond its practical benefits, the Motorad SX-7R57 is designed with precision engineering in mind, incorporating a reliable venting system that regulates internal pressure within the fuel tank, reducing the risk of vapor lock and fuel starvation during high-performance driving or extended periods of operation. Whether you re restoring a vintage Century to its former glory or upgrading an existing vehicle for improved reliability, this fuel tank cap delivers a perfect blend of heritage craftsmanship and contemporary performance, ensuring a seamless fit and long-lasting durability.

### Pros and Cons of Buying a Motorad SX-7R57 Fuel Tank Cap for a 1981 1985 Buick Century (4.3L, 5.7L V6, V8 Gas Injection Unit)

1. **Compatibility and Fit:** The Motorad SX-7R57 is specifically designed for Buick Century models from 1981 to 1985, including those with 4.3L, 5.7L V6, and V8 engines equipped with gas injection units (IU). This ensures a precise fit without modifications, reducing the risk of leaks or improper installation.

2. **Improved Fuel Efficiency:** The SX-7R57 is a high-performance fuel cap, often featuring a larger venting system or optimized airflow design. This can help reduce fuel vapor buildup in the tank, potentially improving fuel economy and engine performance.

3. **Durability and Quality:** Motorad products are generally known for their robust construction, using materials like reinforced plastic or metal components that resist corrosion and wear better than stock OEM caps, which may degrade over time.

4. **Prevents Fuel Evaporation:** Many high-performance fuel caps, including the SX-7R57, include a pressure-relief valve that minimizes fuel evaporation, keeping more gasoline in the tank for longer trips or extended periods of inactivity.

5. **Easy Installation:** Since it is a direct replacement, installing the SX-7R57 is straightforward no cutting, welding, or extensive modifications are required. It should drop into place just like the original cap.

6. **Compatibility with Aftermarket Upgrades:** If you plan to add performance modifications (e.g., cold air intake, ECU tuning, or high-flow fuel injectors), a high-quality fuel cap like this one ensures the system remains balanced and avoids potential issues like fuel starvation.

7. **Long-Term Reliability:** Stock fuel caps can crack or fail over time, especially in older vehicles. The SX-7R57 s reinforced design may offer better longevity, reducing the need for future replacements.

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1. **Cost:** The SX-7R57 is likely more expensive than a generic OEM replacement cap. While the price reflects its performance benefits, it may not be justified for someone who only needs a basic, functional replacement.

2. **Potential Overkill for Basic Use:** If your Buick Century is primarily driven for daily commuting with no performance modifications, the benefits of the SX-7R57 may be minimal. A standard OEM or aftermarket cap could suffice without the added cost.

3. **Limited Availability of Parts:** While Motorad is a reputable brand, parts like the SX-7R57 may not be as widely stocked as universal fuel caps. You might need to order it online or from a specialty performance parts dealer, which could add shipping time.

4. **Risk of Incompatibility with Modifications:** If your vehicle has been heavily modified (e.g., turbocharging, large fuel injectors, or aggressive tuning), the SX-7R57 might not be sufficient. In such cases, a more advanced fuel system upgrade (e.g., a high-flow fuel pump or larger tank venting) may be necessary.

5. **Installation Challenges:** While generally easy, if the fuel tank or surrounding area is corroded or damaged, installing the cap could require additional cleaning or repairs, adding time and effort to the process.

6. **No Significant Aesthetic Improvement:** Unlike some aftermarket parts, the SX-7R57 does not offer a visual upgrade. It functions the same as the stock cap but with performance enhancements, which may not appeal to those prioritizing appearance.

7. **Warranty or Return Issues:** If purchased from a third-party seller, there is a risk of receiving a counterfeit or damaged product. Always buy from authorized dealers or trusted online retailers to avoid this.

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The **Motorad SX-7R57 fuel tank cap** is an excellent choice for Buick Century owners (1981 1985) who prioritize **performance, fuel efficiency, and long-term reliability**. Its precise fit, durability, and venting improvements make it a worthwhile upgrade for those with modified or high-mileage vehicles. However, if your primary concern is a simple, cost-effective replacement for a stock cap, a standard OEM or budget aftermarket option may be sufficient.

For **daily drivers with minimal modifications**, the benefits may not outweigh the cost. For **enthusiasts, tuners, or those seeking to maintain optimal fuel system performance**, the SX-7R57 is a solid investment.

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- You have a modified or high-performance Buick Century.

- You notice fuel efficiency issues or suspect fuel vapor buildup.

- You want a durable, long-lasting replacement for your stock cap.

- You plan to add performance upgrades in the future.

- Your vehicle is used primarily for basic commuting with no modifications.

- You prefer a cheaper, no-frills solution.

- You cannot justify the additional cost for minimal perceived benefits.

For the best value, **purchase from an authorized Motorad dealer or a trusted online retailer** (e.g., Summit Racing, RockAuto, or eBay from verified sellers) to ensure authenticity and quality. Always verify compatibility with your specific engine configuration before buying.

Details:

MotoRad Fuel Tank Cap for 1981 - 1985 Buick Century 4.3L 5.7L V6 V8 Gas iu: Status: In Stock.

part #: sx7r57 price

• $14.98

specifications fueltanksysteme:

• for models: Century
• for makes: Buick
• for years: 1981-1985
• brand: Motorad
• mpn: Sx-7r57
• type: Fuel Tank Cap
• placement on vehicle: Air Fuel Delivery Hardware Fasteners Fittings
• item width: 3.000
• item length: 3.250
• manufacturer warranty: 1 Year
• ipn: C510 9-53
• compatible year: 1985 1984 1983 1982 1981
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Motorad Fuel Tank Cap

offer fueltanksysteme:

• availability: In Stock
• quantity: 10
• started: March 27, 2026
• sold: 0
• options: Ship-to-home

general fueltanksysteme:

• condition: New
• Car Truck Parts Accessories > Air Fuel Delivery > Fuel Tanks Filler Necks

seller fueltanksysteme:

• # reviews: 638270
• rating: 99.6%
• city: Indianapolis, Indiana

shipping fueltanksysteme:

• service: Standard, Expedited
• transit: 4-7 Days
• cost: $0.00
• class: Standard, Expedited
• type: Fixed

returns fueltanksysteme:

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

payments fueltanksysteme:

• other
• wallet: Paypal
• credit card: Diners-club

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