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| Feature | Specification |
| Primary Part Number | MOTORCRAFT DY-207 |
| OEM Part Number | D7AZ-12A208-A (Ford/Motorcraft) |
| Function | Distributor Vacuum Decel Valve (Controls vacuum advance signal during deceleration to reduce engine emissions/backfiring) |
| Voltage | Not applicable (Mechanical/Vacuum component) |
| Ignition System | Used on vehicles equipped with DuraSpark II electronic ignition distributors. |
| Construction | Small Plastic/Metal Barrel with Vacuum Ports |
| Typical Use | Original Equipment (OE) Check Valve on the distributor vacuum line. |
| Vehicle/Truck | Years | Engine Type | Notes |
| Ford F-Series Trucks | 1977 - 1986 | V8 302, 351W, 400, 460 | Used in the vacuum advance line of the distributor. |
| Ford Bronco (Full Size) | 1977 - 1986 | V8 302, 351W, 400 | Used in the vacuum advance line of the distributor. |
| Ford Passenger Cars | 1977 - 1985 | V8 302, 351W, 400, 460 | Used in models like LTD, Galaxie, Thunderbird, and Mustang (V8). |
| Mercury/Lincoln | 1977 - 1985 | V8 302, 351W, 400, 460 | Used in models like Cougar, Marquis, and Continental using the DuraSpark system. |
