Genuine Motorcraft DY-207 Distributor Check Valve (NOS)
Restore the precise ignition timing and vacuum advance characteristics of your classic Ford powertrain with this genuine Motorcraft DY-207 Distributor Vacuum Check Valve. This authentic New Old Stock (NOS) component, also identified by Ford engineering number D7AZ-12A208-A, is a critical vacuum control device designed to delay or retain vacuum signal to the distributor advance unit. This valve is essential for ensuring smooth driveability, correct idle quality, and emissions compliance on a wide range of 1977-1983 vehicles, including the Ford LTD, Thunderbird, Granada, Fairmont, and Mustang; Mercury Marquis, Cougar, and Zephyr; and Lincoln Versailles and Continental models. Manufactured in the USA to original factory specifications, this vintage component provides the exact calibration required to maintain your engine's factory timing curve during a high-quality restoration.
Key Features:
- Brand: Motorcraft
- Part Number: DY-207
- OEM Number: D7AZ-12A208-A
- Interchange: D7AE-AA, D7AZ12A208A
- Position: Distributor Vacuum Line (Inline)
- Engine Fitment: Multiple V8 and I6 Configurations
- Origin: Made in USA
- Condition: New Old Stock (NOS)
Verified Vehicle Fitment:
| Make |
Model |
Year |
Engine |
Notes |
| Ford |
LTD / Thunderbird / Granada / Fairmont / Mustang |
1977-1983 |
All |
Distributor Spark Delay |
| Mercury |
Marquis / Cougar / Zephyr / Monarch |
1977-1983 |
All |
Distributor Spark Delay |
| Lincoln |
Versailles / Continental |
1977-1980 |
All |
Distributor Spark Delay |
Fits Years:
1977 1978 1979 1980 1981 1982 1983
Note on Stock Photos: Due to our inventory of multiple identical units for this specific part number, we utilize representative stock photos for this listing. You will receive a component that strictly meets all listed specifications and fitment requirements. Please be aware that because these are vintage parts, minor cosmetic variations—such as surface finish, color, or production markings—may exist between different manufacturing runs. These slight aesthetic differences are a result of historical production processes and do not impact the part's integrity, performance, or authenticity.
A Note on Fitment Accuracy: We manually research and cross-reference our fitment data using vintage manufacturer catalogs. While we strive for 100% accuracy, these decades-old resources—and the humans reading them—can occasionally contain errors. Additionally, these parts may fit other vehicles and years not explicitly listed in our data. To ensure a seamless restoration, we kindly ask that you perform your own due diligence and verify that this specific part number is correct for your application prior to purchase.
Unbeatable Prices & Expectations
While many of our vintage parts were manufactured decades ago, they remain unused and high-quality. Some original boxes may show signs of shelf-wear, such as dust, tape, or surface distress from years of storage. Rest assured, the components inside have been inspected to ensure they are complete and ready to help you finish your project without breaking the bank.
