FORD D8BZ-9B289-B Nos Motorcraft Smog Pump Bypass Valve 291

( Manufacturer Part Number: D8BZ-9B289-B ), ( Part Type: Valve Pump ), ( Country Of Origin: United States )

Review FORD New Nos Motorcraft Smog Pump Bypass Valve Cx 291 D8bz 9b289 fits 1978

The **Ford D8BZ-9B289-B NOS Motorcraft Smog Pump Bypass Valve (Part #291)** is a meticulously preserved, high-quality aftermarket replacement designed to restore proper emissions functionality to vintage Ford engines equipped with the original smog pump system. This **new-old-stock (NOS) component** is crafted to exact specifications, ensuring a perfect fit and reliable performance in applications such as the **Ford 302, 351 Cleveland, and 351 Windsor engines** from the late 1970s, particularly those manufactured between **1975 and 1978** when California smog regulations were in full effect. Engineered with a **durable brass or stainless steel body**, the bypass valve is built to withstand the pressures of the engine s exhaust system while maintaining a tight seal, preventing leaks that could compromise emissions compliance or engine efficiency. The valve operates by allowing excess air to bypass the smog pump when necessary, reducing strain on the system and ensuring smooth operation under varying load conditions. Whether restoring a classic muscle car, a daily driver, or a high-performance street rod, this **genuine Motorcraft part** provides the authenticity and reliability expected from Ford s original equipment, making it an ideal choice for enthusiasts seeking both performance and compliance. Its **clean, unmodified condition** ensures it meets or exceeds the standards of the original, offering a seamless integration into any project where the smog pump bypass was either removed or degraded over time.

### Pros and Cons of Buying a Ford D8BZ-9B289-B NOS Motorcraft 1978 Smog Pump Bypass Valve (291 D8BZ 9B289)

1. **New Old Stock (NOS) Quality** The part is described as NOS, meaning it is new but has never been used, ensuring it is in pristine condition with no wear or damage. This can be preferable if you want a genuine, high-quality replacement without the risk of a used part failing prematurely.

2. **OEM Compatibility** The Motorcraft brand is Ford s official aftermarket parts division, meaning this valve is designed to fit and function exactly as the original equipment manufacturer (OEM) intended. This reduces the risk of compatibility issues with your 1978 Ford engine.

3. **Reliability** Since it is a genuine Ford part, it is built to the same standards as the original components installed in your vehicle. This can provide long-term reliability, especially if your vehicle is used for daily driving or performance applications.

4. **Ease of Installation** Being an OEM part, the valve should fit seamlessly into your engine s smog system without requiring modifications. This can save time and potential frustration during installation.

5. **Warranty Coverage** Motorcraft parts often come with a warranty, providing some level of protection against defects. This can offer peace of mind if the part fails shortly after installation.

6. **Preservation of Vehicle Value** Using OEM parts can help maintain or even increase the value of a classic or well-maintained vehicle, especially if you plan to sell it in the future. Buyers often prefer vehicles with original or high-quality aftermarket parts.

7. **No Guessing on Specifications** The part is clearly labeled and matches the specifications of the original valve, so you don t have to worry about whether it will meet emissions or performance requirements.

---

1. **Cost** NOS OEM parts are typically more expensive than aftermarket or used alternatives. If your budget is tight, this could be a significant drawback, especially if you need multiple parts for your vehicle.

2. **Limited Availability** NOS parts may not always be in stock, and ordering could take time, depending on the supplier. This could delay repairs or maintenance if you re working on a project with a tight timeline.

3. **Overkill for Some Applications** If your vehicle is not used frequently or is primarily for show, a NOS part might be unnecessary. In such cases, a used or aftermarket part that is still in good condition could suffice without the added cost.

4. **Potential for Counterfeit Parts** While rare, there is always a risk of purchasing counterfeit NOS parts, especially if buying from untrusted sellers. Always verify the authenticity of the part and the seller s reputation before purchasing.

5. **Storage and Handling** NOS parts are often stored in sealed packaging to preserve their condition. If the packaging is damaged or the part is mishandled during shipping, it could arrive damaged, rendering it unusable.

6. **Emissions Compliance Concerns** While the part is designed to meet original emissions standards, modern vehicles or areas with stricter emissions regulations might require additional modifications or parts. Ensure that this valve will comply with current regulations if your vehicle is being used in such areas.

7. **Resale Value Trade-off** If you re restoring a classic vehicle for resale, using NOS parts might not always yield the highest return on investment. Some buyers prefer a mix of OEM and aftermarket parts for cost savings, so this could impact your vehicle s appeal to certain buyers.

---

Buying a NOS Motorcraft 1978 smog pump bypass valve (D8BZ-9B289-B) is a solid choice if you prioritize quality, reliability, and compatibility with your Ford engine. The part s OEM status ensures it will fit and function correctly, and its new condition eliminates the risk of failure due to wear. However, the higher cost and potential availability issues may not make it the best option for everyone, particularly if you re on a budget or working on a project where cost savings are a priority.

If your primary goals are performance, longevity, or maintaining the integrity of your vehicle s original components, the NOS part is a worthwhile investment. Conversely, if you re looking to save money or restore a vehicle for resale, you might consider a high-quality aftermarket alternative or a used part that meets your needs.

---

- You value OEM quality and reliability above all else.

- Your vehicle is a daily driver or a performance project where original or high-quality parts are essential.

- You re willing to pay the premium for peace of mind and long-term durability.

- You ve verified the seller s reputation to ensure the part is authentic.

- You re working on a tight budget and can find a compatible aftermarket or used part that meets your needs.

- Your vehicle is primarily for show or occasional use, and you don t need the absolute best quality.

- You re restoring a classic car for resale and want to balance cost with appeal to potential buyers (a mix of OEM and aftermarket parts might be ideal).

Ultimately, weigh your priorities whether it s cost, quality, or convenience and make a decision that aligns with your project s goals. Always cross-reference the part number and specifications to ensure it s the correct fit for your engine.

Details:

Buyer pays for shipping.

part #: d8bz9b289 prices

• $166.25-$359.99

specifications emissyste:

• for makes: Ford
• for years: 1978
• mpn: D8bz-9b289-b
• part type: Valve Pump
• country of origin: United States

offer emissyste:

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

seller emissyste:

• # reviews: 5850
• city: Statham, Georgia
• rating: 99.6%

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 other see details

payments emissyste:

• other
• credit card: Diners-club
• wallet: Apple-pay

shipping emissyste:

• carrier: USPS
• class: Standard, Expedited
• type: Calculated
• transit: 5-11 Days
• cost: $14.00
• service: USPS Ground Advantage, USPS Priority Mail

Ford D8BZ-9B289 Is Similar To:

• 19002 Tomco Vapor Canister Purge Valve Ford (21.5% similar) E7TZ-9B963A. Once purchased you own it. Items are described to the best of my ability, but it is understood that all sold as, sales final. The applications are based on my research. Sometimes the manuals or internet sources make errors. Often part boxes and bags are opened for quality assurance ...(May 8th, 2018)
• 19004 Tomco Vapor Canister Purge Valve Ford Vans Pickup And Bronco (24.8% similar) ...(May 31st, 2018)
• 19007 Tomco Nos Vapor Canister Purge Valve Ford Lincoln Mercury Truck (29.5% similar) New tom co purge valve, ford logo on TOP1 18LOC bin 15 if you find it cheaper elsewhere, send me the item number and I will try to beat it,i be lowest price, is same item, in box...(August 6th, 2018)
• 19730022745 Ford Taurus Valve Hose Tube Pipe Connector Oem (27.6% similar) No exception. Kindly ask questions before offer ends...(June 23rd, 2018)
• 1c2z9f945aa Ford New Oem (18% similar) Ford oem F-150 2L-V6 emission-solenoid 1C2Z9F945AA new in the original ford box...(April 29th, 2018)
• 1l5z6a666ba Ford Brand New Oem Pcv Valve Ranger (29.9% similar) Note: for vehicles with engine size indicated below only manufacturer part number: 1L5Z6A666BA identified in schematic if applicable.: brand new oem PVC valve ford ranger 1L5Z-6A666-BA: brand that is a direct factory replacement for...(October 27th, 2018)
• 2132284 Ledkingdomus New Knock Sensor For Ford Thunderbird Lincoln 608631706492 (24.1% similar) 2L: features: 100 brand new and high quality. Stable characteristics, high reliability. Perfect to replace worn out or broken knock sensor. New knock sensor for ford Thunderbird E-250 F-150 Lincoln mark viii durable and undamaged. Easy to install...(March 12th, 2018)
• 2c2z-9d653-da Ford Motorcraft Vapor Canister Club Wagon 031508410169 (33.5% similar) ...(October 25th, 2018)
• 2m1029 Airtex Vapor Canister Purge Valve Fits Ford 080044656647 (24% similar) In order to prevent damage, some items may be shipped out-of-box ensure proper delivery. For over 40 years, Madison auto has been satisfying those needs consumers and mechanics alike...(March 5th, 2019)
• 2x4z6a666aa Motorcraft Pcv Valve Straight Angle Ford Lincoln Mercury Each (32.5% similar) Buyer pays return shipping. Fitment information may not be available for all products and those without will have a compatibility link. Grommet included no PVC angle straight quantity sold individually...(April 20th, 2018)
• 3f2z-6758-da Ford Freestar New Oem Pcv Hose Tube (25.2% similar) Or take a chance and make an offer. To Canada and USA. This is just a hobby for me but I still want to make people happy. Don't miss out...(January 9th, 2019)