FORD D2AZ-6505-B Exhaust Valve Nos

( Manufacturer Part Number: D2AZ-6505-B ), ( Part Type: Valve Exhaust )

Review FORD New Oem Exhaust Valve Nos fits 351 1969–1974

The **Ford D2AZ-6505-B Exhaust Valve** is a precision-engineered component designed specifically for the **1969 through 1974 351 cubic inch Cleveland (NOS) V8 engines**, a legendary powerplant renowned for its high-performance capabilities and durability. Crafted from high-grade **12% chromium stainless steel**, this valve is built to withstand the extreme heat and stress of high-performance applications, ensuring reliable operation under demanding conditions. The **D2AZ-6505-B** features a **1.940-inch stem diameter**, a dimension critical for maintaining proper valve-to-guide clearance and preventing premature wear, even in aggressive driving scenarios or modified engine setups. Its **tapered seat design** promotes optimal sealing, reducing blow-by and improving combustion efficiency, which is essential for maintaining peak power output and fuel economy. This valve is a direct replacement for the original equipment (OEM) part, ensuring an exact fit with the **351 Cleveland s** valve train, including the rocker arms and springs, without the need for modifications. Whether installed in a classic muscle car, a restored drag strip machine, or a modern high-performance build, the **D2AZ-6505-B** delivers the strength and performance expected from Ford s most iconic V8 configurations. Built to meet or exceed OEM specifications, this valve is a must-have upgrade for enthusiasts seeking to restore original performance or enhance the reliability of their Cleveland-powered vehicle.

### **Pros and Cons of buying a Ford D2AZ-6505-B Exhaust Valve (1969 1974 351 Cleveland/NOS)**

1. **OEM Quality and Reliability** Ford s D2AZ valves are designed as original equipment, meaning they meet strict manufacturing standards for durability and performance. They are built to handle the high temperatures and pressures of a 351 Cleveland engine, reducing the risk of premature failure.

2. **Direct Fitment** This valve is specifically engineered for the 1969 1974 351 Cleveland (non-SCJ) engines, ensuring a perfect match with the cylinder head. No modifications or adapters are typically required, making installation straightforward.

3. **Improved Engine Performance** Worn or leaking exhaust valves can cause power loss, poor combustion, and increased emissions. Replacing them with a new D2AZ valve restores proper sealing, improving horsepower, throttle response, and fuel efficiency.

4. **Prevents Further Damage** A failing exhaust valve can lead to catastrophic engine damage, such as blown head gaskets, piston damage, or even a cracked cylinder head. Replacing it proactively avoids costly repairs down the line.

5. **Compatibility with NOS (New Old Stock) Engines** If you re restoring or maintaining a high-performance 351 Cleveland, these valves are ideal for preserving or enhancing the engine s original specifications without compromising on quality.

6. **Easier to Source Than Aftermarket Alternatives** While aftermarket valves exist, finding a genuine Ford part can be more reliable in terms of fit and longevity, especially for collectors or enthusiasts who prioritize authenticity.

7. **Long-Term Cost Savings** Investing in a quality valve upfront can save money in the long run by avoiding repeated replacements or engine rebuilds due to valve-related issues.

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1. **Cost** As an OEM part, the D2AZ-6505-B valve is more expensive than many aftermarket alternatives. For budget-conscious buyers, this may be a significant upfront expense, especially if multiple valves or related components (like springs or seals) need replacement.

2. **Limited Availability** While not extremely rare, these valves may not be as widely stocked as common aftermarket parts. Sourcing them from a reputable Ford parts dealer or specialty engine supplier could require additional time or effort.

3. **Installation Complexity** Replacing exhaust valves requires removing the cylinder head, which is a labor-intensive job. Unless you have experience with engine disassembly, this may necessitate professional help, adding to the total cost.

4. **Potential for Counterfeit Parts** As with any OEM component, there is a risk of purchasing counterfeit or low-quality replicas, particularly from untrusted sellers. Always verify the source and authenticity of the part.

5. **Other Related Repairs May Be Needed** If the engine has been neglected, replacing just the valves may not be sufficient. You might also need to address:

- Worn valve seats

- Damaged valve guides

- Leaking head gaskets

- Cracked cylinder heads

These additional repairs could increase the overall cost and time required for restoration.

6. **Not a "Quick Fix" for All Issues** If the engine has severe internal wear (e.g., worn pistons, rod bearings, or crankshaft damage), replacing valves alone won t restore full performance. A comprehensive engine inspection is recommended before proceeding.

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The **Ford D2AZ-6505-B exhaust valve** is a high-quality, reliable choice for restoring or maintaining a 1969 1974 351 Cleveland engine, especially if you prioritize OEM specifications and long-term durability. It addresses critical performance and reliability issues while minimizing the risk of further engine damage. However, the cost, installation complexity, and potential need for additional repairs must be carefully considered.

If your primary goal is **restoring stock performance** or **preserving NOS integrity**, this valve is an excellent investment. If you re working with a **tight budget** or a **high-mileage engine with extensive wear**, weigh the cost against the potential need for broader repairs (e.g., head replacement, valve job, or full rebuild).

---

- You have a **well-maintained or restored 351 Cleveland** and want to ensure long-term reliability.

- You re willing to invest in **OEM quality** for performance and authenticity.

- You re prepared for the **labor-intensive installation** or have access to a trusted mechanic.

- You ve already addressed **related components** (seats, guides, head gaskets) to avoid future issues.

- You re on a **tight budget** and can find a **high-quality aftermarket valve** (e.g., from **Comp Cams, Crane, or Holley**) that meets your performance needs.

- Your engine has **significant internal wear** that would require a **full rebuild** regardless of valve replacement.

- You re restoring a **high-mileage engine** and want to prioritize **cost-effective repairs** before committing to OEM parts.

- **Inspect the cylinder head** for cracks or warping. A cracked head will require replacement, making valve replacement alone insufficient.

- **Check valve seats and guides** for wear. If they re damaged, they should be refurbished or replaced alongside the valves.

- **Verify the engine s condition** if it s running poorly due to other issues (e.g., fuel system, ignition, or internal wear), address those first.

- **Purchase from a reputable dealer** to avoid counterfeit parts. Look for sellers with positive reviews and clear documentation of the part s authenticity.

**Final Verdict:** For enthusiasts and collectors restoring a 351 Cleveland to stock or high-performance standards, the **D2AZ-6505-B valve is a strong, reliable choice**. For budget-conscious builders or those dealing with severely worn engines, a **thorough pre-purchase inspection** and consideration of aftermarket options may be more practical. Always prioritize **comprehensive engine health** over just replacing individual components.

Details:

If the original package is included it may show signs of wear. Pictures: Thumbnails. All parts are in stock and ready to ship. Items are shipped using USPS, UPS, and FedEx.

Exhaust Valve 1969-1974 351 is new and in excellent condition, original packaging. New OEM Ford D2AZ-6505-B Exhaust Valve 1969-1974 351 NOS.

part #: d2az6505 prices

• $11.66-$29.95

specifications emissyste:

• for models: 351
• for makes: Ford
• for years: 1969-1974
• mpn: D2az-6505-b
• part type: Valve Exhaust

seller emissyste:

• rating: 99.9%
• city: Ashaway, Rhode Island
• # reviews: 127303

payments emissyste:

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

offer emissyste:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• started: February 15, 2026
• quantity: 1
• best offers: True

shipping emissyste:

• cost: $0.00
• service: USPS Ground Advantage, USPS Priority Mail Flat Rate Envelope, UPS Next Day Air, UPS 2nd Day Air
• carrier: USPS, UPS
• type: Calculated
• transit: 5-10 Days
• class: Standard, Expedited, One-day

returns emissyste:

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

general emissyste:

• Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts
• condition: New

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